【摘要】 工程结构损伤的识别与定位研究以往主要针对梁、框架等结构形式,根据大跨度空间结构杆件和节点繁多等特点,提出用曲率模态和小波混合方法对空间结构的损伤进行识别和定位。以跨度100 m的Schwedler网壳结构损伤前、后的曲率模态作为标识量,分别通过离散和连续小波变换,判断网壳结构有无损伤和损伤位置,统计了小波系数差与结构损伤的图形关系,计算了各种损伤工况下该方法判断损伤的准确程度。结果发现基于曲率模态和小波方法的大跨度网壳结构损伤定位精度很高,充分证明该方法对此类结构损伤定位具有有效性和实用性。更多还原

【Abstract】 The research to identify and locate the damage to the engineering structure mainly aimed at some simple structure forms before,such as beam and framework.In this paper the mixing of the mode curvature and wavelet method to identify and locate the damage to the spatial structure is considered.We take into account the multiplicity of the bars and nodes,and take the destructive and nondestructive mode curvatures of Schwedler reticulated shell with 100 m span as a mark,and calculate the graph relation between coefficients of the wavelets and the damage to the structure by discrete or continuous wavelet transform,and also check the accuracy degree of this method with every damage case.Finally,the conclusion is drawn that the mode curvature and wavelet method to identify and locate the damage to the long span reticulated shell is practical.更多还原