矩形钢管混凝土柱与梁板式楼盖连接装置试验研究

Experimental study on connection device of rectangular concrete-filled steel tubular column and beam-slab floor

针对北京CBD核心区Z13地块超高层建筑(中国人寿)主体结构外框架柱采用的矩形钢管混凝土柱与混凝土梁及楼板连接问题,提出了矩形钢管混凝土柱与梁板式楼盖连接装置。为研究该连接装置的实际受力性能,进行了两组矩形钢管混凝土柱与梁板式楼盖连接装置试验。在低周往复加载作用下,研究试件的滞回曲线、骨架曲线、破坏形态、耗能能力等力学性能。研究结果和工程实践表明:考虑楼板的连接装置试件相较于不考虑楼板的试件,承载能力及整体刚度更高,延性性能略有降低。考虑楼板作用时,型钢牛腿承担剪力更小,设计时可按30%梁端荷载设计型钢牛腿截面,达到节约钢材的目标。

In view of the connection problems of the rectangular concrete-filled steel tubular columns,the concrete beam and slab used in the outer frames of the main structure of the super high-rise building(China Life)in the Z13 project of CBD core area in Beijing,a connection device of rectangular concrete-filled steel tubular column and beam-slab floor was proposed.In order to study the actual mechanical performance of the connection device,two groups of the connection devices of rectangular concrete-filled steel tubular column and beam-slab floor were tested.Under low-cycle reciprocating loading,the mechanical properties of the specimens such as hysteresis curve,skeleton curve,failure morphology,and energy dissipation capacity,were analyzed.The research results and engineering practice show that the test specimen of the connection device considering floor slab has higher bearing capacity and overall rigidity as well as lower ductility than that without considering floor slab.As considering the effect of the floor slab,the profiled steel corbel bears less shear force and the section of the profiled steel corbel can be designed according to 30%of the beam end load during the design to achieve the goal of saving steel.