整体式桥台曲线箱梁桥的动力特性研究  

Research on Dynamic Characteristics of Integral Abutment Curved Box Girder Bridge

作　　者：彭大文[1] 罗朝专[2,3] 林志平[1,3] 

机构地区：[1]上海应用技术学院土木建筑与安全工程学院,上海200235 [2]中广核工程有限公司宁德分公司,福建福鼎355200 [3]福州大学土木工程学院,福建福州350002

出　　处：《公路交通科技》2010年第2期54-59,90,共7页Journal of Highway and Transportation Research and Development

基　　金：上海市科委重点资助项目(08230511400);上海市教委重点学科建设项目(J51502)

摘　　要：针对整体式桥台曲线箱梁桥的结构特点,运用结构分析软件ANSYS的APDL语言实现多模态反应谱法的自动迭代,以简化该类桥梁的动力特性分析。对该类桥梁的计算模型及影响其动力特性的主要参数进行了分析,通过动态时程分析法比较了迭代多模态反应谱法的可行性和准确性。结果表明:该类桥梁不存在纯粹某一方向的振型;1阶横弯、1阶纵弯和3阶竖弯分别对横、纵和竖向的振型贡献最大;1阶横弯和1阶纵弯频率受台后土及桩侧土密实度的影响最大,其次是地震激励频率和桥宽;3阶竖弯频率基本不受各种参数的影响;迭代多模态反应谱法可以作为该类桥梁抗震计算的一种估算手段。In order to simplify analysis of the dynamic characteristics of the integral abutment curved box girder bridge, automatic iteration of the multimode modal response spectrum （MMRS） was realized byAPDL language of the structure analysis software ANSYS according to the bridge＇ s structural characteristics. The computation model and the main parameters influencing dynamic characteristics of the bridge were discussed. The availability and precision of the iterative MMRS method were examined by the time-history analysis. The result shows that （1） there is no pure modal shape in a certain direction; （2） 1 st order transverse bending, 1 st order longitudinal bonding and 3rd order vertical bonding are most contribution to respective modes; （3） vibration frequencies of 1st order transverse bonding and 1st order longitudinal bonding are most influenced by compactness of back-abutment and pilearound soil, frequency of seismic excitation and the width of bridge are the next influencing parameters; （4） diversified parameters effect on frequency of 3rd order vertical bending rarely. The feasibility and veracity of the iterative MMRS are validated by the time-history analysis. The iterative MMRS can be used as an estimating method of seismic analysis for the bridge.

关 键 词：桥梁工程 动力特性 迭代多模态反应谱法 整体式桥台 曲线箱梁桥 

分 类 号：U441.2[建筑科学—桥梁与隧道工程] U448.213[交通运输工程—道路与铁道工程]