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| An experimental study on pounding response of a self-anchored suspension bridge with single tower under pulse-like ground motions |
| ZHENG Qinfei,YAN Weiming, LUO Zhenyuan, XU Weibing |
| Beijing Key Lab of Earthquake Engineering and Structural Retrofit, Beijing University of Tech-nology, Beijing 100124, China |
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Abstract In order to explore the seismic response of a self-anchored suspension bridge when considering the collision effect under the action of pulse-like ground motions,a self-anchored suspension bridge with single tower was taken as a prototype to design the test model with a reduced scale of 1∶20,and three near-fault pulse seismic waves of different pulse periods were selected to perform comparative tests under uniform excitation and traveling wave excitation on a multiple-earthquake-simulation-shake-table system.According to the test results,the collision effect has significantly aggrandized the deformation of side pier bottom but reduces the displacement response of the support in varying degrees; the collision effect at ends of the model bridge first heightens and then recedes as collision gap widens while the traveling wave excitation has intensified collision at bridge ends so that the collision effect significantly amplifies the deformation of side pier bottom and deformation of main tower bottom; the closer the pulse period of pulse-like ground motions is to the basic cycle of model bridge girder,the more intense the collision effect and the more significant amplifying effect on the deformation of side pier bottom and main tower bottom,but less effect on the reduction of support displacement.Therefore,factors such as collision effect,traveling wave effect and pulse characteristics of ground motions should be considered at seismic or aseismic design of a self-anchored suspension bridge.The findings will provide references for studying bridge structure collision response.
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Received: 01 September 2017
Published: 15 February 2019
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