Optimal Intensity Measures

Intensity Measures (IMs) provide the relationship between Engineering Demand Parameters(EDPs) and seismic hazard characteristics for different structures and hence, their role in performance-based bridge design is significant. A few studies have investigated the optimal IMs for bridges under horizontal ground motions, however, detailed studies to explore the optimal IMs for isolated-bridges under the coupled vertical and horizontal records are very rare. A procedure for the selection of optimal IMs for seismic-isolated bridges under the combined strong Horizontal Component (HC) and Vertical Component (VC) seismic excitations is required. The Soil- Structure-Interaction (SSI) effects and uncertainties of soil properties were considered to determine optimal IMs.