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Open Access

ARTICLE

Cable-Stayed Bridge Model Updating Based on Response Surface Method

Yao Lu, Xintong Huo, Guangzhen Qu, Yanjun Li, Lei Wang*
School of Civil Engineering and Architecture, University of Jinan, Jinan, 250022, China
* Corresponding Author: Lei Wang. Email: email
(This article belongs to the Special Issue: Sensing Data Based Structural Health Monitoring in Engineering)

Structural Durability & Health Monitoring https://doi.org/10.32604/sdhm.2025.062537

Received 20 December 2024; Accepted 07 February 2025; Published online 19 March 2025

Abstract

A response surface method was utilized for the finite element model updating of a cable-stayed bridge in this paper to establish a baseline finite element model (FEM) that accurately reflects the characteristics of the actual bridge structure. Firstly, an initial FEM was established by the large-scale finite element software ANSYS, and the modal analysis was carried out on the dynamic response measured by the actual bridge structural health monitoring system. The initial error was obtained by comparing the dynamic characteristics of the measured data with those of the initial finite element model. Then, the second-order complete polynomial was selected to construct the response surface model; the corrected parameters were chosen using the sensitivity method. The response surface model (RSM) was fitted under the test cases designed using the central composite design method. After constructing the objective function, the RSM was optimized and iterated by the sequential quadratic programming method to obtain the corrected FEM. Finally, the dynamic characteristics of the modified FEM were compared with those of the actual bridge to get the final error. The results show that the modified FEM simulates the dynamic characteristics of the actual cable-stayed bridges more accurately.

Keywords

Finite element model updating; structural health monitoring system; central composite design; response surface model

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