结构损伤识别的改进曲率模态方法

结构损伤识别是结构健康监测和结构状态评估的主要前提之一。尽早了解结构的损伤状况和损伤位置有助于提高结构的预期可靠性和安全性,同时降低了结构的维修费用。论文主要研究了如何采用改进的曲率模态方法识别结构的损伤以提高识别精度。基于曲率模态对结构局部损伤比较敏感和频率指标测试简单方便、精度高的特点,论文提出了一种以结构的曲率模态为基础,综合考虑频率变化的改进曲率模态识别结构损伤位置的方法。最后用一数值模拟的简支混凝土梁对该方法与曲率模态方法进行了对比验证。结果表明,改进的曲率模态方法能够更精确地识别出结构的损伤位置。

Structural Damage Identification by Improved Curvature Mode

Structural damage identification is one of the major premises in the structural health monitoring and the structural condition assessment.Early detection of the damage and its localization can help improve the expected reliability and safety of the structure,and also reduce the maintenance cost.This paper presents a research of the structural damage identification by the improved curvature mode so as to improve the damage identification accuracy.Due to the more sensitivity of the curvature mode to the structural local damage,the easy test of the frequency index and the high precision of the test,this paper presents a method of improving the structural damage identification based on the structural curvature mode and the frequency change.Finally,a numerical modelling simple support concrete beam is presented to make a comparison between the improved method and the curvature method.The results show that the improved curvature modal can effectively identify the damage location of the structure.