Seismic analysis method for RC bridge bents in mountain areas

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Journal of Vibration and Shock ›› 2015, Vol. 34 ›› Issue (18) : 1-6.

SUN Zhi-guo1, SI Bing-jun1, CHEN Can1, WANG Dong-sheng2

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Abstract

Bents are widely used as bridge columns in mountain areas. The seismic failure mechanism of the bents is complex under transverse seismic actions. Also, no practical seismic analysis method is available to evaluate the seismic behavior of the bents. A practical seismic analysis method for RC bridge bents in mountain areas was proposed based on quasi-static and dynamic time-history analysis method. The failure mode of the pier and the deformation capacity of the bent were obtained by fiber column element and shear strength model for column section. Then, the failure mode and deformation capacity of the bent under different ground motion intensity could be defined by time-history analysis. At last, the seismic behavior of 2 bridge bents in one bridge in mountain areas were evaluated by the proposed method. It is found that the axial load of the piers in the bent will be changed significantly as a result of the transverse seismic action. Before yielding of the pier, the variation range of the axial load increased as the lateral displacement increasing. While the range would not changed after yielding of the pier. Also, the variable axial load would lead to shear failure of the piers. The work would provide reference for seismic design and analysis of the bridge bents.

Key words

seismic design of bridges / bridge bents / seismic behavior / flexural-shear failure / numerical analysis

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SUN Zhi-guo1, SI Bing-jun1, CHEN Can1, WANG Dong-sheng2. Seismic analysis method for RC bridge bents in mountain areas[J]. Journal of Vibration and Shock, 2015, 34(18): 1-6

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