Slide 10 of 19
Notes:
- This figure shows a stone foundation
- Can’t anchor a bolt into stone
- Need to get engineer to design alternative system
- We will discuss a few common alternatives shortly
- Identify whether foundation is on reinforced masonry
- Stone foundation is always on reinforced masonry
- Brick foundation is usually in reinforced masonry
- Un-reinforced: If every 5th or 7th course of bricks is a header course (bricks are turned perpendicular to other courses)
- Very little resistance to shear earthquake forces
- Must use an engineered retrofit design, such as replacement, new parallel system, concrete capping (discussed shortly)
- Reinforced masonry, while not as strong as concrete, is strong enough to resist the seismic loads of light wood frame buildings when fully grouted
- Some adhesive anchor products can be used for reinforced masonry.
- Hollow masonry is usually un-reinforced
