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随着大跨度网壳结构近些年在重大工程中的大量应用,该结构在强震作用下的失效机理问题也逐渐突出,为空间结构学者所关注。在总结了近些年大跨度网壳结构强震失效机理领域的研究进展基础之上,介绍了适用于网壳结构强震失效机理分析的基于荷载域全程响应的分析方法,以及在该方法中引入材料损伤累积的研究过程;定义了网壳结构在强震作用下的两类失效模式,即由几何非线性引起的动力失稳和由过度塑性损伤导致的动力强度破坏;论述了基于模糊数学中模糊综合判断理论的判别网壳结构强震失效模式的方法;在此基础上,对网壳结构动力损伤模型的建立也进行了阐述,并对网壳结构在强震下失效极限的确定方法进行了总结。
With the extensive application of long-span reticulated shell structures in major projects in recent years, the failure mechanism of the structure under the action of strong earthquakes has also become increasingly prominent, attracting the attention of space structure scholars. Based on the research progress in the field of failure mechanisms of large-span reticulated-shell structures in recent years, an analysis method based on the whole response of load-bearing region is proposed, which is applicable to the failure mechanism analysis of strong earthquakes with reticulated shell structure. In this method The research process of material damage accumulation is introduced. Two types of failure modes of reticulated shell under strong earthquake are defined, that is, dynamic instability caused by geometric nonlinearity and dynamic strength damage caused by excessive plasticity damage. In this paper, the establishment of dynamic damage model of reticulated shell structure is also described, and the method to determine the failure limit of reticulated shell structure under strong earthquakes Concluded.