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为研究低周反复荷载作用下钢管再生混凝土框架的强度与刚度,进行了一榀圆钢管和一榀方钢管的再生混凝土柱-钢筋再生混凝土梁框架试件的拟静力试验,实测试件的破坏机制、滞回曲线、强度衰减和刚度退化等,探讨单层单跨钢管再生混凝土框架的层间受剪承载力和刚度设计方法。研究结果表明:试件满足了“强柱弱梁、强剪弱弯”的抗震设计要求,滞回曲线基本对称,同级循环位移下试件的强度衰减和刚度退化大致经历一个由多到少再到多的过程。建议采用柱端弹性弯矩法或柱顶塑性铰法或柱底塑性铰法,进行单层单跨钢管再生混凝土框架的层间受剪承载力的设计计算,本文采用的方法可以用于钢管再生混凝土框架初始弹性层间刚度的估算。
In order to study the strength and stiffness of the recycled concrete frame under low cyclic loading, the pseudo-static tests of a recycled concrete column-reinforced concrete beam-reinforced concrete beam with a half-round pipe and a square steel pipe were carried out. The failure mechanism, the hysteresis curve, the strength attenuation and the stiffness degradation, the design method of shear capacity and stiffness of single-story single-span SRCF are discussed. The results show that the test specimen meets the seismic design requirements of “strong column and weak beam, strong shear weak bend”, and the hysteresis curve is basically symmetrical. The strength attenuation and stiffness degradation of the specimen under the same level of cyclic displacement generally undergo a multi- To the next few more processes. It is recommended to design and calculate the interlaminar shear capacity of single-span single-span steel tube recycled concrete frame by using column-end elastic moment method or plastic hinge method at the top of the column or plastic hinge method at the bottom of the column. The method adopted in this paper can be used for steel tube regeneration Estimation of initial elastic interlayer stiffness of concrete frame.