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系统地研究了双层凯威特型球面网壳在三维地震动激励下的失效机理及破坏过程。将4种矢跨比的网壳作为分析对象,以其变形能力、屈服杆件数、应变能和应变等作为考察网壳结构动力特性的指标,选取了Taft,Kobe和El Centro这3条地震记录,深入研究了网壳结构在地震动作用下的破坏过程,给出了各矢跨比网壳杆件失效的先后次序,研究了4种网壳结构失效机理的异同之处。计算表明:尽管临界峰值加速度不同,但4个球面网壳的动力响应在一些方面表现出了共性,如网壳均经历了较深的塑性发展与损伤累积,最后均发生了强度破坏;网壳的失效机理与破坏过程却截然不同;进行抗震计算时,应根据网壳的动力特性与地震波的频谱特性合理地选择所需输入的地震波。研究结论可为双层球面网壳的设计提供借鉴与参考。
The failure mechanism and failure process of double-layer Kaiweite type spherical reticulated shell excited by three-dimensional ground motions are systematically studied. Based on the deformation capacity, the number of yield bars, the strain energy and the strain, four kinds of latticed shells with crosswise ratio were selected as the indexes to study the dynamic characteristics of the reticulated shell structure. Three seismic records, Taft, Kobe and El Centro, were selected , The destructive process of the reticulated shell structure under the action of the earthquake was studied in depth. The order of failure of each shell of the reticulated shell shell was given. The similarities and differences between the failure mechanisms of the four reticulated shell structures were studied. The calculated results show that the dynamic responses of the four spherical reticular shells show some common features in some aspects, such as the deep reticulation of the reticulated shells and the accumulation of damage, with the ultimate failure of strength despite the different critical peak accelerations. The failure mechanism and the destruction process are quite different. When seismic calculation is carried out, the seismic waves to be input should be reasonably selected according to the dynamic characteristics of the reticulated shell and the spectral characteristics of the seismic waves. The research conclusion can provide reference and reference for the design of double-layer spherical reticulated shells.