Simplified analysis method for transverse aseismic retainers of continuous girder bridges

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (5) : 182-186.

ZHAO Yibo,XU Xiuli,LI Xuehong,LI Zhijun,LIU Weiqing

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Abstract

Under earthquakes,the reasonable design of aseismic retainers has a good effect on the upper structure of a bridge.The guidelines for aseismic design of highway bridges only ask to install retainers in construction measures,but do not indicate its aspecific design method.In order to simplify the design process of retainers and improve the calculation efficiency,here the simplified method of continuous girder bridge’s calculation model was studied and the dynamic features of the simplified model were compared with those of the FE model to verify the former’s rationality.The vibration modal shapes participating in the simplified analysis were studied.The results showed that for regular bridges,only considering transverse translational modal shapes can meet engineering precision requirements; Compared with the calculation methods in codes of United States and Japan,the simplified method falls somewhere between them,so the simplified method’s reliability is verified; due to considering the influence of structural dynamic characteristics,the seismic forces of retainers decrease with increase in pier height,so the calculation results of the simplified method are more reasonable.

Key words

continuous girder bridge / transverse mode / retainer / simplified method / rationality

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ZHAO Yibo,XU Xiuli,LI Xuehong,LI Zhijun,LIU Weiqing. Simplified analysis method for transverse aseismic retainers of continuous girder bridges[J]. Journal of Vibration and Shock, 2017, 36(5): 182-186

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