基于健康监测的斜拉桥基准模型研究

发布时间：2019-01-18 18:41

【摘要】：近年来斜拉桥的健康监测与安全评估已经成为一个热点问题,越来越多的学者和专家都加入到这个领域研究中,而斜拉桥有限元基准模型的建立则是对斜拉桥进行健康监测和安全评估的基础和前提。为了对桥梁的工作状态进行实时分析和健康监测,需要建立一个能反映桥梁真实性能的“基准模型”,因此如何建立一个能够真实反映桥梁成桥无损状态下的“基准模型”变得尤为重要。另外,由于突发事故、超载、地震以及环境因素等对桥梁结构的影响比较复杂,因此需要掌握桥梁整体工作状态的变化以便对其进行实时监测。这些监测工作具有重要的工程意义,因为它可以降低灾难事故的发生概率,具体手段包括:必要的结构加固、改造或维修工作。为了更好地解决上述问题,本文以芜湖长江大桥斜拉桥为例,基于有限元分析软件ANSYS,建立了斜拉桥的初始有限元模型,通过对初始有限元模型修正及修正后模型计算值与试验值对比验证,最终确定修正后的模型可以作为桥梁健康监测的“基准模型”。本文主要分为以下几点内容:(1)根据设计图纸尺寸及材料性质建立初始有限元模型;(2)对初始有限元模型的拉索索力和桥面线形进行修正得到该桥的初始平衡构型,使有限元模型的理论计算结果能准确地描述桥梁的结构状态;(3)对有限元模型进行动静载分析,通过试验对比选取合理的参数对模型进行修正,并结合动静载试验数据确认“基准模型”的可靠性。通过对初始模型的修正得到斜拉桥的“基准模型”,利用此“基准模型”监测结构的实际工作状态,以便及时对斜拉桥结构进行养护和维修。
[Abstract]:In recent years, health monitoring and safety assessment of cable-stayed bridges have become a hot issue, and more scholars and experts have joined the research in this field. The establishment of finite element benchmark model of cable-stayed bridge is the foundation and premise of health monitoring and safety assessment of cable-stayed bridge. In order to carry on the real-time analysis and the health monitoring to the bridge's working state, it is necessary to establish a "benchmark model" which can reflect the real performance of the bridge. Therefore, it is very important to establish a "benchmark model" which can truly reflect the non-destructive state of the bridge. In addition, the influence of sudden accident, overload, earthquake and environmental factors on the bridge structure is complex, so it is necessary to master the change of the overall working state of the bridge in order to monitor it in real time. These monitoring tasks are of great engineering significance because they can reduce the probability of disaster accidents, including necessary structural strengthening, modification or maintenance work. In order to solve the above problems better, this paper takes the cable-stayed bridge of Wuhu Yangtze River Bridge as an example, and establishes the initial finite element model of the cable-stayed bridge based on the finite element analysis software ANSYS,. The modified model can be used as the "benchmark model" for bridge health monitoring by comparing the initial finite element model and the calculated value of the modified model with the experimental data. The main contents of this paper are as follows: (1) the initial finite element model is established according to the size and material properties of the design drawings; (2) the initial equilibrium configuration of the bridge is obtained by modifying the cable force of the initial finite element model and the line shape of the bridge deck, so that the theoretical calculation results of the finite element model can accurately describe the structural state of the bridge; (3) dynamic and static load analysis of finite element model is carried out, and reasonable parameters are selected to modify the model through test comparison, and the reliability of "benchmark model" is confirmed by combining static and dynamic load test data. The "datum model" of cable-stayed bridge is obtained by modifying the initial model. The "benchmark model" is used to monitor the actual working state of the structure in order to maintain and maintain the cable-stayed bridge structure in time.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U446

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