Technical engineering competence and design application
Technical engineering competence and design application
This domain tests whether you can apply engineering fundamentals safely: define design inputs, select standards, calculate, verify, check interfaces and produce buildable, testable designs. Questions often require a short calculation or a judgement about whether a design is adequately evidenced.
Core rules and concepts
- Establish design basis: function, loads or actions, environmental conditions, materials, tolerances, interfaces and applicable standards.
- Distinguish characteristic values from design values. Apply the partial factors or safety factors required by the governing code, and state the code edition.
- Keep calculations traceable: assumptions, units, references, software inputs and outputs, checks and reviewer.
- Verify by independent check, hand calculation, testing or comparison. Software output is not a check by itself.
- Design for constructability, maintenance, testing and commissioning. Specify acceptance criteria and as-built records.
- Check serviceability and failure modes, not only strength.
Worked example
A slab strip carries a dead load of 20 kN/m and an imposed load of 10 kN/m. Using the project’s load combination 1.4D + 1.6L, the design action is (1.4 × 20) + (1.6 × 10) = 28 + 16 = 44 kN/m. The proposed section has a verified resistance of 50 kN/m. Utilisation is 44/50 = 0.88, or 88%, so strength passes with a 12% margin. Reasoning continues: confirm the code, check deflection, cracking, detailing and construction tolerances; do not stop at the strength ratio.
Traps
Mixing characteristic and design loads; unit errors; accepting black-box software; omitting serviceability; and specifying details that cannot be built or inspected.