基于有限元修正的斜拉桥健康监测传感器优化布置研究

Study on Optimal Placement of Sensors for Health Monitoring of a Cable-stayed Bridge Based on the FEM Updating

以某座斜拉桥为工程背景,首先介绍了基于结构动力特性的传感器优化布置方法,并采用序列法通过多模态的组合对测点进行了优化,在此基础上结合桥梁结构特点和监控需求,提出了优化的传感器布置方案。其次,建立该桥的三维有限元修正模型,获取该桥的动力特性。再次,以振型参与质量系数和MAC矩阵标准为理论基础,对各组合下的模态向量矩阵进行优化布点处理,对桥梁健康监测传感器布点方案进行了研究。最后结合该桥的实际情况,提出传感器优化布置方案。

Take a cable-stayed bridge as engineering background. Firstly, introduced the optimal placement of sensors based on the structural characteristics, optimied the measuring points through a combination of the model using ordination, the optimal placement scheme of sensors was presented combining with the bridge charncter ristics of structure and demand. Secondly, the three-dimensional finite element updated of the cable-stayed bridge was constructed, and the dynamic characteristics of the bridge were extracted. Thirdly, the modal matrices of different combination were being optimal placed based on the theorectical basis of the stand participation mass radio and the MAC matrix modal. Finally, presented the optimal placement scheme of sensors was presented according to the real damage condition of the bridge.