削弱梁端的方钢管混凝土柱-钢梁框架结构静力弹塑性分析

Static Elasto-plastic Analysis of Concrete-filled Square Tubular Column to Steel Beam Frame Structure with Reduced Beam Section

提出了适用于SAP2000分析设计软件的等效梁端削弱形式,进而对多层和高层削弱梁端的方钢管混凝土框架结构分别在7度、8度多遇和罕遇地震作用下进行了Push-over分析,并对其抗震性能进行了评估。结果表明:对于多层结构,削弱梁端翼缘对结构整体刚度的影响很小,考虑楼板作用模型的刚度大于未考虑楼板作用模型的刚度,在均布荷载水平加载模式作用下模型的底部剪力大于倒三角荷载水平加载模式作用下相应模型的底部剪力;对于高层结构,楼板作用对结构在弹性阶段整体刚度的影响较小,在均布和倒三角水平荷载作用下,考虑楼板作用模型的最大底部剪力比未考虑楼板作用模型的最大底部剪力分别大7%和4.5%;削弱梁端的方钢管混凝土框架结构具有较好的抗震性能。

The equivalent form of reduced beam section which was fit to SAP2000 analysis design software was presented. Both conventional earthquake and rare earthquake under 7 and 8 seismic intensity Push-over analysis of the structure were made to assess the seismic behavior of concrete-filled square tubular column to steel beams multistory and high-rise frame structure with reduced beam section. The results show that the reduced beam section has little influence on stiffness of the multistory frame structure. The stiffness of model of considering influence of RC floor slab is bigger than that of non-considering influence RC floor slab. The base shearing force of model under uniform lateral load is higher than that of model under inverted triangle lateral load. As for high-rise building, there is little effect of RC floor slab on structure stiffness in elastic stage. The maximal base shearing forces of considering the model of influence of RC floor slab under uniform lateral load and inverted triangle lateral load are bigger than that of non-considering the model of influence of RC floor slab about 7% and 4.5% respectively. The concrete-filled square tubular column to steel beam frame structure with reduced beam section has good seismic behavior.