Structural health monitoring oriented finite element model of Tsing Ma bridge tower

被引:36
|
作者
Fei, Qing Guo [1 ,2 ]
Xu, You Lin [1 ]
Ng, Chi Lun [1 ]
Wong, K. Y. [3 ]
Chan, W. Y. [3 ]
Man, K. L. [3 ]
机构
[1] Hong Kong Polytech Univ, Dept Civil & Struct Engn, Kowloon, Hong Kong, Peoples R China
[2] SE Univ, Coll Civil Engn, Nanjing 210018, Peoples R China
[3] Highways Dept, Bridges & Struct Div, Hong Kong, Hong Kong, Peoples R China
关键词
structural health monitoring; finite element model; suspension bridge tower; model updating; validation;
D O I
10.1142/S0219455407002502
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
The modeling, updating and validation of a structural health monitoring oriented finite element model (FEM) of the Tsing Ma suspension bridge towers are presented in this paper. The portal-type bridge tower is composed of two hollow reinforced concrete legs and four deep pre-stressed cross-beams with a steel truss cast in the concrete of each cross-beam to form a narrow corridor for access between two legs. Except that steel trusses are modeled by beam elements, all structural components are modeled by solid elements to facilitate local damage detection, in particular at member joints. The established tower model is then updated using sensitivity-based model updating method taking the natural frequencies identified from field measurement data as reference. Furthermore, a two-level validation criterion is proposed and implemented to examine the replication performance of the updated finite element model of the bridge tower in terms of (1) natural frequencies in higher modes of vibration and (2) dynamic characteristics of the tower-cable system. The validation results show that a good replication of dynamic characteristics is achieved by the updated tower model when compared to the field measurement results. Finally, stress distribution and concentration of the bridge tower are investigated through nonlinear static analysis of the tower-cable system.
引用
收藏
页码:647 / 668
页数:22
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