叉形桥梁的动力特性理论分析及模拟研究  

ANALYSIS AND SIMULATION OF DYNAMIC BEHAVIOR FOR A Y-SHAPE BRIDGE

作　　者：卢彭真[1] 张俊平[2] 赵人达[1] 

机构地区：[1]西南交通大学土木工程学院,成都610031 [2]广州大学土木工程学院,广州510006

出　　处：《振动与冲击》2008年第4期159-163,共5页Journal of Vibration and Shock

基　　金：教育部优秀青年教师基金项目(教人司[2000]11号)

摘　　要：叉形桥梁结构行为复杂,影响结构动力特性的因素较多,为较好把握其受力行为,有必要对叉形桥梁结构进行动力特性的研究。通过空间梁格的分析方法对典型叉形桥梁进行简化离散,然后基于通用有限元软件SAP2000,采用不同的支座形式对典型叉形桥梁结构的振动频率及振型进行了模拟分析,并讨论了主要结构参数对其动力特性的影响。研究结果是叉形桥梁结构基频为竖弯,不同支座设置对结构上部的动力特性影响显著,建议在设计时采取适当的措施提高横向刚度,确保结构的安全运营。Structural behavior of a Y-shape Bridge is complex,and there are lots factors to influence its dynamical property.In order to clarity its structural behavior,it is necessary to study the Y-shape bridge dynamical property.A typical Y-shape bridge structure is simplified and discreted using space grillage analysis method.Then,using finite element software SAP2000,its vibration frequencies and modal shapes are analyzed with different bearing forms,and effects of the main structural parameters on its dynamic behavior are discussed.The results indicate that the first vibration component of the Y-shape bridge is a bending one in vertical direction,and different bearing forms have large affects on the dynamical property of the structure,and enhancing the structural stiffness is suggested to ensure the safety of the structure.

关 键 词：叉形桥梁结构 振型与频率 梁格理论 

分 类 号：U441[建筑科学—桥梁与隧道工程] TU311.3[交通运输工程—道路与铁道工程]