钢框架-钢筋混凝土核心筒结构的协同工作性能分析

ANALYSIS ON COOPERATIVE WORKING PERFORMANCE OF STEEL FRAME-REINFORCED CONCRETE CORE-WALL STRUCTURE

为了提高钢框架-钢筋混凝土核心筒结构在地震作用下的协同工作性能及减小结构在竖向荷载作用下的变形差异,可采取以下措施:在钢框架上加设大型斜撑;在钢框架和核心筒之间增设伸臂桁架以及同时增设大型斜撑和伸臂桁架。利用有限元软件ETABS,对比分析了这几种结构形式的协同工作性能。分析结果表明:在钢框架上加设大型斜撑可明显提高结构的刚度,框架的剪力分配率更易满足规范要求,框架柱的材料利用效率更高;增设伸臂桁架对整体结构的刚度影响不大,但可有效减小钢框架和核心筒之间的竖向变形差;同时增设大型斜撑和伸臂桁架可显著提高钢框架-钢筋混凝土核心筒结构的协同工作性能。

Several methods can be used to develop the cooperative working performance of steel frame-reinforced concrete core-wall structure, such as setting mega braces on steel frame, connecting steel frame and concrete core-wall by cantilever trusses and setting mega braces along with cantilever trusses. The efficieneies of these methods were analyzed by using the software ETABS. The results indicate that the stiffness of structure can be effectively developed by setting braces and the shear distribution rate is more reasonable. The vertical deformation difference between steel frame and concrete core-wall can be reduced by setting cantilever trusses. The cooperative working＂ performance of steel frame-reinforced concrete core-wall structure with mega braces and cantilever trusses is the best.