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通过一榀高强螺栓端板连接的2层1跨半4∶7比例组合梁-方钢管混凝土模型框架的拟动力试验、拟静力试验和静力推覆试验,运用子结构方法,模拟了一榀10层3跨的平面框架,研究了钢管混凝土框架结构的破坏形态、位移响应、滞回特性和耗能等抗震性能。拟动力试验中,多遇烈度地震时,框架刚度降低很小;基本设计烈度地震时,框架刚度降低约13%;罕遇烈度地震时,框架刚度降低20%,框架层间位移角小于2.0%。拟静力试验中,最大层间位移角超过1.6%,部分构件出现初始局部屈曲,框架整体未出现强度退化。在静力推覆试验中,即使层间位移角超过6.0%,框架承载力仍未发生下降。高强螺栓端板连接节点能够满足抗震设计要求,在规范限定的按弹塑性设计的层间位移角限值范围内,经过合理设计的螺栓端板连接可视为刚性连接。试验结果验证采用螺栓连接的钢梁-方钢管混凝土框架具有良好的抗震性能,可在抗震设防区结构中推广使用。
Through the pseudo-dynamic test, quasi-static test and static pushover test of a two-story, one-half and one-half 4: 7 ratio composite beam-square concrete filled steel tubular frame connected by a high-strength bolt end plate,榀 10-story and 3-span plane frame. The failure mode, displacement response, hysteretic behavior and energy dissipation of CFST frame structure are studied. In the quasi-dynamic test, the stiffness of the frame decreases little when the earthquake is intense; the stiffness of the basic design is reduced by about 13% in the case of an earthquake; the stiffness of the frame is reduced by 20% in the rare earthquake and the displacement angle of the frame is less than 2.0% . In quasi-static tests, the maximum layer displacement angle is over 1.6%, initial partial buckling occurs in some members and no strength degradation occurs in the whole frame. In the static nappe test, the bearing capacity of the frame has not decreased even though the displacement angle between layers exceeds 6.0%. High-strength bolt end plate connection nodes can meet the seismic design requirements, within the limits of the standard definition of elastic-plastic design of the layer within the limits of displacement, a properly designed bolt end plate connection can be regarded as rigid connection. Experimental results verify the use of bolted steel beam - square steel tube concrete frame has good seismic performance, can be used in the structure of the earthquake fortification zone.