What wind speed is used for designing braces?

• A. 60 mph
• B. 80 mph
• C. 120 mph
• D. 40 mph

Answer: (B)

Temporary bracing must resist the lateral wind loads that act on wall panels during erection before the full frame is in place. Using 80 mph as the design wind speed provides a conservative, practical baseline that reflects common tilt‑up practice and ensures braces are sized to handle typical construction gusts and dynamic effects. This speed balances safety with practicality: it’s high enough to cover ordinary construction wind events without forcing excessive, costly bracing that would be needed only for very high-wind regions. If a project is in an area with higher wind risk, engineers would use the site’s actual design wind speed for bracing, but 80 mph is the standard assumption for general practice. The other options are less representative of the standard baseline for braces: those values would under- or over‑estimate the needed bracing for typical construction conditions.