CMU Isolation
CMU Isolation
(OP)
Lately we have been running into quite a few 5-6 story buildings with light-framed load bearing walls and sheathed shear walls. These buildings typically have masonry stair and elevator towers as well. Does anyone detail the interface between the diaphragm and CMU to allow for the code-required amplified story drift? If so, how?






RE: CMU Isolation
I am working on a project in SDC B, using braced frames without seismic detailing, and I must multiply my ultimate deflections by 3!!! This seems excessive to me, but I will detail wide sealant joints to isolate interior CMU partitions if necessary.
DaveAtkins
RE: CMU Isolation
RE: CMU Isolation
Per the universal laws of physics ...i.e. Hooke's Law - force follows stiffness. The lateral forces on the building will first attempt to move the CMU and not engage the full strength of the shearwalls...
Your calculated deflection may be due to the shearwalls or moment frame and they may not be accurate as the CMU shafts will serve to stiffen the building and take more load, or most all the load.
RE: CMU Isolation
RE: CMU Isolation