Thanks Allen for your response to my building drift question.. The elastic
drift (delta s) is as you say the Inelastic Response Displacement (delta M)
divided by ) 0.7R. The problem I see is that section 1630.10.1 Story Drift
Limitation says that "story drifts shall be computed using the Maximium
Inelastic Response Displacement (delta M)". I am afraid that this will be
interpreted as drift that the building cladding system will need to be
Any other thoughts?