Vertical ground motions are considered in the seismic design of critical structures such as nuclear power plants and dams. Results of a recent study revealed that the effect of vertical component ground motion on the seismic response of ordinary highway bridges is also significant, especially in near‐fault regions (Gülerce and Abrahamson, 2010; Gülerce et al., 2012). In the probabilistic seismic‐hazard assessment (PSHA) environment, site‐specific vertical design spectra may be developed by computing the hazard independently for the vertical ground‐motion component, which in fact requires accurate prediction of vertical component ground‐motion intensity measures. However; new and updated...

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