斜拉桥损伤可识别性传感器的优化布置方法

为使布置在斜拉桥上的传感器识别出的模态参数对结构损伤足够敏感，从传感器优化布置的损伤可识别性要求出发，应用参数试验法和参数相关性理论，提出并得到一种包含所有单元损伤信息的节点自由度损伤信息指标，对该指标排序可获得节点自由度包含损伤信息多少的次序，即每个自由度的损伤敏感性排名，此过程无需优化迭代.在此基础上利用传感器优化布置的第1类方法继续分析，避免了迭代或优化效率低下等缺陷，可得到既满足损伤可识别性，也满足模态可观测性的传感器布置位置.在单塔双索面斜拉桥上，展示了本文方法的实现过程，与EI（effective independence）法相比，损伤信息总量:3阶时高出589；4阶时高出582；5阶时高出591. 

Optimum Sensor Placement Method for Cable-Stayed Bridges Based on Damage Identifiability

In order to make the modal parameters identified by the sensors on cable-stayed bridges that are sufficiently sensitive to structural damage, a damage information index of the node degree of freedom containing the damage information of all elements was proposed and obtained, considering the damage identifiability requirements for optimum sensor placement, and using the method of parameter study and parameter correlation theory. The damage information regarding the degrees of freedom of the nodes could be ordered by ranking the index, i.e. by ranking the damage sensitivity of each degree of freedom. This process did not require the use of any optimization iterative algorithm. Based on this proposal, the first such method for optimum sensor placement, which can avoid defects such as inefficient iterations and optimization, could be analysed. Finally, the location of the sensor, which could provide satisfactory damage identifiability and modal observability, was obtained. The feasibility of the proposed method was demonstrated using a single-tower double-cable-plane cable-stayed bridge. A comparison of the results with those obtained using the EI method (effective independence method) revealed that the total damage information obtained using the proposed method is greater by factors of 589, 582, and 591 for the 3rd, 4th, and 5th orders, respectively.