Slide 8 of 67
- How do uplift forces enter the building?
- The figure shows the effects of uplift forces.
- Uplift forces try to lift up one end of the wall and push the other end down.
- In some cases, the uplift force is large enough to tip the wall over.
- Uplift forces are greater on tall short walls and less on low long walls.
- Bearing walls have less uplift than non-bearing walls because gravity loads on shear walls help them resist uplift.
- When gravity loads can not resist all of the uplift, shear walls need hold-down devices at each end. The hold-down device then provides the necessary uplift resistance.