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通过1榀梁柱均含型钢的预应力型钢混凝土框架竖向低周反复荷载试验,研究预应力型钢混凝土(PSRC)框架梁在竖向地震作用下的破坏形态、滞回特征、延性性能及耗能能力.结果表明:PSRC框架梁发生“三铰”的梁铰破坏机制,滞回曲线饱满,具有良好的延性和抗震耗能能力.利用ABAQUS软件对试验试件进行了有限元模拟,计算结果与试验结果吻合较好;在此基础上对该结构进行参数分析,研究混凝土强度、含钢率、预应力强度比及换算配筋率对P-Δ骨架曲线和延性性能的影响.结果表明:增大混凝土强度、预应力强度比、换算配筋率,框架梁承载力增加,但延性降低;随着含钢率的增加,框架梁承载力及延性均增大.通过位移延性系数分析,本文建议含钢率范围为4%~8%,预应力强度比λ不宜大于0.6,换算配筋率不宜大于3.6%.提出竖向地震作用下位移延性系数的计算方法,可供工程设计时参考.
Through vertical low-cycle cyclic loading test of prestressed steel reinforced concrete (CFST) frame with 1 × 10% beam and steel beam, the damage morphology, hysteretic characteristics, ductility and energy dissipation capacity of prestressed steel reinforced concrete (PSRC) The results show that the PSRC frame beam has the mechanism of “three hinges” beam hinge failure, the hysteresis curve is full, and has good ductility and seismic energy dissipation capability. The ABAQUS software is used to simulate the test specimens and the results And the experimental results are in good agreement with each other.The parameters of the structure are analyzed on this basis and the influence of concrete strength, steel content, prestressing strength ratio and converted steel ratio on the P-Δ skeleton curve and ductility is studied.The results show that: Increasing the strength of concrete, the ratio of prestressing strength and the ratio of reinforcement to reinforcement, the bearing capacity of frame beam increases, but the ductility decreases. With the increase of steel content, the bearing capacity and ductility of frame beam increase.According to the displacement ductility coefficient, Proposed steel content range of 4% ~ 8%, prestressed strength ratio λ should not be greater than 0.6, the conversion rate of reinforcement should not be greater than 3.6%. Proposed displacement seismic vertical displacement ductility coefficient calculation method for engineering design Reference.