竖向荷载下足尺半刚性连接组合框架试验研究

为研究半刚性连接组合框架在静载作用下的力学性能,进行了竖向荷载下两榀足尺的两层两跨半刚性连接组合框架试验。组合框架由H型钢柱和压型钢板混凝土组合梁组成,钢节点由焊接到钢梁端部的平端板通过螺栓与钢柱翼缘连接。为了解半刚性连接组合框架的结构性能和破坏特征,考察不同荷载水平作用下半刚性连接和楼板的组合效应对钢框架结构整体性能的影响,重点分析框架整体性能、节点性能和梁性能。试验表明:平端板型组合节点为半刚性连接、部分强度节点,具有较高的强度和刚度,其极限转角可满足不小于30mrad的延性设计要求;半刚性连接和楼板的组合效应对钢框架的强度、刚度和延性有较大影响,设计时应加以考虑。试验结果可为今后半刚性连接组合框架理论研究和工程实际应用提供参考。

An experimental study of full-scale semi-rigid composite frames under vertical loading

Results are presented for a pair of tests of full-scale two-storey-two-bay semi-rigid composite frames.The composite frame is composed of H-shape steel columns and composite beams with steel plates.The steelwork connection consists of a flush end plate welded to the end of the beam and bolted to the column flange.To investigate the influences of semi-rigid joints and slabs on the performance of steel frames,overall response of the frame,connection behavior and beam behavior are analyzed.It is found that the composite endplate connection,which acts as a semi-rigid and partial-strength node,has high strength and rigidity;it satisfies the ductility design requirement that rotation capacity can be no less than 30mrad.Therefore,the effects of semi-rigid joints and slabs on the strength,rigidity and ductility of steel frames should be properly taken into consideration in design.