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为研究传统风格建筑的钢框架结构的破坏形态和抗震性能,以位于抗震设防烈度8度区的一传统风格建筑钢框架结构为原型,按1∶2缩尺比例制作了试验模型,对其进行了低周反复加载试验。试验中观察了钢框架结构的受力过程及破坏形态,得到了结构的荷载-位移滞回曲线、骨架曲线、应变特征、延性、耗能性能、刚度与承载力退化等。试验结果表明:传统风格建筑钢框架结构的斗、栱构件在水平荷载作用下可作为第一道抗震防线,梁端塑性铰发展充分,满足“强柱弱梁、强节点弱构件”的抗震要求;滞回曲线出现捏拢现象,呈Z形变化,表现出剪切滑移特征,与常规钢框架结构有明显的差异;在加载前期刚度退化较为显著;结构破坏时,极限位移角达到1/20,承载力退化系数接近0.9,表现出良好的抗倒塌能力和稳定的承载力。
In order to study the failure mode and seismic performance of the steel frame structure of the traditional style building, a traditional model steel frame structure located in 8 degree seismic fortification intensity was used as a prototype, and a test model was made according to a 1: 2 scale ratio. Low-cycle repeated loading test. During the experiment, the stress process and failure mode of the steel frame structure were observed. The load-displacement hysteresis curve, the skeleton curve, the strain characteristics, the ductility, the energy dissipation performance, the degradation of the stiffness and the bearing capacity of the structure were obtained. The experimental results show that the buckets and stirrup members of the steel frame structure of traditional style can be regarded as the first anti-seismic defense line under horizontal load. The plastic hinge at the beam end develops well and satisfies the requirements of “strong column weak beam and strong node weak component” Seismic buckling phenomenon appears pinched, showing Z-shaped changes, showing shear slip characteristics, and conventional steel frame structure were significantly different; stiffness degradation in the pre-load more significant; structural failure, the limit displacement angle reached 1/20, the bearing capacity degradation coefficient is close to 0.9, showing good anti-collapse ability and stable bearing capacity.