东南大学学报（英文版）2008，Vol.24Issue(1)：80-84,5.
基于GPS的叠合梁斜拉桥双层模型修正方法
Double-layer model updating for steel-concrete composite beam cable-stayed bridge based on GPS
摘要
Abstract
In order to establish the relationship between the measured dynamic response and the health status of long-span bridges,a double-layer model updating method for steel-concrete composite beam cable-stayed bridges is proposed.Measured frequencies are selected as the first-layer reference data,and the mass of the bridge deck, the grid density,the modulus of concrete and the ballast on the side span are modified by using a manual tuning technique. Measured global positioning system (GPS) data is selected as the second-layer reference data,and the degradation of the integral structure stiffness EI of the whole bridge is taken into account for the second-layer model updating by using the finite element iteration algorithm.The Nanpu Bridge in Shanghai is taken as a case to verify the applicability of the proposed model updating method.After the first-layer model updating,the standard deviation of modal frequencies is smaller than 7%.After the second-layer model updating,the error of the deflection of the mid-span is smaller than 10%.The integral structure stiffness of the whole bridge decreases about 20%.The research results show a good agreement between the calculated response and the measured response.关键词
叠合梁/GPS/动响应/双层模型修正Key words
steel-concrete composite beam/GPS/dynamic response/double-layer model updating分类
交通工程引用本文复制引用
刘云,钱振东..基于GPS的叠合梁斜拉桥双层模型修正方法[J].东南大学学报（英文版）,2008,24(1):80-84,5.基金项目
The Special Project of the Ministry of Construction of China (No.20060909). （No.20060909）
