Seismic Demand Analysis of a Simply Supported Girder Bridge in Liquefied or Non-liquefied Ground

WANG Xiao-wei, LI Chuang, YE Ai-jun, SHANG Yu

China Journal of Highway and Transport ›› 2016, Vol. 29 ›› Issue (4) : 85-95.

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China Journal of Highway and Transport ›› 2016, Vol. 29 ›› Issue (4) : 85-95.
Bridge and Tunnel Engineering

Seismic Demand Analysis of a Simply Supported Girder Bridge in Liquefied or Non-liquefied Ground

  • WANG Xiao-wei, LI Chuang, YE Ai-jun, SHANG Yu
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Abstract

In order to analyze seismic response of a simply supported bridge in liquefiable river valley, numerical simulation of a centrifuge testing was conducted based on OpenSees by the two dimensional site-structure integration simulation method to verify the reliability of the simulation method. A finite element model of typical simply supported three-span bridge in river valley was then established. And the effects of ground liquefaction on the seismic response of the site and all parts of the simply supported bridge were analyzed. The results show that, compared with the acceleration spectrum of input ground motion, ground liquefaction extends the predominant period of the acceleration response spectrum in the valley surface. Besides, compared with non-liquefied ground, ground liquefaction remarkably increases the deformation in the ground surface, bending moment of piles foundation in pile top and soil division section, the inclination of piers and the displacement of sliding supports. However, the effect of ground liquefaction on bending moment at pier bottom is little.

Key words

bridge engineering / seismic response / finite element method / simply supported girder bridge / liquefaction

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WANG Xiao-wei, LI Chuang, YE Ai-jun, SHANG Yu. Seismic Demand Analysis of a Simply Supported Girder Bridge in Liquefied or Non-liquefied Ground[J]. China Journal of Highway and Transport, 2016, 29(4): 85-95

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