摘要
本文为确定等跨连续梁桥的冲击系数,根据结构静力分析,求取边跨及中跨跨中挠度静力响应;基于结构动力学原理,分别建立车辆与桥梁的动力方程,采用五轴十三自由度平面车辆模型,三跨连续梁桥模型,建立车桥耦合振动方程,采用ANSYS和MATLAB软件编译等跨连续梁桥车桥耦合分析模块,迭代求解边跨及中跨跨中挠度动力响应;再依据冲击系数计算公式求出边跨及中跨冲击系数,确定桥面不平整度、速度、基频和载重这4个因素为影响因素,利用SPSS (statistical package for the social sciences)数值分析软件进行逐步回归,得到了各参数对冲击系数的显著程度,给出等跨连续梁桥挠度冲击系数计算公式。结果表明:桥面不平整度与挠度冲击系数的相关性较好,而速度、基频和载重对挠度冲击系数的线性相关较为不显著;回归分析结果显示,桥面不平整度与冲击系数之间的标准化相关系数Beta达到0.908,表明桥面不平整度对连续梁桥的冲击系数具有重要影响。然而,现行规范未考虑到这一因素,因此建议在后续规范修订中纳入桥面不平整度的影响。
To determine the impact coefficient of an equal span continuous beam bridge;Based on structural static analysis,calculate the deflection static response of the side span and mid span,dynamic equations for vehicles and bridges are established based on the principles of structural dynamics,using a five axis thirteen degree of freedom planar vehicle model and a three span continuous beam bridge model,the vehicle bridge coupling vibration equation is established,ANSYS and MATLAB software are used to compile the vehicle bridge coupling analysis module of the same span continuous beam bridge,iteratively solving the deflection dynamic response of the side span and mid span;Calculate the impact coefficients for the edge span and mid span based on the impact coefficient calculation formula.The main influence factor are determined to be the unevenness of the bridge deck,speed,fundamental frequency,and load,SPSS(statistical package for the social sciences)numerical analysis software is used for stepwise regression to obtained the significance of each parameter on the impact coefficient,and a formula for calculating the deflection impact coefficient of an equal span continuous beam bridge is provided.The results show that there is a good correlation between the unevenness of the bridge deck and the deflection impact coefficient,while the linear correlation between speed,fundamental frequency,and load on the deflection impact coefficient is not significant;The regression analysis results show that the standardized correlation coefficient Beta between bridge deck unevenness and impact coefficient reaches 0.908,indicating that bridge deck unevenness has an important impact on the impact coefficient of continuous beam bridges.However,the current regulations have not taken this factor into account,so it is recommended to include the impact of bridge deck unevenness in subsequent revisions of the regulations.
作者
杨美良
李文慧
李振国
李涛
Yang Meiliang;Li Wenhui;Li Zhenguo;Li Tao(School of Civil Engineering,Changsha University of Technology,Changsha 410114,China)
出处
《科技通报》
2025年第1期84-90,共7页
Bulletin of Science and Technology
基金
国家自然科学基金(51878073)
湖南省教育厅重点科学研究(21A0213)。
关键词
冲击系数
数值模拟
逐步回归
桥面不平整度
impact coefficient
numerical simulation
gradual regression
bridge deck unevenness
