榕江大桥主桥振动台试验研究  

Shaking table test and analysis of main bridge of Rongjiang Bridge

作　　者：王雷[1,2] 徐艳[3] 

机构地区：[1]广东省公路勘察规划设计院股份有限公司,广东广州510507 [2]湖南大学土木工程学院,湖南长沙410082 [3]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《世界地震工程》2015年第3期39-44,共6页World Earthquake Engineering

摘　　要：榕江大桥是一座柔梁矮塔斜拉桥,为研究其纵向合理抗震体系和减震措施,设计了1∶20缩尺试验模型,并开展了四台阵振动台试验。通过改变塔-梁的连接方式,建立了无约束体系和粘滞阻尼器体系的试验模型,并分别测试不同地震激励下的地震反应。试验结果表明:与无约束体系相比,粘滞阻尼器体系不能减小结构的纵向加速度反应,但能够有效减小纵向位移反应,且随着动峰值加速度的增加,位移控制的效果更明显;在具有相同动峰值加速度的不同地震波激励下,结构的地震响应存在差异,甚至相差较大,应选取与工程场地频谱特征值相符的地震波进行桥梁抗震设计。Rongjiang Bridge is a low-pylon cable-stayed bridge with flexible girder, in order to study it~ reasonable longitudinal seismic structural system and seismic reduction measures, a 1 ： 20 scaled test model was designed and constructed, and tested on four shaking tables system. The testing models of two seismic structural systems, i. e. un- confined system and viscous damper system were established by change of connecting way between the main girder and the middle pylon. The bridge seismic responses of the two systems were tested under different seismic excita- tion. The experimental results show that in comparison to free system, viscous damper system can not reduce the peaks of structural longitudinal acceleration response, but can reduce the peaks of structural longitudinal displace- ment response effectively. With the increase of peak earthquake acceleration, the effect of displacement control is more apparent. Structural seismic responses under different seismic excitations with the same peak acceleration are different, even different obviously. Therefore the seismic waves with similar site spectrum feature should be chosen to do bridge seismic design.

关 键 词：矮塔斜拉桥 振动台试验 抗震结构体系 粘滞阻尼器 无约束体系 

分 类 号：P315[天文地球—地震学]