有限测点信息的网架结构风致损伤区域识别方法

Research on Method of Damage Area Identification of Space Truss Structure under Wind Load Based on Limited Measurement Information

在风荷载的作用下,网架结构难免会损伤破坏。由于网架结构节点、杆件众多,在所有节点上布置传感器获得结构的响应信息进行损伤识别是无法实现的。本文提出采用小波变换的方法,捕捉结构节点在风荷载作用下的加速度响应的高频信息,分析某杆件破坏对节点加速度响应的影响,合理划分网架结构子区域,以确定布置传感器的位置和数量,基于有限传感器测量信息识别结构杆件损伤发生的区域,一旦损伤区域确定,在损伤子区域中再进行损伤定位就变得简单易行。最后,以网架结构为数值算例,采用本文提出的方法进行结构损伤区域的识别并考虑了测量噪声的影响,说明该方法的有效性。

It is inevitable that space truss structure will be damaged under wind excited.Due to numerous nodes and bars in the space truss structure,it is unable to identify the structural damage based on measurement response information obtained by arranging sensors on all nodes.Therefore,in this paper,wavelet transform method is used for capturing the high frequency information of structural nodes acceleration response under wind loads.The number of acceleration sensors is determined by rational division of space truss structure based on analysis of influence of bars damage on nodes acceleration response.The damage area in the bars can be identified by lesser sensors measurement information.Then the damaged bars can be easily detected in the damage area of a space truss structure.At last,taking a space truss structure as a numerical example,the damage area identification is carried out by considering measurement noise.The result shows that the proposed method is effective.