Seismic Response Characteristics and Parameter Analysis of the Multi-span Simply Supported Girder Bridge across Strike-slip Faults
To investigate the seismic response of the multi-span simply supported girder bridge across the strike-slip fault,a 3-dimensional dynamic elastic-plastic analysis model is established for a 4-span simply supported gird-er bridge by using OpenSees.Forty sets of bidirectional ground motions across the fault are synthesized by the de-composition-incorporation method.These ground motions are then input into the model through multi-support ex-citation.A dynamic nonlinear time history analysis is carried out to investigate the seismic response of the multi-span simply supported girder bridge under the action of the ground motions across the strike-slip fault.In addition,the effects of the crossing angle and the crossing position of the multi-span simply supported girder bridge across a strike-slip fault on the bridge are analyzed.The results show that the bridge under the action of the ground motions across a strike-slip fault will experience a significant displacement response.Both the crossing angle and the cross-ing position have a significant effect on the seismic response of the bridge.Additionally,the torsion effect of the simply supported girder bridge under the action of the cross-fault ground motions should not be neglected.
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