作　　者： ; ; (杨小森）; (李晓民）;

机构地区： 甘肃省交通规划勘察设计院有限责任公司甘肃兰州730030

出　　处： 《公路交通科技》 2013年第12期99-106,共8页

摘　　要： 为了提高结构损伤识别的精度和计算效率,提出了一种基于结构振动信号的统计特征的损伤识别方法。该方法直接从测试信号中提取时域特征信息,而无需将信号变换到频域中。与频域方法相比,既简化了复杂的运算过程,又降低了测量噪声对识别结果的干扰。在推导了白噪声激励下结构各测点位移响应间的统计特性(相关系数)的基础上,证明了振动信号统计特征中包含了结构的模态信息,进而为使用结构振动信号的统计特征作为损伤识别指标提供了依据。理论分析结果还表明结构响应信号的统计特征有很好的抗噪性。最后以某一连续梁桥为例进行了数值仿真模拟,计算结果表明,白噪声激励下结构位移响应间回归系数的变化能很好的反应结构损伤位置和程度。 In order to improve the precision and computation efficiency of structural damage identification, a structural damage identification method based on statistical characteristic of vibration signal is given. The characteristic of time domain information could be directly extracted from the measured signal without frequency domain transformation. Compared with the frequency domain method, the complicated operation process can be simplified, and the measurement noise interference on the results can be reduced. Based on derivation of the statistical characteristic （correlation coefficient ） of vibration signals between each displacement response of measuring points under white noise excitation, the fact that the statistical characteristic contain structural modal information is proved, which could be the foundation for statistical characteristic as the damage taking the detection index. The theoretical analysis result also shows that the statistical characteristic of structure response signal has another advantage of satisfactory noise immunity. Based on the simulation for a continuous beam bridge, the calculation result shows that the variation of regression coefficient between each displacement response under white noise excitation could well identify the damage location and extension

关 键 词： 桥梁工程 损伤识别 统计特征 相关系数 振动特性 白噪声

领　　域： [建筑科学] [交通运输工程]