Abstract
Isolated bridges are commonly designed in the near‐fault region to balance excessive displacement and seismic force. Optimal intensity measures (IMs) of probabilistic seismic demand models for isolated bridges subjected to pulse‐like ground motions are identified in this study. Four typical isolated girder bridge types with varied pier height (from 4 m to 20 m) are employed to conduct the nonlinear time history analysis. Totally seven structure‐independent IMs are considered and compared. Critical engineering demand parameters (EDPs), namely, pier ductility demands and bearing deformation along the longitudinal and transverse directions, are recorded during the process. In general, PGV tends to be the optimal IM for isolated bridges under pulse‐like ground motions based on practicality, efficiency, proficiency, and sufficiency criterions. The results can offer effective guidance for the optimal intensity measure selection of the probabilistic seismic demand models (PSDMs) of isolated bridges under pulse‐like ground motions.
Highlights
It has been observed that ground motion recordings in the near-fault region, which is usually taken as within 20 km from the fault rupture, tend to differ from far-field rivals in three main characteristics, that is, velocity pulse, directivity effect, and large vertical acceleration component [1]
Some of these differences are usually shown in the velocity and displacement time series, which have been attributed to two effects: the rupture directivity effect and the fling step. e rupture directivity denotes the effect of rupture propagation relative to the site [2]. e near-fault directivity often manifests in the fault-normal direction, which is the direction perpendicular to the surface of the fault rupture
Probabilistic seismic demand analysis (PSDA) is utilized to derive the fragility curves of bridges, which can establish the probabilistic relationship between the engineering demand parameters (EDPs) of components and the ground motion intensity measures (IMs) [18]
Summary
It has been observed that ground motion recordings in the near-fault region, which is usually taken as within 20 km from the fault rupture, tend to differ from far-field rivals in three main characteristics, that is, velocity pulse, directivity effect, and large vertical acceleration component [1]. Some of these differences are usually shown in the velocity and displacement time series, which have been attributed to two effects: the rupture directivity effect and the fling step. Efficiency, practicality, proficiency and sufficiency, and hazard computability are selected to evaluate the candidate intensity measures
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