综合曲率和协整识别环境温度影响下的结构损伤

Identification of structural damage under the influence of ambient temperature by comprehensive curvature and cointegration

结构损伤引起的损伤特征参数的变化往往被变化的环境温度引起的损伤特征参数的变化所掩盖,从而导致基于静载荷的损伤识别方法失效。论文提出了综合曲率模态和协整的方法,在变化的环境温度影响下进行简支梁结构损伤识别研究。环境温度变化下,首先,对无损结构采集挠度数据并计算成曲率,选择曲率为协整变量;其次,对不同节点的协整变量进行协整;然后,将协整所得的协整残差作为损伤指标;最后,利用X-bar控制图建立置信区间用于评定损伤状态下的协整残差,识别结构损伤。混凝土与工字钢简支梁数值模拟结果表明该方法能够有效地识别环境温度影响下的结构损伤。

The change of damage characteristic parameters caused by structural damage is often masked by the change of damage characteristic parameters caused by the changing ambient temperature,which leads to the failure of the damage identification based on static load.In this paper,a comprehensive curvature mode and co-integration method is proposed to study the damage identification of simply supported beam structures under the influence of the changing ambient temperature.When the ambient temperature changes,the deflection data of the non-destructive structure is firstly collected and calculated as the curvature,the curvature is selected as the cointegration variable,and then the cointegration variables of different nodes are cointegrated,and then the cointegration residual obtained by the cointegration is used as the damage index;finally,the X-bar control chart is used to establish confidence intervals for evaluating the cointegration residuals in the damaged state and identifying structural damage.The numerical simulation results of concrete and I-beam simply supported beams show that the method can effectively identify the structural damage under the influence of ambient temperature.