曲线桥梁漂浮抗震体系地震模拟振动台试验及有限元分析  

Shaking table test and finite element analysis on curved bridge with floating seismic system

作　　者：闫磊[1] 李青宁[1] 程麦理 尹俊红[1] 孙建鹏[1] 

机构地区：[1]西安建筑科技大学土木工程学院,西安710055

出　　处：《振动与冲击》2016年第2期1-6,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金(51078306);国家自然科学基金青年基金(51408453);高等学校博士学科点专项科研基金资助项目(20106120110004);高等学校博士学科点专项科研基金资助项目(20136120120022);陕西省自然科学基础研究计划资助项目(2013JQ7007)

摘　　要：针对曲线桥梁地震中损毁严重、修复困难等问题,提出曲线桥梁漂浮抗震体系基本概念、结构组成及设计方法,并探讨其工作原理。将漂浮抗震体系概念、方法用于制作的1/20曲线桥梁模型进行地震模拟振动台试验及有限元分析。结果表明,该模型桥梁在地震发生后桥墩顶加速度峰值较墩底降低率最大为24.6%,梁体在桥墩上部成漂浮状态能减小桥墩受力;试验过程中模型未倒塌,表明该体系抗震性能良好,可用于高烈度抗震地区的曲线桥梁设计。In view of that a curved bridge may be damaged severely in earthquake and its repair is as usual of much difficulty after earthquake, a floating seismic system for curved bridge was proposed, the basic concept, composition and design method of the floating systerm were presented and its working principle was discussed. A 1：20 scale curved bridge model with floating seismic system was built and the shaking table test and finite element analysis on it were conducted. The results show that after installing the floating seismic system, the maximum reduction rate of peak acceleration form the top to the bottom of the pier reaches 24.6 percent. Due to that the beam is floating above the pier, the dynamic force on the pier is reduced, so the bridge model does not collaspe in the test. It indicates that the seismic performance of the floating seismic system is good and it can be used for designing curved bridges built in high seismic intensity areas.

关 键 词：曲线桥梁 漂浮抗震体系 振动台试验 有限元分析 抗震性能 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]