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采用三维实体退化虚拟层合单元非线性有限元分析法,考虑梁板柱空间协同效应,经对一单层2×2跨RC空间板柱结构中柱失效倒塌试验模拟分析并与试验结果对比之后,分别对三种不同抗震设防RC空间框架结构模型进行连续性倒塌非线性仿真分析,得出随抗震设防烈度提高,框架结构抗连续性倒塌的空间刚度增大,倒塌模式从“缓变型”向“陡变型”转变;抗震设防烈度越高,结构竖向抗连续性倒塌能力越强;楼板膜效应延缓了梁悬链线阶段的出现,而框架梁对楼板膜应力机制和悬链面机制起到加强作用,楼板与框架梁协同工作在悬链线(面)阶段整体提高竖向抗连续性倒塌能力等研究结论。
The nonlinear finite element analysis method of three-dimensional solid degenerated virtual laminated element was adopted. Considering the space synergy effect of beam-column and column, after a failure analysis of the failure of the center column in a 2 × 2 RC space plate column structure with a single layer and comparison with the experimental results, The non-linear continuous collapse analysis of three RC frame structures with different seismic fortification results shows that as the seismic fortification intensity increases and the space stiffness of the frame structure against continuous collapse increases, the collapse pattern changes from “Steep change” change; seismic fortification intensity is higher, the stronger the vertical vertical anti-collapse; the slab membrane effect delays the emergence of beam catenary phase, while the frame beam on the floor membrane stress mechanism and catenary Mechanism to play a role in strengthening the floor and frame beams work together in the catenary (surface) stage to enhance the vertical anti-continuous collapse of the ability to conclude.