【摘要】 由于建模和分析过程中的众多不确定因素,有限元分析预测的响应与实际结构响应不可避免地存在偏差,因此必须对有限元模型进行修正.文中提出了一种基于不同残差的桥梁结构模型修正方法,介绍了频率残差和振型残差的概念,目标函数的确定和设计参数的选择方法.对一根简支梁进行了仿真分析,结果表明该方法简单可行.基于振动测试数据,对一个桥梁工程实例进行模型修正,修正后的桥梁有限元模型的动力特性更加趋近现场振动测试值.更多还原

【Abstract】 Because of the uncertainty in the process of modeling and analysis,there are inevitably differences between structural responses obtained by FEM and test in site,that is,the FEM needs to be updated.In the paper,a method of bridge structure model updating based on different residuals is presented.Firstly,the concepts of frequency residual and mode shapes residual are introduced,the determination of objection function and selection methods of updated parameters are emphatically investigated.Secondly,a simulated simply supported beam is analyzed,it is clearly seen that the proposed method is simple and applicable.Finally,a road bridge is used to verify the feasibility of the method for actual structures,the results show that the dynamic characteristics of the updated FEM is closer to test ones.更多还原