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本文基于山东滨州黄河公路大桥,建立面向结构健康监测的实验室模型试验平台。基于相似理论,分析模型相关参数的相似关系,确定模型缩尺比、材料和截面尺寸,并对模型附加质量和斜拉索进行合理地简化。采用ANSYS建立物理模型的三维空间实体有限元数值分析模型,实体建模能较好的体现模型局部特征和模拟损伤。模型制作采用分段整体浇注,分段之间设计连接件连接,模拟斜拉桥施工顺序进行实验室组装,基于影响矩阵法对斜拉索进行张拉成桥。建立了包括传感器系统、静动力加载系统、数据采集系统和数据处理四大部分的完整试验体系,并对隔离出的桥塔和桥面板子结构进行了静动力试验,对全桥模型进行了动力测试。子结构和全桥模型的试验结果与有限元计算结果,以及原桥实测值都吻合较好,验证了斜拉桥模型的准确性和试验平台的有效性。试验系统的建立,为结构健康监测技术提供了一个试验研究平台。
Based on Shandong Binzhou Yellow River Highway Bridge, this paper establishes a laboratory model test platform for structural health monitoring. Based on the similarity theory, the similarity of model parameters was analyzed to determine the scale ratio, material and cross-sectional size of the model, and to reasonably simplify the added mass of the model and the stay cable. Using ANSYS to establish a three-dimensional solid finite element numerical analysis model of physical model, solid modeling can better reflect the local characteristics of the model and simulate the damage. The model was made by segmented whole casting, the connection between the sections was designed, and the construction sequence of the simulated cable-stayed bridge was assembled in the laboratory. Based on the influence matrix method, the tension cable was tensioned into a bridge. A complete test system including four parts of sensor system, static and dynamic loading system, data acquisition system and data processing is established. Static and dynamic tests are carried out on the isolated pylons and decks, and the full-bridge model is powered test. The test results of the substructure and full bridge model are in good agreement with the finite element calculation results and the measured values of the original bridge, which verifies the accuracy of the cable-stayed bridge model and the validity of the test platform. The establishment of the experimental system provides an experimental research platform for structural health monitoring technology.