NASCLA Accredited Commercial General ContractorMetalsMedium
A contractor is installing pre-engineered metal building (PEMB) components. During the erection of the primary rigid frames, temporary bracing is required to maintain stability until secondary framing and permanent bracing are installed. What is the most critical function of this temporary bracing?
- ATo serve as a permanent structural element of the building frame.
- BTo support future roof live loads prior to panel installation.
- CTo resist wind loads and prevent instability during construction.
- DTo provide a walking surface for erectors during assembly.
Show answer & explanationAnswer & explanation
Correct answer: C. To resist wind loads and prevent instability during construction.
Temporary bracing is essential during the erection of structural steel frames, especially for PEMBs, to provide stability against lateral forces like wind or accidental impacts until the full structural system, including permanent bracing, is completed. Without it, the partially erected frame is highly susceptible to collapse.
Why the other options are wrong
- A. Temporary bracing is removed once permanent bracing and connections are in place; it is not a permanent structural element.
- B. Temporary bracing is not designed for future live loads; that's the role of the completed structure.
- D. Walking surfaces are typically provided by temporary planking or safety nets, not the primary function of structural bracing.
Temporary Bracing (Erection)
Non-permanent structural elements installed during the erection of steel frames to provide stability against lateral loads and prevent collapse until the permanent bracing system is fully installed and functional.
- Crucial for safety during the construction phase.
- Must be designed to resist anticipated erection loads and wind.
- Removed once the structure achieves its full stability.
Memory trick: Brace Temporarily: Block Blows, Build Safely.