高墩桥梁抗震1.doc

郑州大学土木工程学院硕士研究生课程论文课程名称抗震工程学学时学分姓名张兴达主讲教师王建强指导教师(若已选导师则填,否则不填) 年级 2014 学号 z201421409 供职单位河南省交通规划勘察设计院联系电话 ********** Email 492416217@ 提交日期 浅论高墩桥梁抗震措施摘要: 为研究高墩桥梁抗震措施, 以某高墩桥梁为例进行分析。建立该桥所有联的线弹性计算模型, 进行动力特性分析和反应谱分析。分析结果表明: 支座顶面与梁底面发生了相对滑移, 支座剪切变形较大, 存在落梁隐患。在该桥上设计合适的顺桥向连梁装置、横向弹塑性挡块等抗震措施后, 通过非线性时程分析验证其抗震效果。分析结果表明,采用的抗震措施可有效地控制墩顶位移、减小地震反应。关键词:连续梁桥;高桥墩;抗震;反应谱法;非线性;时程分析法 Study of Seismic Resistance Measures for High-Rise PierBridges Located in High Intensity Seismic Region Abstract:To study the seismic resistance measures for high-rise pier bridges located in high intensity seismic region,a high-rise pier continuous girder bridge in the region was cited as an example and linear elastic calculation models for all continuous units of the bridge were built and the analysis of the dynamic behavior and re-sponse spectrum was results of the analysis show the relative slip at the top of the bearings and at the bottom of the girder of the bridge takes place,the shear deformation of the bearings is great and the potential danger of fall of the girder the seismic resist-ance measures,such as the appropriate longitudinal girder link devices and the transverse elastic stopping blocks,are designed for the bridge,the effect of the measures has been verified by the nonlinear time-history analysis and the results of the analysis show that the measures can effec-tively control the displacement atop the piers and reduce the seismic words:continuous girder bridge;high-rise pier;seismic resistance;response spectrum method;nonlinearity;time-history analysis method 1前言随着我国高等级公路建设的发展, 高烈度地震区高墩桥梁日益增多。高墩桥梁受震害后修复困难, 影响地震后生命线的畅通, 将给地震区带来严重的次生灾害[1~ 4] 。目前, 国内外尚缺乏高墩桥梁经受高烈度地震的经验, 而现有的大多数桥梁工程抗震设计规范只适用于常规桥梁抗震分析, 我国《公路桥梁抗震设计细则》(JTG/T B02-01-2008)[5] 规定墩高超过 30m的桥梁应作专项研究。以处于高烈度区(设防烈度 )的一座大桥为例,分别进行了反应谱分析与非线性时程分析, 研究了高墩桥梁在高强度地震作用下的地震反应特点,提出 2 种抗震措施,并采用非线性时程分析法验证其抗震效果。 2工程概况及地震动参数某高地震烈度区大桥上部结构为 40m跨分离式双幅先简支后连续 T梁,单幅桥面宽 m。大桥 4跨一联,共设置 4道伸缩缝