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一个合理准确的有限元模型是大型桥梁健康监测系统中损伤识别及安全评估、预警的前提。以一座三跨预应力混凝土连续刚构桥为例,根据设计资料,利用ANSYS建立其初始三维有限元模型,利用其健康监测系统采集得到的加速度时程数据,采用随机子空间法对实际结构的模态频率进行识别,依据识别结果,在参数灵敏度分析的基础上,根据最优化理论对该桥的有限元模型进行修正。研究结果表明,经修正后的有限元模型能真实准确地反映该桥梁结构的真实动力特性,可以作为健康监测中损伤识别、安全评估等研究工作的基准模型。
A reasonable and accurate finite element model is the premise of damage identification, safety evaluation and early warning in the large bridge health monitoring system. Taking a three-span prestressed concrete continuous rigid frame bridge as an example, the initial three-dimensional finite element model was established by ANSYS according to the design data. Using the acceleration time history data collected by the health monitoring system, the stochastic subspace method was used to analyze the actual structure Based on the recognition results, based on the sensitivity analysis of the parameters, the finite element model of the bridge is modified according to the optimization theory. The results show that the modified finite element model can truly and accurately reflect the real dynamic characteristics of the bridge structure and can be used as a reference model for the research of damage identification and safety assessment in health monitoring.