Local and global impact factors analysis for PC box girder bridges with corrugated steel webs

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (8) : 22-28.

JI Wei1,2,DENG Lu2,HE Wei2,LIU Shizhong1,LIN Pengzhen1

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Abstract

In order to calculate and analyze the local and global impact factors (IMs) of a simply supported box girder bridge with corrugated steel webs (CSWs) accurately,the motion equations of the bridge and vehicle were established.The two system equations were coupled through the contact condition.Three dimensional vehicle models were established by using the MATLAB software and the finite element model of the PC box girder bridge with CSWs was established by using the ANSYS software,respectively.Considering the random excitation effects of the road roughness,the vibration responses of the bridge nodes could be obtained by using the MATLAB program to solve the dynamic equations of the vehicle-bridge system.According to the relationship between the dynamic and the static deflection,the local and global IMs of the PC box girder bridge with CSWs could be calculated.The obtained local and global IMs were compared and the relationship between the obtained IM and four important parameters,including the type of vehicle,the number of the loaded lanes,vehicle speed,and the road surface condition,was studied.The obtained local and global IMs were also compared with the China code JTG D60—2015 and the AASHTO standard specification.Finally,the reasonable determination method to calculate the local and global dynamic IMs of a simple supported PC box girder bridge with CSWs was presented.The conclusions can provide a reference for determining IMs of this type of bridges.

Key words

corrugated steel web / composite box girder / vehicle-bridge interaction / dynamic impact factor / road roughness

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JI Wei1,2,DENG Lu2,HE Wei2,LIU Shizhong1,LIN Pengzhen1. Local and global impact factors analysis for PC box girder bridges with corrugated steel webs[J]. Journal of Vibration and Shock, 2017, 36(8): 22-28

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