加强型钢筋混凝土夹芯角节点抗剪承载力分析

Shear capacity analysis of strengthed RC angle joint with fillings

高层建筑结构中柱的混凝土强度等级往往高于梁板的混凝土强度。采用夹芯节点施工较为方便,然而当梁柱混凝土等级级差过大时,节点承载力将不能满足设计要求。针对这一问题,通过数值模拟分析对框架角节点区进行了应力分布和抗剪承载力特征分析。研究表明:采用箍筋加强和梁端竖向加腋的加强措施,既满足了强度要求,又减小了施工难度。

The concrete strength of the column is usually higher than that of the beam-plate in high rise buildings. And it is much easier to construct the joint with the same grade of beam. However, when the difference between the strength of the column and beam concrete is too large, the joint cannot meet the strength requirement. Numerical analysis was used to do some embedded research of the frame-joint when the concrete strengths were different between the column and the beam. In addition, there were internal and external methods to improve the shear bearing capacity of the joints with fillings. The one is to increase stirrups of the joint core, and another one is to adopt vertical haunch at the beam-ends. It not only meets the requirements of strength, but also reduces the difficulty of construction.