基于响应面方法的桥梁静动力有限元模型修正  

Static and Dynamic Bridge Finite Element Model Updating Based on Response Surface Method

作　　者：魏锦辉[1,2] 任伟新[1] 

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]郑州航空工业管理学院,河南郑州450015

出　　处：《公路交通科技》2015年第2期68-73,共6页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(51278163)

摘　　要：提出了一种基于响应面方法的桥梁静动力有限元模型修正技术,并成功地应用到了常德市白马湖公园虹桥的有限元模型修正当中。利用结构静载位移和振动频率等现场实测静动力响应,构造联合静动力的结构有限元模型修正的目标函数,在相关指标灵敏度分析的基础上筛选待修正参数,并利用响应面方法拟合桥梁静动力响应的代理模型。最后利用响应面替代模型(Meta-model)对该桥进行有限元模型修正,使得桥梁响应的实测值与计算值达到较好的吻合程度,经过修正后的有限元模型能够反映该斜拉桥的静动力特性,可以作为该桥的基准有限元模型。Based on response surface method, a new technique for bridge finite element model updating using both static and dynamic response is proposed, and it is applied to the Hong bridge in White Horse Lake Park in Changde City successfully. Field measured structural static and dynamic response such as static load displacement and vibration frequency of the structure are utilized together to form the objective function for static and dynamic response structural FE model updating, the parameters to be updated are selected according to sensitivity analysis of relevant indicators, and a substitute model of bridge static and dynamic response is developed via response surface method. At last, a meta-model which developed via response surface method is used for updating the FE model of the bridge to achieve a good agreement between the measured and calculated responses of the bridge. The updated model can reflect the static and dynamic characteristics of this cable-stayed bridge and serves as its baseline FE model.

关 键 词：桥梁工程 桥梁结构 有限元模型修正 静动力响应 响应面方法 参数选择 

分 类 号：U441.2[建筑科学—桥梁与隧道工程]