多点激励下非规则高墩曲线桥梁地震响应试验研究  

Experimental study on seismic of irregular high piers curved bridge under multi-point excitation

作　　者：程麦理 李青宁[2] 闫磊[2] 尹俊红[2] 

机构地区：[1]延安大学建筑工程学院,陕西延安716000 [2]西安建筑科技大学土木工程学院,陕西西安710055

出　　处：《振动工程学报》2016年第5期874-880,共7页Journal of Vibration 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);陕西省自然科学基础研究计划资助项目(2013JQ7007)

摘　　要：根据结构模型振动台试验相似理论和大跨结构多点激励理论,以某非规则钢筋混凝土高墩曲线连续梁桥为研究对象,建立缩尺比为1∶20的桥梁结构试验模型,研究该非规则曲线桥梁模型在地震波多点激励作用下结构的地震响应规律。研究表明:随着地震波强度等级增大,非规则曲线桥梁结构一阶频率下降速度先快后慢,阻尼基本呈线性增加;非规则曲线桥梁结构地震响应具有明显的空间性;局部地形效应对曲线桥梁结构地震响应有放大作用;不同频谱地震波对非规则曲线桥梁结构地震响应影响各异,且差别较大。因此,在非规则高墩曲线梁桥结构抗震分析中应考虑多点激励效应的影响。According to the structure model shaking table test similar theory and the long-span structure multi-point excitation theory, and considering a certain irregular reinforced concrete high piers curved continuous beam bridge, an 1：20 bridge struc- ture test model is established. Then, the seismic response of the irregular curved bridge model under multipoint excitation is studied. The results show that the primary frequency of the irregular curved bridge structure descends fast first, and then slowly. The damping ratio basically increases linearly. The seismic response of the irregular curved bridge structure has obvi- ous spatiality. The local topographic effect has an amplificatory effect on the seismic response of the curved bridge structure. Different spectrum seismic waves have different influences on the seismic response of the irregular curved bridge structure. Hence, the multipoint excitation should be considered when analyzing the irregular high piers curved bridge structure.

关 键 词：曲线桥梁 非规则 多点激励 局部地形效应 振动台试验 

分 类 号：U442.5[建筑科学—桥梁与隧道工程]