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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。
Under the action of wind load, the grid structure will inevitably damage and destroy. Due to the large number of nodes and poles in the grid structure, it is impossible to identify the damage response by arranging the sensors on all the nodes to obtain the structure response information. In this paper, the wavelet transform method is used to capture the high frequency information of the acceleration responses of the structural nodes under the wind loads. The influence of the failure of a bar on the acceleration responses of the nodes is analyzed. The sub-regions of the grid structure are reasonably divided to determine the position of the sensor Based on the finite sensor measurement information, it is possible to identify the area where structural rod damage occurs. Once the damaged area is identified, it is easy to locate the damaged area again in the damaged sub-area. Finally, taking the grid structure as a numerical example, the method proposed in this paper is used to identify the structural damage area and to consider the influence of measurement noise, which shows the effectiveness of the method.