利用模态应变能指标的斜拉桥拉索损伤识别

• 作 者: 董晓马 孙庆珍 李广慧
• 机 构: 郑州航空工业管理学院,
• 出 处: 武汉大学学报(工学版)
• 发表日期: 2009年06期
• 关键词: cable damage cable-stayed bridges modal strain energy

由于拉索是大跨度斜拉桥的主要承重构件之一,拉索中的损伤对于大跨度斜拉桥结构的安全会产生不利的影响.为实现对斜拉桥拉索损伤识别确保结构的安全,首先给出单元模态应变能定义,然后分析了基于单元模态应变能的损伤识别机理,提出了基于单元模态应变能变化率斜拉桥拉索损伤识别的实用方法,并以国内某重点斜拉桥为试验对象模拟3种不同的损伤工况情况,研究该方法的适用性.试验研究结果表明,单元模态应变能变化率指标是斜拉桥拉索损伤很好的敏感标识量,对单位置拉索损伤能够准确地给予识别,对于多位置拉索损伤识别,指标也能给予较好识别效果.该方法为斜拉桥拉索损伤检测提供了一条可靠有效的途径.

As the cable is one of the main load-bearing components of the long-span cable-stayed bridge, the damage in the cable will have an adverse effect on the safety of the long-span cable-stayed bridge structure.In order to realize the cable damage identification of the cable-stayed bridge and ensure the safety of the structure First, the definition of modal strain energy is given. Then, the damage identification mechanism based on the modal strain energy of the unit is analyzed, and a practical method of cable damage identification based on the modal strain energy change rate cable stayed bridge is proposed. The key cable-stayed bridge simulates three different damage conditions for the test object and studies the applicability of the method.The experimental results show that the rate of change of unit modal strain energy is a sensitive indicator of cable damage of cable-stayed bridge , Which can accurately identify the cable damage in a single location, which can also give better identification results for multi-location cable damage identification.This method provides a reliable and effective way for cable damage detection of cable-stayed bridge.