Bridges are essential lifelines for transportation networks during and after an earthquake event, providing routes for emergency response and evacuations. For this reason, bridge fragility modeling has been a major focus in earthquake research, as fragility analysis aids in the post-event determination of possible damage of bridges as well as in pre-event mitigation planning. While fragility an...

This paper represents the first effort in seismic fragility analysis of a structure using a structural analysis model developed on the basis of measured vibration data. An instrumented highway bridge is used to demonstrate the analysis procedure involving measuring ambient vibration, identifying modal parameters from the measured data, updating a preliminary FE model (obtained from structural d...

This article presents the results of a seismic risk assessment of the bridge network in Charleston, South Carolina and the surrounding counties to support emergency planning efforts, and for prioritization of bridge retrofit. This study includes an inventory analysis of the approximately 375 bridges in the Charleston area, and convolution of the seismic hazard with fragility curves analytically...

Reinforced concrete frame buildings with Open Ground Story (OGS) are one of the most common building configurations in urban habitat. These configurations are known to be vulnerable to seismic excitations, primarily due to the sudden loss in strength in the ground story and differential stiffness distribution throughout the structure. The differential stiffness distribution is attributed primar...

Fragility surfaces give the probability of failure for structural or non-structural systems as a function of two parameters, the earthquake magnitude and epicentral distance. These parameters provide a unique characterization of the ground motion. In contrast, the current characterization of the ground motion by a single parameter, e.g., the Peak Ground Acceleration (PGA), can be unsatisfactory...

In this paper, the seismic collapse probability of special steel moment-resisting frame (SSMRF) structures under near fault pulse-like and far fault ordinary ground motions is evaluated through fragility analysis. For this purpose, five sample frames with 3 to 15 stories are designed and imposed to the ground motion excitations with different characteristics. Fragility curves are derived for th...