I am designing an occupancy category IV structure that is in a seismic design category of D. The structure is steel bar joists on CMU bearing-shear walls. Where the joists bear on top of the CMU walls, to transfer the diaphragm load to the top of the wall, I am debating whether to use tube collectors between the joists seats per the attached or utilize the joist seats themselves as a rollover load. The question I have is would I need to amplify the load on either the joist seat or the tube collector by the overstrength factor to satisfy the intent of section 126.96.36.199 of ASCE 7-05? Without the overstrength factor applied, the rollover load at each joist seat would be between 2,000 and 4,000 lbs.
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