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为研究钢梁与混凝土楼板的组合作用对钢-混凝土组合框架体系的刚度、承载力及耗能能力的影响,并考察组合框架结构在大震作用下进入弹塑性阶段的受力性能,进行了2榀足尺方钢管混凝土组合框架的低周反复荷载试验。2榀组合框架分别为组合梁-钢管混凝土框架及纯钢梁-钢管混凝土框架。试验中结构的最大层间位移角达到1/21。试验结果表明:组合框架结构具有稳定的滞回性能及良好的延性;钢梁与混凝土楼板的组合作用能显著提高结构的刚度、强度及耗能能力,并且能有效保证钢梁上翼缘的局部稳定性及钢梁的整体稳定性;楼板组合作用将使钢梁下翼缘应变显著增大,导致楼盖梁转动能力的减小;两个试件的破坏均是由梁端失效引起,说明试验中采用的梁翼缘贯通式节点能够满足强柱弱梁、强节点弱构件的抗震设计要求。
In order to study the effect of the combination of steel beam and concrete slab on the stiffness, bearing capacity and energy dissipation capacity of the steel-concrete composite frame system, the mechanical properties of the composite frame structure subjected to the elasto-plastic phase under large earthquake are investigated. LOW CYCLIC REVERSE LOAD TEST OF A 2 榀 SQUARE CONCRETE FILLED STEEL TUBULAR FRAME. 2 榀 composite frame are composite beam - concrete filled steel tube frame and pure steel - concrete-filled steel frame. The maximum interlaminar drift angle of the structure reached 1/21. The experimental results show that the combined frame structure has stable hysteretic behavior and good ductility. The combined effect of steel beam and concrete floor can significantly improve the stiffness, strength and energy dissipation of the structure, and can effectively ensure the local stability of the flange on the steel beam And the overall stability of the steel beam; the combination of floor slabs will significantly increase the strain of the lower flange of the steel beam, resulting in reduced rotation capacity of the floor beam; failure of the two specimens are caused by failure of the beam ends, indicating that during the test The adopted flange-through nodes can meet the seismic design requirements of weak columns with weak columns and strong nodes.