Time-varying mechanical properties tracking of in-service cable-stayed bridge based on adaptive model

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (5) : 190-199.

SUN Huahuai1, XU Jun2, CHEN Weizhen2

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Abstract

Due to the complex structure and many influencing factors, the initial finite element model of a cable-stayed bridge cannot accurately reflect the actual structure, and the mechanical properties of cable-stayed bridge continue to deteriorate in service. Therefore, establishing a numerical model reflecting the real state of a cable-stayed bridge is the key to track its time-varying mechanical properties. In this study, a method is proposed to track time-varying mechanical properties of an in-service cable-stayed bridges based on an adaptive model. Firstly, with the measured cable forces at the completion stage, multi-objective optimization method is adopted to update the finite element model of a cable-stayed bridge. Based on the updated finite element model, the step-by-step finite element method is used to numerically track time-varying mechanical properties of an in-service cable-stayed bridge with concrete shrinkage, creep and ambient temperature effects. The proposed method is used to numerically evaluate the time-varying mechanical properties of Haihe Bridge after one and two years of service. The actual mechanical properties of the bridge are inspected regularly. The results show that the relative differences between the numerical results and the measured cable forces after 1 and 2 years of service remain within ±10%. The maximum differences between the numerical results of girder deflections and the measured values are -0.025 m and -0.013 m, separately. Thus, the adaptive model can effectively track time-varying mechanical properties of in-service cable-stayed bridges. In the service stage, the deflection of the main span girder of the hybrid girder cable-stayed bridge gradually increases, and the changes of deflection in the side span girder was very small.

Key words

in-service cable-stayed bridges / time-varying mechanical properties / adaptive model / model updating / concrete shrinkage and creep / ambient temperature

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SUN Huahuai1, XU Jun2, CHEN Weizhen2. Time-varying mechanical properties tracking of in-service cable-stayed bridge based on adaptive model[J]. Journal of Vibration and Shock, 2023, 42(5): 190-199

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