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BiH Engineering & Architecture Licensure Exam study materials
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BiH Engineering & Architecture Licensure Exam practice questions

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Question 1Professional Ethics, Legal Framework, and Practice Regulation

Under the Bosnia and Herzegovina engineering and architecture practice framework, which body is primarily responsible for regulating the professional conduct and licensing of engineers and architects at the entity level?

  1. The municipal building inspectorate of each local community
  2. The competent entity-level professional chamber or association empowered by entity law Correct answer.
  3. The entity ministry responsible for foreign trade policy
  4. The national competition authority for public procurement

Explanation

Professional licensing and discipline for engineers and architects in Bosnia and Herzegovina is organized at entity level through the competent professional chambers and associations established by entity legislation. Municipal bodies handle permits and inspections, not professional licensure.

Question 2Professional Ethics, Legal Framework, and Practice Regulation

A licensed architect is asked to sign off on a structural design prepared by an unlicensed person. What is the professionally correct course of action?

  1. Sign it only if the client accepts liability for any defects in writing
  2. Sign it after the unlicensed person verbally confirms the calculations are correct
  3. Sign it and note the unlicensed author in a separate private file
  4. Refuse to sign and require that the design be prepared and certified by a licensed professional Correct answer.

Explanation

A licensed professional may only stamp and take responsibility for work they have actually prepared or directly supervised. Certifying another unlicensed person's design misrepresents responsibility and endangers public safety. The client's consent cannot cure the professional breach.

Question 3Professional Ethics, Legal Framework, and Practice Regulation

Which statement best describes the role of a professional code of ethics for engineers and architects in Bosnia and Herzegovina?

  1. It applies only to engineers employed in the public sector
  2. It is a voluntary marketing guideline with no disciplinary consequences
  3. It replaces all statutory obligations with general moral advice
  4. It sets binding standards of conduct, integrity, and public safety that members must follow Correct answer.

Explanation

A professional code of ethics establishes enforceable standards of conduct, including duties to the public, clients, and the profession. Breach of the code can lead to disciplinary measures by the competent chamber. It supplements rather than replaces statutory duties.

Question 4Professional Ethics, Legal Framework, and Practice Regulation

An engineer discovers a serious safety defect in a building already occupied by residents. According to professional ethics, what should the engineer do first?

  1. Keep the finding confidential to protect the client's commercial interests
  2. Notify the client and the competent inspection authority promptly so that protective measures can be taken Correct answer.
  3. Publish the finding on social media before informing anyone involved
  4. Wait for the next scheduled annual review before reporting

Explanation

The paramount ethical duty is protection of public safety, health, and life. When a serious defect threatens occupants, the engineer must promptly inform the client and the competent authority so protective action can begin. Confidentiality yields to this overriding public interest.

Question 5Professional Ethics, Legal Framework, and Practice Regulation

In the context of professional practice regulation, what does continuing professional development (CPD) typically require of licensed engineers and architects?

  1. Periodic participation in structured learning activities to maintain and update professional competence Correct answer.
  2. Completion of a single training course taken only at the time of initial licensure
  3. Attendance at social events organized by the chamber
  4. Submission of annual financial statements to the chamber

Explanation

Continuing professional development is an ongoing obligation to maintain and update competence throughout a career. It is generally documented over recurring cycles, not satisfied once at licensure. Social events and financial reporting are not CPD.

Question 6Professional Ethics, Legal Framework, and Practice Regulation

Which of the following best describes the ethical principle of competence in engineering and architectural practice?

  1. Professionals should accept every project offered to expand their market share
  2. Professionals should delegate all technical decisions to contractors
  3. Professionals should rely on the client to verify technical adequacy
  4. Professionals should undertake only work within their qualifications or obtain appropriate expert support Correct answer.

Explanation

The competence principle requires practitioners to limit their engagement to services they are qualified to perform, or to engage qualified specialists. Accepting work beyond one's expertise endangers quality and public safety. Responsibility for technical adequacy cannot be shifted to clients or contractors.

Question 7Professional Ethics, Legal Framework, and Practice Regulation

An architect is offered a commission and the client proposes paying a percentage of the fee to a municipal official who will expedite the building permit. How should the architect respond?

  1. Accept it as a normal local practice for expediting permits
  2. Accept it if the payment is documented as a consulting fee
  3. Refuse the arrangement because facilitating improper influence is incompatible with professional integrity Correct answer.
  4. Accept it only if the official is a relative of the client

Explanation

Offering or agreeing to improper payments to public officials to obtain favourable treatment is corruption and violates professional integrity and the law. The label given to the payment does not change its character. Personal relationships do not legitimize it either.

Question 8Professional Ethics, Legal Framework, and Practice Regulation

A client asks an engineer to keep a design change secret from the co-investor who co-finances the project. The change affects cost and structural performance. What is the appropriate professional response?

  1. Comply only until the next payment is received
  2. Decline to conceal material information and advise that affected parties be informed Correct answer.
  3. Comply fully and record the concealment in the project file
  4. Comply but reduce the design fee to offset the risk

Explanation

Engineers owe honesty to all parties with a legitimate interest in the project and must not participate in concealing material facts. Concealment of cost and performance changes can mislead co-investors and expose the engineer to liability. The professional should insist on transparent disclosure.

Question 9Professional Ethics, Legal Framework, and Practice Regulation

When a licensed engineer signs and seals technical documentation, what does this act primarily signify?

  1. That the client has accepted all project risks
  2. That the professional takes responsibility for the document's technical adequacy and compliance Correct answer.
  3. That the document has been approved by the municipal council
  4. That the contractor guarantees the work at no cost

Explanation

Signing and sealing is a professional certification that the work meets applicable standards and that the signer assumes responsibility for it. It is not a political or municipal approval, nor does it shift risk to the client or contractor. The seal identifies who is accountable.

Question 10Professional Ethics, Legal Framework, and Practice Regulation

An engineer leaves one firm and joins a competing practice. Which conduct is consistent with professional ethics regarding the former employer's information?

  1. Taking client databases and internal cost models to the new employer
  2. Respecting confidentiality of the former employer's proprietary and client information Correct answer.
  3. Disclosing the former employer's bidding strategy to the new firm
  4. Soliciting the former employer's clients using confidential contact lists

Explanation

Confidentiality obligations survive the end of an engagement or employment relationship. Proprietary data, client lists, and bidding strategies acquired in confidence may not be used or disclosed for a new employer's benefit. Loyalty to the new firm does not license misuse of confidential information.

Question 11Professional Ethics, Legal Framework, and Practice Regulation

What is the primary purpose of professional liability insurance for engineers and architects?

  1. To guarantee that no design errors will ever occur
  2. To exempt the professional from disciplinary proceedings
  3. To replace the need for building permits
  4. To protect the professional and injured parties against financial loss from negligent professional services Correct answer.

Explanation

Professional indemnity insurance provides a financial backstop for claims arising from errors, omissions, or negligence in professional services. It does not eliminate liability, prevent errors, or affect disciplinary or administrative procedures. Its function is compensation, not immunity.

Question 12Professional Ethics, Legal Framework, and Practice Regulation

An engineer is asked to review a project designed by a colleague and finds significant deficiencies. How should the review be conducted ethically?

  1. Publicly criticize the colleague's competence at a trade event
  2. Refuse to review any work by another professional
  3. Approve the design to avoid conflict with the colleague
  4. Report the findings objectively through proper channels and give the colleague an opportunity to respond Correct answer.

Explanation

Peer review must be objective, factual, and conducted through appropriate professional channels. The reviewed professional should have an opportunity to respond before conclusions are finalized. Public attacks and avoidance both undermine the profession's integrity.

Question 13Professional Ethics, Legal Framework, and Practice Regulation

A developer pressures an architect to reduce structural safety margins to cut costs below the level required by technical regulations. What is the architect's correct position?

  1. Accept the reduction if the contractor agrees in writing
  2. Insist on compliance with mandatory technical norms regardless of cost pressure Correct answer.
  3. Accept the reduction because the developer bears commercial risk
  4. Accept the reduction if the building is only temporary

Explanation

Mandatory technical regulations set minimum safety requirements that cannot be bargained away for cost savings. The designer's duty to public safety overrides commercial pressure. Neither the developer's risk appetite nor contractor consent can justify non-compliant design.

Question 14Professional Ethics, Legal Framework, and Practice Regulation

Which practice is consistent with the ethical duty of fairness in professional relationships with contractors?

  1. Sharing one bidder's pricing with a competing bidder
  2. Evaluating contractor work against the same objective criteria applied to all bidders Correct answer.
  3. Favouring a contractor who offers personal benefits to the engineer
  4. Withholding payment for completed compliant work to gain leverage

Explanation

Fairness requires consistent, objective evaluation of all parties and transparency in dealings. Personal benefits, improper payment withholding, and leaking pricing information all distort fair competition. Uniform criteria protect both the client and the integrity of the process.

Question 15Professional Ethics, Legal Framework, and Practice Regulation

An engineer is asked to provide expert testimony in a dispute about a collapsed structure. Which approach best reflects professional ethics?

  1. Refuse to disclose any calculations relied upon
  2. Present technically sound opinions based on evidence, even if they favour the opposing party Correct answer.
  3. Exaggerate certainty to strengthen the retaining party's case
  4. Tailor conclusions to whatever the retaining party wants to hear

Explanation

An expert owes a duty of objectivity to the tribunal and the truth, not loyalty to the party paying the fee. Opinions must be grounded in evidence and technically defensible. Concealing the basis of an opinion or overstating certainty misleads decision-makers.

Question 16Professional Ethics, Legal Framework, and Practice Regulation

What is the difference between a professional licence and membership in a professional chamber in the Bosnia and Herzegovina framework?

  1. The licence is optional while chamber membership is mandatory for all citizens
  2. They are identical and interchangeable in every respect
  3. The licence authorizes practice, while chamber membership organizes the profession and supports regulation Correct answer.
  4. Chamber membership replaces the need for any licence to practise

Explanation

The licence is the legal authorization to perform professional work, while the chamber is the organizational body that represents members and supports regulation and discipline. The two are related but serve distinct functions. Neither substitutes for the other.

Question 17Professional Ethics, Legal Framework, and Practice Regulation

An architect learns that a colleague has been signing documents for work the colleague never reviewed. What is the most appropriate ethical response?

  1. Confront the colleague publicly on a professional forum
  2. Raise the matter through the competent professional body so it can be properly examined Correct answer.
  3. Threaten the colleague with private financial demands to stop
  4. Ignore the conduct because it does not affect the architect's own projects

Explanation

Serious misconduct affecting public safety and professional integrity should be reported to the competent professional body, which has the authority to investigate. Public confrontation and private threats are inappropriate and may themselves be unethical. Inaction permits ongoing risk.

Question 18Professional Ethics, Legal Framework, and Practice Regulation

A firm is offered a public project and the tender documents require a bid bond and proof of technical capacity. The firm lacks part of the required capacity. What is the professionally correct approach?

  1. Decline to bid alone and instead form a lawful joint arrangement or refrain from bidding Correct answer.
  2. Submit a false capacity certificate to meet the threshold
  3. Submit the bid and promise to acquire the capacity after award
  4. Ask a municipal official to waive the requirement informally

Explanation

Bidders must demonstrate genuine compliance with qualification requirements at submission. Lawful alternatives include forming a consortium or joint venture that collectively meets the criteria. Misrepresenting capacity or seeking informal waivers undermines the integrity of public procurement.

Question 19Professional Ethics, Legal Framework, and Practice Regulation

Two provisions appear to conflict: a confidentiality clause in the client contract and the engineer's statutory duty to report a hazard to authorities. How should the engineer resolve the conflict?

  1. Resign from the project and take no further action
  2. Always follow the contract clause because contracts override statutes
  3. Disclose everything to the public immediately without notifying anyone
  4. Follow the statutory public-safety duty, disclosing only what is necessary to the competent authority Correct answer.

Explanation

Statutory duties protecting public safety prevail over private contractual confidentiality obligations. The engineer should report to the competent authority and limit disclosure to what is necessary to address the hazard. Resigning without action leaves the danger unaddressed.

Question 20Professional Ethics, Legal Framework, and Practice Regulation

A licensed engineer is asked to certify a completed phase of works that the engineer has not inspected, relying only on the contractor's photographs. What is the correct professional judgment?

  1. Certify the phase because photographs are generally sufficient evidence
  2. Decline to certify until adequate verification, such as inspection or independent testing, is carried out Correct answer.
  3. Certify the phase and note the limitation only in an internal memo
  4. Certify the phase if the contractor accepts responsibility for defects

Explanation

Certification asserts that the works conform to the design and applicable standards, which requires adequate verification by the certifying professional. Photographs supplied by the executing party are not sufficient evidence of conformity. Responsibility for the certificate cannot be transferred to the contractor.

Question 21Structural Analysis and Design

In the limit-state design of a reinforced concrete beam, which combination represents the fundamental ultimate limit state for a persistent design situation?

  1. 1.00 permanent load plus 1.00 variable load
  2. 1.00 permanent load plus 0.30 variable load
  3. 0.90 permanent load plus 1.50 variable load
  4. 1.35 permanent load plus 1.50 variable load Correct answer.

Explanation

For persistent and transient design situations, EN 1990 gives the fundamental combination with partial factors of 1.35 on permanent actions and 1.50 on the leading variable action, with combination factors applied to accompanying variable actions. This combination governs the ultimate limit state for strength verification. Serviceability checks instead use characteristic or quasi-permanent values.

Question 22Structural Analysis and Design

A simply supported beam of span 6 m carries a uniformly distributed load of 10 kN/m over its full length. What is the maximum bending moment?

  1. 30 kNm
  2. 90 kNm
  3. 60 kNm
  4. 45 kNm Correct answer.

Explanation

The maximum moment for a simply supported beam under a uniform load is wL squared divided by eight. With w equal to 10 kN/m and L equal to 6 m, the moment equals 10 times 36 divided by 8, giving 45 kNm at midspan.

Question 23Structural Analysis and Design

Which quantity is obtained directly from the area under the shear force diagram of a beam?

  1. Change in bending moment between two sections Correct answer.
  2. Deflection at midspan
  3. Change in axial force between two sections
  4. Slope of the elastic curve

Explanation

The shear force is the first derivative of bending moment with respect to position, so integrating shear over a length yields the change in moment across that length. The area under the shear diagram therefore equals the moment difference between the two sections considered.

Question 24Structural Analysis and Design

In a statically determinate plane truss with j joints, m members, and r reaction components, which condition must hold for the truss to be internally and externally determinate?

  1. m plus r is less than 2j
  2. m equals j
  3. m plus r equals 2j Correct answer.
  4. m plus r is greater than 2j

Explanation

Each joint provides two independent equilibrium equations in a plane truss, giving 2j equations in total. The unknowns are the m member forces plus r reaction components, so determinacy requires m plus r to equal 2j. A greater value indicates redundancy and a smaller value indicates instability.

Question 25Structural Analysis and Design

Which structural property describes a section's resistance to torsional warping in an open thin-walled member?

  1. Plastic section modulus
  2. Warping constant Correct answer.
  3. Torsion constant
  4. Second moment of area

Explanation

The warping constant, often denoted by a subscript w, measures resistance to non-uniform torsion in which cross-sections warp out of plane. Open thin-walled sections have low St Venant torsion stiffness, so warping resistance often dominates. The torsion constant instead relates to uniform St Venant torsion.

Question 26Structural Analysis and Design

What is the primary purpose of providing a minimum percentage of longitudinal reinforcement in a reinforced concrete beam?

  1. To increase the shear capacity of the web
  2. To control cracking and prevent brittle failure after cracking Correct answer.
  3. To reduce the self-weight of the member
  4. To improve the fire resistance rating

Explanation

Minimum longitudinal steel ensures that the cracked section can carry the moment that caused first cracking without a sudden brittle failure. It also distributes cracking and provides ductility. Without it, a lightly reinforced beam may fail abruptly at first cracking.

Question 27Structural Analysis and Design

In structural steel design, which term denotes the ratio of the yield strength to the ultimate tensile strength of a material?

  1. Ductility index
  2. Poisson ratio
  3. Strain-hardening ratio
  4. Yield ratio Correct answer.

Explanation

The yield ratio is the yield strength divided by the ultimate tensile strength. A low yield ratio indicates a long yield plateau and good ductility and energy absorption before fracture. Codes often limit this ratio for seismic-resistant steel.

Question 28Structural Analysis and Design

A cantilever of length 3 m carries a point load of 20 kN at its free end. What is the magnitude of the fixed-end bending moment?

  1. 120 kNm
  2. 60 kNm Correct answer.
  3. 20 kNm
  4. 30 kNm

Explanation

For a cantilever with an end point load, the fixed-end moment equals the load multiplied by the cantilever length. Here 20 kN times 3 m gives 60 kNm, acting hogging at the support.

Question 29Structural Analysis and Design

A simply supported beam of span 8 m carries a central point load of 40 kN. What is the maximum deflection if EI equals 20000 kNm squared?

  1. 8 mm
  2. 32 mm
  3. 4 mm
  4. 16 mm Correct answer.

Explanation

The midspan deflection for a central point load is PL cubed divided by 48EI. Substituting 40 kN, 8 m, and 20000 kNm squared gives 40 times 512 divided by 960000, which equals 0.0213 m, or about 16 mm after rounding to the nearest whole value.

Question 30Structural Analysis and Design

A propped cantilever of constant EI has a uniformly distributed load over its full length. How many redundants must be released to analyse it by the force method?

  1. One Correct answer.
  2. Zero
  3. Two
  4. Three

Explanation

A propped cantilever has one fixed support with three reaction components and one roller with one component, giving four unknowns against three equilibrium equations. The degree of static indeterminacy is therefore one, so a single redundant must be chosen.

Question 31Structural Analysis and Design

In the slope-deflection method, the fixed-end moment at each end of a member carrying a uniformly distributed load of magnitude w over span L has what magnitude?

  1. wL squared divided by twelve Correct answer.
  2. wL squared divided by twenty-four
  3. wL squared divided by four
  4. wL squared divided by eight

Explanation

A prismatic member with both ends fixed under a uniform load develops fixed-end moments of wL squared divided by twelve at each end, with opposite signs. These values are the starting point for the slope-deflection equations before joint rotations and sway are considered.

Question 32Structural Analysis and Design

A rectangular reinforced concrete section has a width of 300 mm and an effective depth of 500 mm. Using a concrete design compressive strength of 20 MPa and a steel design strength of 435 MPa, what is the approximate balanced reinforcement ratio?

  1. About 0.080
  2. About 0.040
  3. About 0.010
  4. About 0.020 Correct answer.

Explanation

The balanced ratio follows from strain compatibility, approximately 0.8 times the concrete strength times the block factor divided by the steel strength, multiplied by the ratio of the balanced neutral axis depth to the effective depth. With a concrete strength of 20 MPa and steel strength of 435 MPa, the result is close to 0.020.

Question 33Structural Analysis and Design

In a reinforced concrete beam, why are shear stirrups spaced more closely near the supports than at midspan?

  1. Bending moment is highest near the supports
  2. Concrete cover requirements are stricter near supports
  3. Shear demand is highest near the supports and decreases toward midspan Correct answer.
  4. Longitudinal bars require more lateral restraint at midspan

Explanation

In a simply supported beam the shear force is greatest at the supports and reduces toward midspan, so the required shear reinforcement per unit length is highest there. Closer stirrup spacing near supports provides the additional resistance needed. Bending moment follows the opposite pattern.

Question 34Structural Analysis and Design

Which statement correctly describes the behaviour of a short reinforced concrete column under an axial load combined with a small eccentricity?

  1. The column behaves as a pure beam with no axial compression
  2. The section is tension-controlled and the steel yields in tension
  3. The section is typically compression-controlled and the steel may yield in compression Correct answer.
  4. Failure is always governed by shear

Explanation

When the eccentricity is small, the neutral axis lies deep in the section and the entire concrete area remains largely in compression. The section is compression-controlled, and both concrete and compression steel may reach their design strengths before the tension steel yields.

Question 35Structural Analysis and Design

In structural steel design, what does the classification of a cross-section as class 1 (plastic) indicate?

  1. It buckles locally before reaching yield
  2. It can reach its yield moment but cannot develop a plastic hinge
  3. It can form a plastic hinge with sufficient rotation capacity for plastic analysis Correct answer.
  4. It is suitable only for compression members

Explanation

Class 1 sections have sufficiently stocky webs and flanges to reach their plastic moment and rotate without local buckling. This rotation capacity allows plastic hinge formation and global plastic analysis. Class 2 sections reach the plastic moment but have limited rotation capacity.

Question 36Structural Analysis and Design

What is the main reason for providing a shear connection between a steel beam and a concrete slab in a composite floor system?

  1. To eliminate the need for shear studs
  2. To reduce the fire protection thickness on the steel
  3. To prevent thermal expansion of the slab
  4. To transfer longitudinal shear so the two components act as a single composite section Correct answer.

Explanation

Shear connectors transfer the longitudinal interface shear between the steel beam and the concrete slab. This enables the two components to act together, greatly increasing flexural stiffness and moment capacity compared with the bare steel beam.

Question 37Structural Analysis and Design

A beam is loaded such that the shear force diagram crosses zero at a point. What does this indicate about the bending moment diagram?

  1. The bending moment is zero at that point
  2. The bending moment changes sign at that point
  3. The bending moment diagram has a point of contraflexure there
  4. The bending moment reaches a local maximum or minimum at that point Correct answer.

Explanation

Because shear is the derivative of moment, a zero shear value means the moment gradient is zero, so the moment curve has a turning point. This corresponds to a local maximum or minimum of bending moment, typically where the largest moment occurs.

Question 38Structural Analysis and Design

In the moment-distribution method, what is the distribution factor for a member end at a joint?

  1. Its stiffness divided by the sum of the stiffnesses of all members meeting at the joint Correct answer.
  2. The carry-over factor multiplied by the fixed-end moment
  3. One divided by the number of members meeting at the joint
  4. The sum of the stiffnesses of all members divided by its stiffness

Explanation

The distribution factor is the rotational stiffness of the member relative to the total rotational stiffness of all members framing into the joint. The factors at a joint sum to unity, so the unbalanced moment is shared in proportion to member stiffness.

Question 39Structural Analysis and Design

Which phenomenon occurs when a thin-walled steel plate is subjected to in-plane compression and buckles before reaching yield?

  1. Local buckling Correct answer.
  2. Overall flexural buckling
  3. Lateral-torsional buckling
  4. Yielding

Explanation

Local buckling is the out-of-plane deformation of a plate element within the cross-section under in-plane compression. It occurs when the plate slenderness exceeds a limiting value and reduces the effective resistance of the section.

Question 40Structural Analysis and Design

In the design of a reinforced concrete pad footing, why is punching shear checked at the critical perimeter around the column?

  1. To limit the bearing pressure on the soil beneath the footing
  2. To ensure adequate development length of the column bars
  3. To control the flexural cracking at the top of the footing
  4. To prevent the column from punching through the footing thickness Correct answer.

Explanation

Punching shear is a concentrated failure mode in which the column tends to push a truncated cone of concrete through the footing. The check at the critical perimeter verifies that the concrete and any shear reinforcement can resist the concentrated reaction.

Question 41Structural Analysis and Design

A two-hinged parabolic arch spans 40 m and carries a uniformly distributed load of 10 kN/m along the horizontal. If the rise is 8 m, what is the approximate horizontal thrust at each support?

  1. 250 kN Correct answer.
  2. 125 kN
  3. 1000 kN
  4. 500 kN

Explanation

For a two-hinged parabolic arch under uniform horizontal load, the horizontal thrust equals wL squared divided by eight times the rise. Substituting 10 kN/m, 40 m, and 8 m gives 16000 divided by 64, which equals 250 kN.

Question 42Structural Analysis and Design

A portal frame with fixed bases has a horizontal sway displacement at the top of the columns. Using the slope-deflection method, which relationship correctly expresses the chord rotation of a column of height h?

  1. Chord rotation equals the sway displacement divided by the column height Correct answer.
  2. Chord rotation equals twice the sway displacement divided by the height
  3. Chord rotation equals the sway displacement multiplied by the column height
  4. Chord rotation equals zero because the bases are fixed

Explanation

The chord rotation is the angle between the chord connecting the two member ends and the original undeformed axis. For a column of height h with a relative lateral displacement, the chord rotation is the displacement divided by the height. This term enters the slope-deflection equations and drives the sway analysis.

Question 43Structural Analysis and Design

In plastic analysis of a fixed-base rectangular portal frame under a single horizontal load at the beam level, how many independent plastic hinges are required to form a collapse mechanism?

  1. Three Correct answer.
  2. One
  3. Four
  4. Two

Explanation

A fixed-base portal frame has a degree of static indeterminacy of three, so three independent plastic hinges are needed to create a mechanism. A typical sway mechanism forms hinges at both column bases and at one beam-to-column joint.

Question 44Structural Analysis and Design

A steel column of effective length 4 m has a second moment of area of 8000 cm to the fourth power and E equal to 210000 MPa. What is the approximate Euler buckling load?

  1. About 1040 kN Correct answer.
  2. About 520 kN
  3. About 260 kN
  4. About 2080 kN

Explanation

The Euler load is pi squared times EI divided by the effective length squared. Converting the second moment of area to 8 times 10 to the minus five m to the fourth power and the length to 4 m gives approximately 1040 kN. This assumes elastic buckling and pin-ended conditions.

Question 45Structural Analysis and Design

In the design of a reinforced concrete retaining wall, which condition governs the stability check against overturning?

  1. The passive resistance of the soil in front of the wall must exceed the active thrust
  2. The total vertical load must exceed the total horizontal load
  3. The ratio of restoring moment to overturning moment about the toe must exceed a specified factor Correct answer.
  4. The base width must exceed the wall height

Explanation

Overturning stability is assessed by taking moments about the toe of the wall. The resisting moment from the wall and soil weight must exceed the overturning moment from the lateral earth pressure by a required factor of safety. Sliding and bearing are checked separately.

Question 46Structural Analysis and Design

In the design of a reinforced concrete beam, what is the primary function of shear reinforcement (stirrups)?

  1. To increase the flexural capacity of the beam
  2. To resist diagonal tension cracking and prevent brittle shear failure Correct answer.
  3. To reduce the deflection under service loads
  4. To confine the concrete and improve ductility in flexure

Explanation

Shear reinforcement is provided to resist the diagonal tension stresses that develop in a concrete beam under shear forces. Without adequate shear reinforcement, the beam may fail in a brittle manner along a diagonal crack. Stirrups also help confine the concrete and improve ductility, but their primary role is shear resistance.

Question 47Structural Analysis and Design

In structural steel design, what does a ductile failure mode refer to?

  1. Failure caused by buckling of thin elements
  2. Failure that occurs after significant plastic deformation, providing warning Correct answer.
  3. Failure that occurs suddenly without warning
  4. Failure due to fatigue under repeated loading

Explanation

A ductile failure mode is one in which the material undergoes substantial plastic deformation before fracture, giving visible warning and allowing redistribution of forces. This is desirable in design because it prevents sudden, catastrophic collapse. Brittle failure, by contrast, occurs with little or no plastic deformation.

Question 48Structural Analysis and Design

A simply supported beam of span 6 m carries a uniformly distributed load of 10 kN/m over its entire length. What is the maximum bending moment?

  1. 90 kN·m
  2. 22.5 kN·m
  3. 45 kN·m Correct answer.
  4. 60 kN·m

Explanation

For a simply supported beam with a uniformly distributed load w over span L, the maximum bending moment is wL²/8. Here w = 10 kN/m and L = 6 m, so M = 10 × 6² / 8 = 360 / 8 = 45 kN·m. This maximum occurs at midspan.

Question 49Structural Analysis and Design

A short reinforced concrete column is subjected to a factored axial load of 2000 kN and a factored moment of 150 kN·m about one axis. The column has a cross-section of 400 mm × 400 mm and is reinforced with 4 bars of 20 mm diameter. Which statement best describes the design approach for this column?

  1. Design the column for axial load only and provide minimum reinforcement.
  2. Ignore the moment because the axial load is high.
  3. Design the column as a short column using a interaction diagram for combined axial load and bending. Correct answer.
  4. Design the column as a slender column and include second-order effects.

Explanation

For a short column, second-order effects are negligible, and the design is based on the interaction between axial load and bending moment. An interaction diagram or a simplified design method is used to ensure the section can resist the combined actions. The slenderness ratio should be checked to confirm the column qualifies as short.

Question 50Structural Analysis and Design

A steel beam is simply supported and carries a uniformly distributed load. The beam is laterally restrained at intervals along its compression flange. Which factor most directly determines whether lateral-torsional buckling must be considered?

  1. The yield strength of the steel
  2. The moment of inertia about the strong axis
  3. The unbraced length between lateral restraints Correct answer.
  4. The span-to-depth ratio of the beam

Explanation

Lateral-torsional buckling occurs when the compression flange of a beam buckles sideways between points of lateral restraint. The unbraced length is the critical parameter; if it is small enough, the beam is fully restrained and buckling is prevented. Other factors like yield strength and section properties influence capacity but the need to check buckling is governed by the unbraced length.