基于响应灵敏度分析的桥梁结构损伤和车辆参数的识别

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振动与冲击 ›› 2016, Vol. 35 ›› Issue (9) : 168-171.

论文

张春丽1，吕中荣2

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Simultaneous identification of damage and vehicular parameters based on dynamic response sensitivity analysis

CHunli ZHANG1 ZHongrong LV2

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摘要

本文基于响应灵敏度分析利用车-桥耦合系统的加速度响应进行桥梁结构的局部损伤和车辆参数识别。在正问题中建立了连续桥梁结构和车辆耦合系统的有限元模型，利用Newmark 直接积分法求出在移动车载作用下系统的动态响应，并进一步推导出动态响应对系统物理参数的时域响应灵敏度。在反问题中利用该响应灵敏度矩阵进行系统的有限元模型修正，识别出桥梁的局部损伤和车辆参数，讨论了人工噪声对识别结果的影响。算例表明本文方法具有精度高、对测量噪声不敏感等特点。

Abstract

This paper attempts to identify both local damages in bridge deck and the parameters of the moving vehicles from the dynamic responses induced by vehicles moving on top of the bridge deck. The local damage is simulated by a reduction in the elemental flexural rigidity of the beam. In the forward analysis, the coupled bridge-vehicle systems are established using the finite element analysis and the dynamic responses of the system are obtained from Newmark direct integration method. In the inverse analysis, a dynamic response sensitivity-based finite element model updating approach is used to identify both local damages of the bridge deck in the element level and the parameters of the vehicles. The solution is obtained iteratively with the penalty function method with regularization from the measured structural dynamic responses. A multi-span continuous beam is studied as numerical example to illustrate the correctness and efficiency of the proposed method. The effects measurement noise, and measurement time duration on the identification results are investigated. Studies in this paper indicate that the proposed method is efficient and robust for both damage identification and vehicular parameter identification. Good identified results can be obtained from the time histories of several measurement points.

关键词

车-桥耦合 / 损伤识别 / 响应灵敏度 / 模型修正

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张春丽1，吕中荣2 . 基于响应灵敏度分析的桥梁结构损伤和车辆参数的识别[J]. 振动与冲击, 2016, 35(9): 168-171

CHunli ZHANG1 ZHongrong LV2 . Simultaneous identification of damage and vehicular parameters based on dynamic response sensitivity analysis[J]. Journal of Vibration and Shock, 2016, 35(9): 168-171

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