Failures of Wall Anchors During Earthquakes (a – d)

Failures of Wall Anchors During Earthquakes (a – d)

1. The roofs and floors of many concrete tiltup and masonry buildings rest on ledgers bolted into the wall.
2. When an earthquake occurs, the building’s movement may rip out the nails holding the roof in place,
3. or split the ledger along the wood grain allowing the roof to collapse.
4. "Dog ties,” also known as government anchors, will not always prevent unreinforced masonry walls from separating from floors or roofs.