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为了揭示强震下空腹球面网壳结构的动力失效机理,对一个跨度为100m的K6型空腹球面网壳结构进行了不同地震加速度下的全过程动力时程分析.依据已有的B-R动力失稳判定准则和评定网壳结构动力强度破坏行为的方法,研究该结构在强震作用下结构最大位移、进入塑性杆件比例、最大单元相对应变等特征响应指标的变化规律.分析结果表明:K6型空腹球面网壳在破坏之前已经历了较大的塑性发展过程,结构在塑性发展和位形变化的交互作用下产生破坏,其最终破坏形式趋于动力强度破坏.
In order to reveal the dynamic failure mechanism of the reticular shell structure under strong earthquakes, a dynamic time-history analysis of K6-type fast reticulated dome with a span of 100m under different earthquake accelerations was carried out.According to the existing BR dynamic instability The criterion of judgment and the method of assessing the dynamic strength failure of reticulated-shell structures, the change laws of the characteristic response indexes such as the maximum displacement of structures, the proportion of plastic rods entering and the relative maximum strain of the structure under the action of strong earthquakes are studied.The results show that K6 The fast reticulated reticular shell has undergone a large plasticity development process before its destruction. The structure is destroyed under the interaction of plasticity and deformation, and the final damage form tends to destroy the dynamic strength.