CSLB General Building (B)Framing and CarpentryMedium
During a shear wall inspection, the building inspector confirms that hold-down anchors are properly installed at both ends of a shear wall segment. What is the primary structural purpose of these hold-down devices?
- ATo reduce the required thickness of the wall sheathing panels
- BTo resist uplift and overturning forces generated by lateral loads at the wall ends
- CTo increase the nailing spacing allowed on the wall sheathing
- DTo transfer vertical gravity loads from the roof directly to the foundation
Show answer & explanationAnswer & explanation
Correct answer: B. To resist uplift and overturning forces generated by lateral loads at the wall ends
When lateral forces (wind or seismic) act on a shear wall, they create an overturning moment that tends to lift one end of the wall while compressing the other. Hold-down anchors are steel connectors that tie the wall framing to the foundation or lower framing to resist this uplift/tension force at the wall ends.
Why the other options are wrong
- A. Sheathing thickness is determined by shear capacity requirements, unrelated to hold-down function.
- C. Hold-downs do not affect nailing spacing requirements, which are governed by the shear wall schedule.
- D. Gravity load transfer is handled by studs and posts, not primarily by hold-down hardware.
Hold-Down Anchor
A steel connector installed at the ends of a shear wall to resist uplift (tension) forces created by lateral load overturning moments.
- Resists overturning, not shear itself
- Typically bolted to end studs and anchored to foundation
- Critical at narrow or high-aspect-ratio shear walls
Memory trick: Lateral force tries to tip the wall—hold-downs hold it down.