基于自适应模型的在役斜拉桥时变力学性能追踪

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摘要由于结构复杂、影响因素众多，斜拉桥初始有限元模型不能准确反映实际结构，且服役阶段斜拉桥力学性能持续退化。因此，建立反映斜拉桥真实状态的数值模型是追踪其时变力学性能的关键。故本研究提出基于自适应模型的在役斜拉桥时变力学性能追踪方法。首先根据成桥时拉索实测索力，采用多目标优化法修正斜拉桥成桥时有限元模型。基于修正后的成桥有限元模型，考虑服役阶段混凝土收缩、徐变和环境温度效应，采用有限元逐步分析法数值追踪在役斜拉桥时变力学性能。利用所提出的方法数值评估海河大桥服役1年和2年后时变力学性能，并对该桥实际力学性能进行周期性现场检测。研究结果表明，服役1年和2年后，全桥索力数值结果与现场检测值的相对差异始终保持在10%之内，主梁挠度数值结果和实测值最大差异分别为-0.025 m和-0.013 m。因此，斜拉桥自适应模型能够有效地追踪在役斜拉桥时变力学性能。在服役阶段，该混合梁斜拉桥主跨主梁挠度逐渐增大，边跨主梁挠度变化很小。

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	孙华怀1
	徐俊2
	陈惟珍2

关键词 ：在役斜拉桥, 时变力学性能, 自适应模型, 模型修正, 收缩徐变, 环境温度

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

收稿日期: 2022-06-16 出版日期: 2023-03-15

引用本文:

孙华怀1，徐俊2，陈惟珍2. 基于自适应模型的在役斜拉桥时变力学性能追踪[J]. 振动与冲击, 2023, 42(5): 190-199.
SUN Huahuai1, XU Jun2, CHEN Weizhen2. Time-varying mechanical properties tracking of in-service cable-stayed bridge based on adaptive model. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(5): 190-199.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2023/V42/I5/190

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