1.School of Architecture and Planning, Yunnan University, Kunming 650500, China;
2.Sichuan Highway Planning, Survey, Design and Research Institute Ltd., Chengdu 610041, China
Abstract:In order to reduce the moment on the tower section under near-field earthquake, a suspension bridge tower was innovatively installed with the corrugated steel web beam.Taking the Dadu river bridge as an example, and based on the pseudo-static test data of the beam,
a numerical structural dynamics model was established.The structural seismic responses were calculated under different types of near-field ground motions to investigate the seismic performance of the suspension bridge and its near-field effect.The results show that the bridge tower with corrugated steel web beam has the advantages of light weight and low rigidity, and more conforms to the design idea of strong column weak beam and strong shear weak bend.Under high intensity near-field earthquake, the ductility of corrugated steel web beam is reasonable to the seismic strategy.The pulse effect has a greater influence on the response.Therefore, it suggests that for this type of bridges, the near-field pulse effect should be paid more attention. The response to the hanging wall effect is less than that to a ground motion without near-field effect, so the bridge on the hanging wall is safer.Under transverse seismic excitation, the near-field pulse effect has a greater influence on the displacement and moment of the bridge tower.
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