规则连续梁桥地震易损性研究

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振动与冲击 ›› 2014, Vol. 33 ›› Issue (20) : 140-145.

论文

规则连续梁桥地震易损性研究

张菊辉1，管仲国2

作者信息 +

Seismic vulnerability analysis of regular continuous girder bridges

ZHANG Ju-hui1，GUAN Zhong-guo2

Author information +

文章历史 +

摘要

基于位移延性比探讨规则连续梁桥在不同损伤状态下的结构性能控制指标；基于OpenSees平台采用纤维模型建立结构动力分析模型，选取100条强震记录通过非线性时程反应分析计算结构地震易损性曲线。研究不同墩高、支座形式及配箍率对结构地震易损性影响，结果表明，连续梁桥的地震易损性受延性发育程度影响较大，发生中等与轻微破坏概率较相近，对严重破坏有较好的耐损性；结构耐损性随墩高的增大而增加；采用板式橡胶支座可显著提高矮墩桥梁的耐损性，对高墩则有限；配箍率对结构早期损伤影响较小，对防倒塌能力影响较大。

Abstract

Structural performance indices of the regular continuous girder bridges under different damage states were discussed and constructed by displacement ductility ratio. Based on the OpenSees platform, a structural dynamic analysis model was established by using the nonlinear fiber beam elements. 100 earthquake ground motion records were selected, and the nonlinear time-history analysis was performed, thus the fragility curves under different damage states were constructed. Through parametric analysis, the effects of pier height, bearing types and transverse reinforcement ratios on the fragility curves were studied. The results show that the ductile development degree of the continuous bridge has a great effect on the structural seismic vulnerability. The fragility curves obtained under both minor damage and moderate damage seem to be very close; while under extensive damage, the bridge shows a good performance against earthquake forces. With the increase of the pier height, the lower level of damage probability of the structure is observed; meanwhile, the improvement in the fragility by using the plate rubber bearings is excellent for a short-pier bridge, but very limited for a high-pier one. The effect of increasing the transverse reinforcement ratio on fragility curves can be neglected for structural damage in early stages, but can significantly increase the structural capacity from collapse.

导出引用

张菊辉;管仲国. 规则连续梁桥地震易损性研究[J]. 振动与冲击, 2014, 33(20): 140-145

ZHANG Ju-hui;GUAN Zhong-guo. Seismic vulnerability analysis of regular continuous girder bridges[J]. Journal of Vibration and Shock, 2014, 33(20): 140-145