Part 1 - Problem 04: This deliverable states that we are asked to use flexible diaphragms for the existing structure (Deliverable 2 states that "Diaphragms should be completely and have zero stiffness"). Taking this into account, we considered that for the analysis of the existing structure the rigid diaphragm condition was neglected and we did not use diaphragms (wall members/slab), as it was not imposed . Is it correct ?

Question

Part 1 - Problem 04:  This deliverable states that we are asked to use flexible diaphragms for the existing structure (Deliverable 2 states that "Diaphragms should be completely and have zero stiffness"). Taking this into account, we considered that for the analysis of the existing structure the rigid diaphragm condition was neglected and we did not use diaphragms (wall members/slab), as it was not imposed . Is it correct ?

Accepted Answer

Yes, this question in Deliverable 4 asks you to consider how the modal results will differ when you change the initial Deliverable 2 assumption and impose a rigid diaphragm.