基于地震观测数据的结构损伤水平表征参数研究

Research on characteristic parameters of structural damage level based on seismic observation data

为了能在震后更好地利用测得的结构动力响应参数快速对结构损伤程度进行评估,文中挑选了最大层间位移角、自振频率相对改变量和顶层加速度放大系数3个参数,分析结构损伤指数与3个参数之间的相关性,并且提出了一种组合结构体系参数。结果表明,结构损伤指数与最大层间位移角的相关性为高度相关,与自振频率相对改变量和顶层加速度放大系数的相关性均为中度相关。但由于目前地震后难以准确地获得结构的最大层间位移角数据,因此基于自振频率相对改变量与顶层加速度放大系数给出了一种组合结构体系参数,分析结果表明其与结构损伤指数相关性优于组合前的2个单参数,能较好地预测结构震后损伤水平。研究结果可为建筑工程地震风险监测和震后损伤快速评估提供分析模型。

In order to make better use of the measured structural dynamic response parameters for rapid assessment of structural damage after an earthquake.In this paper,three parameters,namely,the maximum inter-story drift,the relative frequency change,and the acceleration amplification coefficient of the top floor,are selected to analyze the correlation between the structural damage index and the three parameters.And a combined structural system parameter is proposed.The results show that the correlation between the structural damage index and the maximum interlayer displacement angle is highly correlated,and the correlation with the relative frequency change and the acceleration amplification coefficient of the top floor is moderately correlated.However,as it is difficult to obtain the maximum inter-story drift accurately after the earthquake,the combined structural system factors based on the relative frequency change,and the acceleration amplification coefficient of the top floor are proposed,and the anal⁃ysis results show that its correlation with the structural damage index is better than that of the two single parameters before the combination,which can predict the post-earthquake damage level of the structure better.The results of the study can provide an analytical model for earthquake risk monitoring and rapid post-earthquake damage assess⁃ment of construction projects.