整体式桥台地震反应机理分析

发布时间：2018-01-14 18:44

本文关键词：整体式桥台地震反应机理分析　出处：《岩土力学》2014年11期 　论文类型：期刊论文

【摘要】：整体式桥是一种新的桥型,能够极大地节省长期维护和运营费用,值得在国内大力推广应用,但目前对整体式桥台在地震作用下的动力反应还很缺乏认识。通过对典型的单跨整体式桥台的地震反应进行动力数值模拟,分析了地震加速度峰值、桥台高度、桥梁跨度等主要因素的影响及其机理,并探讨了桥台后增加柔性隔离层及采用加筋土这两种措施的减震效果。结果表明,目前桥台抗震规范采用的M-O方法不能合理地描述整体式桥台后动土压力的大小和分布,其预测结果偏不安全;柔性隔离层虽然可以减小桥台后的动土压力,但同时也会导致较大的桥台变形和弯矩;填土中加筋能够提供水平拉力,可以有效减小地震作用下桥台的最大弯矩和水平位移。
[Abstract]:The whole bridge is a new bridge type, can greatly reduce the long-term operation and maintenance costs, it is worth to popularize in the domestic application, but the dynamic response of the integral abutment under earthquake is still a lack of understanding. Based on a typical single span integral abutment anti earthquake should be carried out a numerical simulation of the dynamic analysis. The peak value of earthquake acceleration, main factors affecting the bridge abutment height, span and its mechanism, and to explore the abutment increased after flexible isolation layer and the damping effect of the reinforced soil of the two measures. The results show that the magnitude and distribution of earth pressure M-O method cannot currently used to describe the seismic code of abutment of integral abutment reasonably after the forecasting result is not safe; the flexible isolation layer can reduce the Bridge although Taiwan after the earth pressure, but also cause the abutment deformation and bending moment of soil reinforcement can provide; The horizontal tension can effectively reduce the maximum bending moment and horizontal displacement of abutment under the action of earthquake.

【作者单位】：清华大学土木工程系;清华大学土木工程安全与耐久教育部重点实验室;
【基金】：国家自然科学基金(No.41272280);国家自然科学基金重点项目(No.51038007) 清华大学自主科研计划项目(No.2012THZ02-2) 教育部留学回国人员科研启动基金课题(2010年)
【分类号】：U442.55
【正文快照】： 1引言传统的桥梁设计中桥身和桥台/桥墩之间设有支座和伸缩缝,支座和伸缩缝容易遭到腐蚀破坏和堵塞,需要经常维护及维修,不仅需要大量资金和人力,还对交通的正常运行造成影响,其弊病日益受到高度关注[1-2]。例如,根据1986年美国进行的一项调查统计,全美约57万座桥梁中有13万多

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