超Ⅷ区预应力混凝土连续刚构桥抗震性能分析
2017-10-21李立君白羽
李立君+白羽
摘要:以某高地震烈度地区的某预应力混凝土连续刚构桥为研究对象,运用MIDAS CIVI有限元软件对印尼超Ⅷ区的雅万高铁线段的某预应力混凝土连续刚构桥建立空间结构模型,计算分析连续刚构桥的动力特性,并用反应谱和时程分析法分析了该桥的地震响应。多遇地震下采用反应谱分析法对桥墩进行强度验算,罕遇地震下采用时程分析法进行桥墩抗剪验算和极限转角验算。本文对连续刚构桥的地震反应分析得到的有关结论,可为连续刚构桥梁的抗震设计方面提供一定的参考依据。
Abstract: A prestressed concrete continuous rigid frame bridge in a high seismic intensity area is studied. The spatial structure model of a prestressed concrete continuous rigid frame bridge in Yavan high-speed railway section of Indonesia's super-Ⅷ area is established by using MIDAS CIVI finite element software. The dynamic characteristics of continuous rigid frame bridge are calculated and analyzed, and the seismic response of the bridge is analyzed by response spectrum and time history analysis method. Under the earthquake, the response spectrum analysis method is used to check the strength of the pier, and the time limit analysis method is used to check the pier and the limit angle. In this paper, the conclusions of the seismic response analysis of continuous rigid frame bridge can provide some reference for the seismic design of continuous rigid frame bridge.
关键词:连续刚构桥;动力特性;地震响应;反应谱分析法;时程分析法
Key words: continuous rigid frame bridge;dynamic characteristics;seismic response;response spectrum analysis;time history analysis method
中图分类号:U448.23 文献标识码:A 文章编号:1006-4311(2017)32-0101-04
1 项目概况
1.1 桥梁基本情况介绍
本文以某预应力连续刚构桥梁为研究背景。大桥跨径为(45+70+45)m的三跨双薄壁墩连续刚构桥,该桥为左右双幅分离式。箱梁采用直腹板单箱单室结构,梁高沿跨径方向按二次抛物线变化。主桥墩墩高11m、15m。顶板厚度0.43m,腹板厚度0.48~0.80m;底板厚度0.48~0.90m。
1.2 抗震設防标准与重要参数
依据该工程的勘察报告,同时本项目结合国家标准《建筑抗震设计规范》(GB50011-2010)可知,本工程多遇地震的基本水平地震加速度为0.12g,场地设计特征周期0.5s;罕遇地震的基本水平地震加速度0.53g,场地设计特征周期0.55s。国内8度区多遇地震水平地震加速度为0.1g,罕遇地震水平地震加速度为0.57g,本工程多遇地震的基本水平地震加速度超过国内8度区水平地震加速度,罕遇地震的基本水平地震加速度与国内8度区水平地震加速度不一致,因此使用midas civil 2015软件进行分析验算时按地震设防烈度按9(0.4g)计算,手动输入该工程实际的基本水平地震加速度和设计特征周期。……
