框架夹心节点抗震性能试验研究

Experimental research on seismic capacity of frame's joint that the core concrete strength is inferior to that of column

高层建筑中,梁柱混凝土强度一般不等,传统框架梁柱节点区一般按柱混凝土浇筑,给施工带来很大不便。节点区按梁板混凝土浇筑(简称夹心节点)成为施工一大需求。对4个位于框架中间层的夹心中节点和夹心边节点进行了低周反复荷载试验研究,从破坏模式、受力性能、刚度退化、延性和耗能能力等方面对试验结果进行了分析,并与传统节点试验成果对比,验证了节点区采用梁混凝土浇筑的可行性,并对此类夹心节点的抗剪承载力验算提出了相应要求。

In the tall building frame structure,the columns＇ concrete strength is usually higher than the beams＇.The traditional frame joint＇s concrete are the same strength as the columns＇.This brings many difficulties to the construction.So the frame joints concreted with beams＇ low grade concrete（named as the frame＇s joint that the core concrete strength is inferior to that of column） is urged intensively by the engineers.Based on test result of four full-scale specimens in the middle floor with the joints represented by lower strength concrete under cyclic load.In this article,the specimens＇ seismic behavior on performance of failure mode,load-carrying capacity,ductility,energy dissipation capacity etc were studied.Through comparison with traditional beam-column joints,engineering applications of these joints is proved to be feasible,and some parameters should be appealed to think about the resisting shear formula of joint in the code.