what is different between diagonal shear and shear friction?
what is different between diagonal shear and shear friction?
(OP)
please explain what is different between diagonal shear and shear friction. I have to consider both or not. Now I would like to design retaining wall with lift join.





RE: what is different between diagonal shear and shear friction?
Shear friction only applies at a construction joint. It relies on the roughness of the two adjacent pours providing a surface that has a frictional resistance. The bars connect those two surfaces together. So to fail in friction, the bars must yield. A common error is to try to apply shear friction at other locations than at construction joints. I've seen good structural designers make this mistake. By code, you can't apply shear friction at anyplace other than CJ's although there's a kind of pseudo shear friction at corbels and dapped beams.
For a retaining wall, shear friction would only apply at the wall to slab joint. Right above that, you have diagonal shear.
RE: what is different between diagonal shear and shear friction?
For friction to work reliably across a joint, the two sides of the joint must be clamped together. In the shear friction concept, the clamping force is provided by reinforcement acting in tension.
RE: what is different between diagonal shear and shear friction?
RE: what is different between diagonal shear and shear friction?
RE: what is different between diagonal shear and shear friction?
At the time, ABAM did a lot of prestress and precast design if I remember correctly, and the prestress yard they helped create still exists in Tacoma and is known as Concrete Technology Corporation.
Bob Mast was the "M".
Mike McCann
MMC Engineering
http://mmcengineering.tripod.com
RE: what is different between diagonal shear and shear friction?
Mike McCann
MMC Engineering
http://mmcengineering.tripod.com