Influence Inelastic z of Cone Seismic
:rete and Steel Response of R Properties on Calculated Reinforced Concrete Frames
Mehdi Saiidi and James D. Hart
Appears on pages(s):
beams (supports); columns (supports); compressive strength: computation;ductility; earthquakes; frames; models; moments; reinforced con-crete;reinforcing steels; structural design; yield strength.
Differences between a structure’s specified material strengths and the actual values can lead to approximations in the nonlinear seismic response which may undermine the advantages of nonlinear analysis. The effect of these differences on important seismic response parameters is presented for reinforced concrete frames. Two frames, one with five stories and the other with ten, were studied using several strength combinations and two input earthquakes. The maximum ductility demand was the most sensitive parameter, and changed as much as 30 percent as a result of an 8 percent change in the steel yield stress. Possible approaches to account for the differences between the actual and specified material strengths are discussed.