钢管混凝土柱-双面组合作用梁框架节点抗震性能试验研究

EXPERIMENTAL STUDY ON SEISMIC BEHAVIOR OF FRAME JOINTS WITH CONCRETE-FILLED STEEL TUBULAR COLUMN AND DOUBLE-SIDED COMPOSITE BEAM

为了研究钢-混凝土双面组合作用梁框架节点的抗震性能,设计了3个钢-混凝土双面组合作用梁十字形框架节点和1个普通钢-混凝土单面组合作用梁十字形框架节点,并对其进行低周往复加载试验,对比分析其破坏模式、极限承载力、初始刚度、耗能能力、延性、刚度退化等抗震性能指标;通过改变下部混凝土板厚度和传力方式,研究下部混凝土板不同厚度和不同传力方式对双面组合作用梁力学性能的影响。结果表明:与普通钢-混凝土单面组合作用梁框架节点相比,钢-混凝土双面组合作用梁十字形框架节点具有更高的承载力和刚度,适用于荷载较大的结构,但在延性、刚度退化和耗能能力等方面无明显优势;下部混凝土板采用集中传力和均匀传力的方式对双面组合作用梁抗震性能的影响无明显区别;下部混凝土板采用预制法制作和螺栓连接更加方便、可靠。

In order to study the seismic performance of frame joints with concrete-filled steel tubular column and double-sided composite beam,three cross-shaped frame joints of a double composite steel-concrete beam and one cross-shaped frame joint of a normal single composite steel-concrete beam were designed,and low-cycle reciprocating loading tests were carried out to compare and analyze their failure modes and ultimate bearing capacity,initial stiffness,energy dissipation capacity,ductility,stiffness degradation,and other seismic performance indicators.By changing the thickness and load transfer mode of the bottom concrete slab,the influence of different thickness and different load transfer mode of the bottom concrete slab on the mechanical properties of the double-sided composite beam is studied.The results show that:compared with normal single composite steel-concrete beam-frame joints,double composite steel-concrete beam-frame joints have higher bearing capacity and stiffness,and are suitable for structures with larger loads,but have no obvious advantages in ductility,stiffness degradation and energy dissipation capacity.There is no obvious difference in the effect of concentrated and uniform load transfer on the seismic performance of double composite beams,and prefabricated concrete slabs and bolted connections are more convenient and reliable.