公路桥梁冲击系数计算方法研究  

A Study on Calculation Method of Impacting Force Withstood by Highway Bridges

作　　者：漆景星[1] 

机构地区：[1]长安大学工程设计研究院公路院,西安市710064

出　　处：《公路》2011年第7期85-89,共5页Highway

摘　　要：冲击系数的计算方法对桥梁的安全性很重要。首先对比了目前各国规范对冲击系数的计算公式;然后提出基于数值法的计算方法。采用Newmark-β逐步积分法分解车桥振动系统,结合Ansys有限元软件求出桥梁动力响应,计算冲击系数。通过数值算例表明各国规范冲击系数计算公式所得值差异较大,仅用跨径或者基频计算是不准确的,用更多的修正系数来修正规范公式是比较可行的。The calculation method of impacting force is essential for the security of bridges.Firstly,the formulas of impacting force among the design specifications of bridges are compared;then the method based on numerical analysis is put forward.The Newmark-β method is used to work out the kinematics equation of vehicle-bridge coupled vibration,and the dynamic response of bridges is analyzed by Ansys.Finally,the impacting force is work out.Numerical analysis demonstrates that,the differences among numerical results of the formulas of impacting force are remarked,and the calculation values which only takes spans or fundamental frequency into account are unaccurate;the reseacher suggests that it would be more feasible to modify the formulas of impacting force using more correction coefficients.

关 键 词：桥梁设计 冲击系数 NEWMARK-Β法 修正系数 

分 类 号：U441.2[建筑科学—桥梁与隧道工程]