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为揭示CRB550级箍筋混凝土梁的抗震性能,按等强度准则设计了18个不同纵筋配筋率、箍筋强度等级、箍筋直径的钢筋混凝土梁构件,并对其进行低周反复作用下的拟静力试验,分组对比分析骨架曲线、延性和耗能性能.结果表明:a.在箍筋强度相等的前提下,较小直径CRB550配箍的混凝土梁试件与满足规范最小直径的HPB235配箍的混凝土梁试件相比,在纵向筋配筋率中等和偏大情况下延性要好,在纵向配筋率偏小的情况下延性稍弱但相差不大,两者承载力相差不大;b.在能量耗散方面,各对比组中按等强原则采用较小直径CRB550配箍的混凝土梁试件与对应的HPB235,HPB335配箍的混凝土梁试件的等效黏滞阻尼系数基本相同,归一化总滞回耗能也相差无几,都具有很好的耗能能力.
In order to reveal the seismic performance of CRB550-class stirrup reinforced concrete beams, 18 reinforced concrete members with different longitudinal reinforcement ratio, stirrup strength grade and stirrup diameter were designed according to the equal strength criterion and subjected to low cycle repetition The results show that: a. Under the condition of equal strength of stirrup, the concrete beam specimens with smaller diameter CRB550 hoop and the HPB235 with the smallest diameter Compared with the concrete beams with hoop, the ductility is better when the longitudinal reinforcement ratio is medium and larger, and the ductility is slightly weaker but the difference is not large when the longitudinal reinforcement ratio is small ; b. In terms of energy dissipation, the equivalent viscous damping coefficient of the concrete beam specimens with the smaller diameter CRB550 with the hoop principle and the corresponding HPB235, HPB335 with the hoop in each comparison group The same, normalized total hysteresis energy consumption is also almost the same, have a good energy consumption.