ICC S1 Structural Steel and Bolting common mistakes
ICC S1 Structural Steel and Bolting · Understand the traps and how to avoid them.
Answering that the special inspector reviews and approves shop drawings and resolves design conflicts found in the field.
The inspector is the person who sees every detail on site, so role boundaries blur under exam pressure; candidates default to 'the inspector checks everything.'
What to do instead
Memorize the IBC Chapter 17 / AISC 303 role split: the EOR (or designated representative) approves shop drawings and resolves design issues; the special inspector observes and reports conformance to the approved drawings, and has no authority to approve changes.
Treating a connection as bearing-type with snug-tight bolts simply because the drawings carry no bolt pretension note, rather than flagging the omission.
Candidates assume a default installation method exists, so a silent drawing looks complete.
What to do instead
Know that structural drawings must state bolt grade, diameter, hole type and whether connections are snug-tight, pretensioned or slip-critical (AISC 360 §M / RCSC). A silent drawing is a plans-review finding, not a default - answer 'issue an RFI.'
Accepting ASTM A307 or A449 bolts, or unmarked bolts, as interchangeable with ASTM F3125 Grade A325/A490 high-strength bolts.
Older nomenclature (A325/A490 vs. the F3125 consolidation) and similar-looking head markings make grades easy to confuse under time pressure.
What to do instead
Learn the F3125 consolidation (Gr. A325, A490, F1852, A325M, A490M), the required head and nut markings, and that A307 is a low-strength bolt not permitted for pretensioned/slip-critical work. Verify grade against mill certificates and markings, not the shipping label.
Stating that fabrication may begin as soon as the fabricator's own quality-control manager signs off on the shop drawings.
Shop-drawing review is often taught as a documentation step, so internal QC approval feels sufficient.
What to do instead
Remember fabrication cannot start until shop drawings are approved by the EOR or the EOR's designated representative (AISC 360 §M / Code of Standard Practice). Internal QC sign-off is not approval.
Selecting a 1/2-turn nut rotation for every turn-of-nut pretensioned bolt regardless of bolt length or diameter.
The half-turn rule is the most widely remembered number, so it is applied without checking the length-to-diameter condition that governs rotation.
What to do instead
Memorize the RCSC turn-of-nut rotation table: rotations vary (roughly 1/3, 1/2, 2/3 turn) with bolt length and diameter, and turn-of-nut is only permitted when the specified rotation can be reliably applied. Match the specific bolt length in the question to the correct rotation.
Assuming a welder's passed performance qualification test also qualifies the welding procedure specification.
Both are 'qualification' documents signed by the same people, so the two are merged mentally.
What to do instead
Keep the two tracks separate in your head: WPS qualification (procedure qualification by prequalification under AWS D1.1 Clause 3 or by testing under Clause 4) is independent of welder performance qualification (Clause 5). A qualified welder using an unqualified WPS is still nonconforming.
Accepting field bending of anchor rods, flame cutting of base plates, or enlarging holes to correct misfit during erection.
Field fixes look pragmatic, and the question frames them as 'resolving an alignment problem' so the shortcut seems reasonable.
What to do instead
Hold the line that field modifications to structural members and anchor rods require EOR approval (AISC 303 §7); anchor rods may not be bent, cut or heated without it. Know the erection tolerances for plumbness and elevation and that exceeding them is an RFI, not a field fix.
Answering that 100% ultrasonic testing is required on all complete-joint-penetration welds by default.
Candidates over-generalize from a single project requirement or assume 'critical weld = full NDT.'
What to do instead
Separate 100% visual inspection (always required) from volumetric NDT, whose extent is specified by the contract documents/engineer per AWS D1.1 and IBC; UT/RT percentages are project-specific. Read the question for the stated NDT requirement rather than assuming full coverage.
Stating that special inspection of high-strength bolting is continuous, the same as for welding.
The two are studied together, and 'continuous for welding' gets carried over to bolting.
What to do instead
Memorize IBC Table 1705.2: structural welding special inspection is continuous; high-strength bolting inspection is periodic, with the specific scope defined by the code and the statement of special inspection. Match the inspection frequency to the exact item in the table.
Holding identified discrepancies and inspection results until the final report is issued at project closeout.
Reporting is treated as a paperwork formality rather than a real-time communication duty.
What to do instead
Know the reporting chain and timing: discrepancies and nonconforming work are reported immediately (orally, same day) to the building official and the EOR, followed by written reports; final signed reports are filed at completion. Test answers that delay notification are wrong.