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进行两榀配置核心钢管的钢筋混凝土柱-钢骨混凝土梁组合框架试件在水平低周往复荷载作用下的试验研究,观察试验过程及破坏形态,研究试件的滞回特性、骨架曲线、刚度退化、耗能能力、残余变形等抗震性能,同时对梁柱端纵筋、钢骨翼缘及钢管在不同加载位移下的应变变化规律进行分析,得到框架结构的出铰顺序。研究结果表明:两榀框架滞回曲线饱满,施加预应力后仍具有较好的耗能能力和延性,表现出良好的抗震性能;框架柱底塑性铰区的钢管环向应变在整个加载过程中呈不均匀变化趋势,截面受压区钢管环向受拉,能够对受压区混凝土提供有效约束;钢骨混凝土梁由于施加预应力的作用,可延缓其裂缝的出现;此外,两榀框架试件均呈现“先梁端后柱底”的出铰顺序,能实现梁铰耗能机制,延迟柱底出铰时刻。
Experimental research on the test process and the failure mode of the RC frame-reinforced concrete (SRC) -structural composite beams with core-steel pipe with two ridges were carried out under horizontal low-cycle reciprocating loading. The hysteresis characteristics, the skeleton curves, the stiffness Deformation, energy dissipation, residual deformation and other seismic performance. At the same time, the law of strain change of beam, column flange and steel pipe under different loading displacements was analyzed, and the hinge sequence of the frame structure was obtained. The results show that the hysteresis curve of the bifurcate frame is full, and it still has good energy dissipation capacity and ductility after being prestressed, showing good anti-seismic performance. The circumferential strain of the steel pipe in the plastic hinging zone at the bottom of the frame during the whole loading process The steel pipe in the section under compression is stretched in the circumferential direction, which can provide effective restraint to the concrete in the compression zone. Because of the prestressing effect, the steel-concrete beam can delay the occurrence of cracks. In addition, Pieces are presented “out of the first beam after the column at the end of” the order of the hinge can achieve beam hinge energy dissipation mechanism, delay the moment at the end of column hinge.