摘要
针对复杂桥梁的车桥耦合振动数值分析,提出了采用既有有限元通用分析软件ANSYS实现公路复杂桥梁车桥耦合振动的计算方法,即把车辆和复杂桥梁视作两个分离子体系,分别应用广义虚功原理和有限元法,推导了两者的各自振动方程组;通过位移协调方程及车桥相互作用联系方程,把车桥振动耦合起来,建立了车桥耦合振动方程;最后通过ANSYS实现.数值算例表明,该方法仅经3次迭代即可获得较高精度及可靠的数值结果.并与连续梁按规范给定的基频估算值计算的冲击系数进行对比,两者基本吻合,从而为公路复杂桥梁(如曲线连续梁等)动力性能评价提供了一种方便可靠的数值分析方法.
A computational method for numerical analysis of vehicle-bridge coupled vibration for complicated bridges with the existing common finite element analysis software ANSYS has been put forwand. The vehicle and bridge are considered as two separate subsystems in the method, and the generalized virtual work principle and finite element method are applied, respectively, to derivation of the vibration equation sets for vehicle and bridge. By coupling of vehicle vibration and bridge vibration with compatibility equations of displacement and contact equations of vehiclebridge interaction, equations of vehicle-bridge coupled vibration are established and the implemented with ANSYS. Numerical analysis shows that, with iterations for only three times, the results with higher accuracy and reliability are achieved, which are in good agreement with impact factor calculated with the fundamental frequency of continuous beam bridges given by code. The method proposed provides a convenient and reliable numerical analysis approach to dynamic performance evaluation of complicated bridges such as curved continuous beam bridges.
出处
《天津大学学报》
EI
CAS
CSCD
北大核心
2010年第6期537-543,共7页
Journal of Tianjin University(Science and Technology)
关键词
车桥耦合振动
有限元法
复杂桥梁
数值分析方法
冲击系数
vehicle-bridge coupled vibration
finite element method
complicated bridge
numerical analysis method
impact factor
