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通过敲击试验及坠物试验研究单层网壳结构在缺陷影响下的非线性稳定性,设计一种复杂结构曲面模型,在其靠边缘位置构造一处人造缺陷,通过传感器进行各种信号收集,对结构进行敲击及坠物两种操作,分别通过传感器对其频率及模态进行识别,结合破坏形式判断结构其他杆件与缺陷在受载后的破坏发展情况及各自产生破坏的原因。通过有限元分析与试验比较,荷载达到极限后杆件发生失稳破坏,结构性能直接被破坏,而距缺陷较远的部分则发生弯曲变形,部分结构性能损失,并且由缺陷向外呈现破坏逐渐减轻情况。
The impact of imperfection on the nonlinear stability of single-layer reticulated shell structure was studied by the percussive test and the falling object test. A complex structure and surface model was designed to construct a man-made defect by the edge. Various signals were collected by sensors , The structure of the hammer and falling objects are two operations, respectively, through the sensor to identify its frequency and modalities, combined with the form of damage to determine the structure of other components and defects under load after the development of the damage and their causes of damage. Through the comparison between finite element analysis and experiment, after the load reaches the limit, the rod is destabilized and destroyed, the structural performance is directly destroyed, while the part far away from the defect is bent and deformed, the structural performance is lost partially, and the defect appears outward from the defect Reduce the situation.