Seismic response evaluation of retrofitted Vincent Thomas bridge under spatially variable ground motions

In this study, a three dimensional finite element (FE) model of the Vincent Thomas bridge is developed using a widely used software. In order to show the appropriateness of the model, the eigenproperties of the bridge model are evaluated and compared with the results of system identification from ambient vibration and the 2008 Chino Hills earthquake response data. A new simulation technique is developed to generate spectrum-compatible spatial variable ground motions. The response of Vincent Thomas bridge under spatially varying ground motion is evaluated by nonlinear time history analysis. Using spatially variable motions, it is found out that the response in some locations on the bridge girder, may be under-predicted even if the motion with maximum intensity is uniformly applied at all supports.

► Detailed and validated finite element model of Vincent Thomas suspension bridge. ► New algorithm to simulate spectrum compatible spatially variable ground motions. ► New iterative algorithm using evolutionary power spectral density function. ► Compare response of the bridge under spatially variable and uniform ground motions.