Slide 19 of 45
Shear Connections in the Load Path
- There are many breaks in the continuity of a conventional platform-framed building, particularly if it rests on cripple walls.
- Shear forces created by the earthquake must be effectively transferred through these breaks in order for the load path to be complete.
- The following elements must connected to each other to develop this complete path.
- Roof and ceiling must be attached to the top plate(s).
- Top plate must be attached to the sheathing.
- Sheathing must be attached to the sole plate.
- Sole plate must be attached to the floor framing.
- Floor framing must be attached to the top plate(s).
- Top plate(s) must be attached to the sheathing.
- Sheathing must be attached to the foundation sill plate.
- Foundation sill plate must be attached to the foundation.
- When these elements are properly connected, they form an unbroken load path from the roof and floor diaphragms to the ground.
- Discussion of figure
- Shows 44 elements in the shear load path.
- Note that this shows standard platform framing where the floor and roof are supported by the walls
- Point out roof sheathing, wall structure etc.
- Note the dropped ceiling between the 2nd and 1st floor. The load path must go around this.
- If even one of these elements is missed or poorly installed, you will NOT HAVE A LOAD CONNECTION FOR THE BUILDING!