人字桥梁多维地震作用下振动台试验研究  

Study on shaking table test of herringbone curve bridge in case of multi-dimensional earthquake action

作　　者：李青宁[1] 尹俊红[1] 毕研超 张瑞杰[1] 孙建鹏[1] 韩春[1] 

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]徐州工业职业技术学院化工学院,江苏徐州221140

出　　处：《世界地震工程》2015年第2期8-15,共8页World Earthquake Engineering

基　　金：国家自然科学基金资助项目(51078306;51408453);高等学校博士学科点专项科研基金资助项目(20106120110004;20136120120022)

摘　　要：设计制作一座人字曲线桥模型,进行了多维输入的振动台试验,分析了结构在地震作用下的震害现象,并探讨了多维输入下的地震响应特点。结果表明:人字曲线桥梁梁体和桥墩主要表现为以弯曲裂缝为主的破坏模式,竖向输入是梁跨中裂缝出现的主要原因,桥墩裂缝主要受水平输入的影响。梁跨中加速度响应受竖向输入影响最大,墩顶纵桥向加速度响应受竖向输入分量影响并不显著。单维竖向输入降低墩体竖向加速度响应,三向输入则加大墩体竖向加速度响应;对于人字桥梁伸缩缝宽度设置,分支直梁处可只考虑纵桥向地震输入,分支曲梁处则要考虑水平双向地震输入。A herringbone curved bridge model was designed to carry out the multi -dimensional shaking table ex- periment and analyze the earthquake damage phenomenon and seismic response of the bridge structure under multi- dimensional earthquake input. The results show that： the bridge beam and pier are mainly dominated by bending crack failure mode, the vertical input is the main cause of cracks in midspan, pier cracks are mainly affected by the horlzohtal input. Acceleration response in midspan mainly is affected by the vertical input,longitudinal acceleration response of pier top is not affected obviously by the vertical input. Vertical acceleration respons of pier would be re- duced for vertical input, but would be increased for three - dimensional input. In regard to setting of expansion joint width of herringbone curved bridge, longitudinal earthquake input only need to be considered for straight beam, but two - dimensional horizontal direction input should be considered for curve beam. Relative displacement of two pier transverse on branch had less impact for vertical earthquake input.

关 键 词：人字曲线桥梁 高墩 多维输入 振动台试验 震害 地震响应 

分 类 号：U442[建筑科学—桥梁与隧道工程]