基于广义模式搜索算法的框架结构损伤检测新方法研究

基于单自由度体系推导的统计矩理论,针对无模型方法识别结构损伤距离实际应用差距较大等问题,结合融入广义模式搜索算法,提出一种以融合位移四阶矩和加速度八阶矩为指标的全新框架结构两步层递式快速损伤检测方法。所提广义搜索模式算法结合无模型快速损伤定位理论形成的全新损伤诊断方法,利用融合位移四阶矩和加速度八阶矩作为指标,对12层框架结构数值模型有无噪声工况进行数值模拟,与标准结果偏差均在3%以内,证明了该方法的精确性及抗噪性效果。并与相同指标下的统计矩二范数优化方法和类贝叶斯思想方法进行对比,验证了该新方法相较其他方法在损伤检测精度、稳定程度及快速检测计算时间上的优越性。通过12层标准框架振动台试验数据,选取3个典型工况分别进行损伤诊断,并与实测报告分析对比,其结果表明该方法相对于其他方法更能反映试验工况累积而表现出来的单元损伤程度变化,凸显了新方法在工程检测中的可靠性。

Research on new damage detection method of frame structuresbased on generalized pattern search algorithm

Based on the statistical moment theory derived from the single degree of freedom system, aiming at the large gap betweenidentifying the structure damage with model-free method and the practical application, ineorporates the generalized patterm searchalgorithm,proposes a new two-step hierarchieal rapid damage detection method for frame strueture, which takes fusing thefourth-order displacement moment and the eighth-order aceeleration moment as the index. The generalized pattern search algorithmcombines with the model-free rapid damage location theory to form a new damage deteetion method proposed. The numeriealsimulations of the 12-story frame structure numerical model with or without noise were carried out, and the deviations from thestandard results are all within 3%, which proves the accuracy and the anti-noise effect of this method. This method was comparedwith the two-norm optimization method and the quasi-Bayesian thinking method of statistical moments under the same index, theresults verify the superiority of the new method in accuracy, stability and fast deteetion calculation time of damage detection. Withthe test data of the 12-story standard frame vibration table, three typical working cases were selected for damage diagnosis, and theresults were compared with the actual test report and analyzed, the results show that compared with other methods, this method canrefleet the accumulated damage level change caused by the test working case accumulation better, which highlights the reliability of the new method in engineering detection.