Rooted in structural dynamics theory, a simplified procedure, denoted as static analysis procedure, is presented for estimating seismic demands for bridges crossing fault-rupture zones and deforming into their inelastic range. This procedure estimates the total seismic demand by superposing peak values of quasi-static and dynamic parts. The peak quasi-static demand is computed by nonlinear static analysis of the bridge subjected to peak values of all support displacements applied simultaneously whereas the peak dynamic demand is estimated by linear static analysis of the bridge due to lateral forces appropriate for bridges crossing fault-rupture zones. This procedure is shown to provide estimates of seismic demands that are accurate enough to be useful for practical applications. Application of the static analysis procedure is illustrated through and example. Comments on a procedure currently being used by practicing engineers are also provided.
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