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为了探讨L形钢管混凝土柱-钢梁框架的抗震性能,进行了4个1/2.5缩尺比例两层单跨L形钢管混凝土柱-钢梁空间框架的拟静力试验研究,主要考察了柱轴压比(n=0.4,0.6)、加载方向(β=0,°45°)对试件抗震性能的影响,对结构的破坏形态、破坏机制、滞回曲线、结构塑性铰出现的位置及次序、位移延性和耗能能力等性能进行了研究。试验结果表明:结构的破坏形态基本相同,梁端先屈曲,形成塑性铰,然后柱脚核心混凝土开裂压碎,钢管屈曲,形成塑性铰,节点核心区没有出现破坏现象,满足“强柱弱梁、强节点”的抗震设计要求;结构的滞回曲线呈饱满的梭形,强度和刚度退化不明显,变形能力和耗能能力较强;结构的延性较好,正向和反向的位移延性系数均大于4.0;轴压比对结构的抗震性能影响较大,随着轴压比的增大,框架的位移延性和耗能能力降低。
In order to investigate the seismic behavior of L -shaped CFST-steel beam frame, four pseudo-static tests of four 1 / 2.5-scale single-span L-shaped CFST-steel beam space frames were carried out. The influence of axial compression ratio (n = 0.4, 0.6), loading direction (β = 0, ° 45 °) on the seismic performance of the specimens, the damage morphology, failure mechanism, hysteresis curve, Order, displacement ductility and energy dissipation capabilities were studied. The experimental results show that the failure modes of the structure are basically the same, the beam ends buckle firstly to form the plastic hinge, then the core concrete of the column foot cracks and crushes, the steel pipe buckles to form the plastic hinge, the core area of the node does not appear the damage phenomenon, Strong node "seismic design requirements; structure hysteresis curve was full spindle, strength and stiffness degradation is not obvious, deformation and energy dissipation ability is strong; ductility of the structure is better, the positive and negative displacement ductility The coefficient is greater than 4.0; the axial compression ratio has a greater impact on the seismic performance of the structure, with the increase of axial compression ratio, the displacement ductility and energy dissipation capacity of the frame decrease.