双型钢混凝土转换梁柱节点抗震性能试验研究

以广东某高层建筑为工程背景，针对大跨度转换结构，提出了双型钢混凝土转换梁柱节点的构造组合形式，通过对2个转换节点的竖向和水平荷载作用下的低周反复荷载试验，研究了节点的破坏形态、承载能力、刚度、滞回特性、延性、耗能能力及关键位置钢筋和型钢的应变等性能。试验结果表明：转换梁内置双型钢腹板形成的封闭空间对混凝土有约束作用，提高了节点区混凝土的抗剪能力；双型钢混凝土转换梁柱节点的滞回曲线饱满，极限变形能力较强，承载力较高，刚度、延性和耗能能力均较好；被转换柱与双型钢混凝土梁采用“端板螺栓连接”实现了“在被转换柱底部先出现塑性铰”，达到了“强梁强柱，更强节点”和“强转换层，弱框架层”目的。

Experimental study of double-steel encased transfer beam and SRC column connections

Based on a high-rise building in Guangdong Province and its large-span transfer structure, this paper put forward new constructional composite form with the double-steel reinforced concrete transfer (DSRCT) beam-column joint, and two low-cyclic reversed loading tests were conducted on the joints of two DSRCT beams under vertical and horizontal loads.The failure pattern, bending strength, stiffness, hysteretic characteristics, ductility, and energy dissipation capacity of the joints, and strain of reinforcements and shape steel at critical positions were all studied. Experimental results reveal: transfer beam with a built-in double steel web form a closed space constraints for concrete can improve the node region concrete shear capacity; hysteresis curves of double steel reinforced concrete transfer beam of are full; the deformation capacity, bearing capacity, stiffness, ductility and energy dissipation capacity are also improved; the end plate bolted connection for the converted column and double steel reinforced concrete beam can result in the development of plastic hinge at bottom of the converted column first, ensuring the mechanisms of ‘strong beam and column and stronger joints’ and ‘strong transfer structure’ in the seismic design.