横桥向地震作用下简支梁桥偏心碰撞反应参数研究

PDF(1906 KB)

振动与冲击 ›› 2012, Vol. 31 ›› Issue (18) : 132-136.

论文

横桥向地震作用下简支梁桥偏心碰撞反应参数研究

石岩1.2 , 王军文1.2 , 李建中3 , 艾庆华1

作者信息 +

Parametric Studies of Seismic Eccentric Pounding Responses For Simply-supported Girder Bridges under Transverse Earthquake

Shi Yan1 Wang Junwen1 Li Jianzhong2 Ai Qinghua1

Author information +

文章历史 +

摘要

汶川大地震中桥梁结构横向抗震挡块遭到严重破坏，其中部分是由于梁体与其发生碰撞所致。针对桥梁结构横向抗震挡块与梁体在强震作用下的碰撞现象，建立了考虑上部结构与挡块间偏心距、支座非线性和墩柱弹塑性的横桥向单墩碰撞模型。采用非线性地震反应时程分析方法，详细研究了偏心距、碰撞刚度、初始间隙、桥墩线刚度、上部结构与盖梁质量比、上下部结构周期比以及墩柱弹塑性等参数对桥梁结构横向地震反应的影响。结果表明：考虑偏心的碰撞进一步增强了系统的非线性，低高度梁(e<70cm)不考虑偏心碰撞分析可能导致不保守的结果，需引起重视。

Abstract

During Wenchuan earthquake, some lateral shear keys of bridges suffered severe damage partly caused by pounding between shear keys and girders. Based on the pounding phenomenon between shear keys and girders under strong ground motions，a pounding model of single column considering the eccentric distance between shear keys and girders, nonlinear behaviors of bearing and the elasto-plastic behaviors of piers has been developed. With the time history analysis method for the nonlinear seismic responses of structues, many parameters that have effects on lateral seismic response of bridges such as eccentric distance, pounding stiffness, initial gap between shear key and girder, linear stiffness of pier, mass ratio of supstructure and bent cap, period ratio of supstructure and substructure, and elasto-plastic behaviors of piers are analyzed. The results indicate that the pounding considering the eccentric distance between shear keys and girders enhances the systematic non-linearity, ignoring the eccentric pounding response in the analysis for lower hight girder (e<70cm) can cause nonconservative results, which should pay more attention in the future.

导出引用

石岩.; 王军文.; 李建中; 艾庆华. 横桥向地震作用下简支梁桥偏心碰撞反应参数研究[J]. 振动与冲击, 2012, 31(18): 132-136

Shi Yan Wang Junwen Li Jianzhong Ai Qinghua. Parametric Studies of Seismic Eccentric Pounding Responses For Simply-supported Girder Bridges under Transverse Earthquake[J]. Journal of Vibration and Shock, 2012, 31(18): 132-136