基于响应面的刚构-连续组合梁桥有限元模型静动力修正  

Response Surface Based Finite Element Model Updating for a Rigid Frame Continuous Composite Girder Bridge Using Static and Dynamic Test Data

作　　者：韩建平[1,2] 骆勇鹏[1,2] 

机构地区：[1]兰州理工大学甘肃省土木工程防灾减灾重点实验室,甘肃兰州730050 [2]兰州理工大学防震减灾研究所,甘肃兰州730050

出　　处：《公路交通科技》2013年第11期53-61,共9页Journal of Highway and Transportation Research and Development

基　　金：甘肃省科技攻关项目(2GS057-A52-008);甘肃省交通运输厅科研计划项目(2010-19)

摘　　要：提出一种联合运用静动力测试数据、基于响应面的桥梁结构有限元模型静动力修正方法,并利用一刚构-连续组合梁桥———靖远黄河大桥的现场测试数据对其有限元模型进行了修正。其中,试验设计分别采用中心复合设计和D-最优设计,2种试验设计方法得到的有限元模型修正结果对比表明,不同的试验设计方法对修正精度的影响较小,但对修正后参数的取值有较大影响。联合运用静动力测试数据进行有限元模型修正,修正后的计算频率与实测频率更加吻合,偏差在3%以内,修正后结构计算挠度和实测挠度偏差基本在7%以内,而仅利用动力测试数据修正结构的计算挠度和实测挠度偏差基本在15%以上。上述结果表明,联合运用静动力测试数据修正后的有限元模型能更准确地模拟实际桥梁结构的力学性能。A response surface based finite element model updating of bridge using static and dynamic test data simultaneously is proposed, and the finite element model of a rigid frame continuous girder bridge, Jingyuan Yellow River Bridge, is updated based on the in-situ test data. Both central composite design and D-optimal design are adopted to design the experiment respectively. Comparison of Updated results using the 2 experiment design methods shows that different experiment design methods have less influence on the updating precision, but have a great influence on the final updated parameters. By updating the finite element model based on static and dynamic test data simultaneously, the frequency from the updated model is in better agreement with the in-situ measurement, and the deviation between the identified frequencies from in-situ test and analytical frequencies from the updated models based on static and dynamic test data simultaneously is less than 3 %. The deviation between the measured deflection values and the analytical deflection values from the updated model is mostly less than 7%, while the deflection deviation from the updated model based on dynamic test data only is mostly larger than 15%. These results indicate that the updated finite element modelbased on using static and dynamic test data simultaneously can simulate the mechanical property of bridge more accurately.

关 键 词：桥梁工程 刚构-连续组合梁桥 有限元模型修正 响应面法 中心复合设计 D-最优设计 静动力测试 

分 类 号：U448.231[建筑科学—桥梁与隧道工程]