ABSTRACT

Three RC beam-column subassemblages, in which the concrete columns were reinforced by multiple composite central reinforcements and multiple-steel stirrups, were tested under reversed cyclic loading. The test results show that the increase in axial compression ratio (increased from 0.2 to 0.35) had little effect on the energy dissipation, but increased the peak load by 60.5% and decreased the ultimate deformation by 34.4%. The increase in shear span ratio of the column (increased from 2.6 to 3.7) improved the energy dissipation and deformation capacity, but decreased the peak load by 17.6%. In addition, the stress–strain relationships of the concrete confined by multiple stirrups were represented by functions with different levels of confinement, and an equivalent coefficient was proposed to simplify the computation. Finally, the analytical methods to predict the yielding response and deformation constitution of the specimen were developed.

摘要

三个 RC 梁柱组件，其中混凝土柱由多个复合中心钢筋和多个钢筋箍筋加固，在反向循环荷载下进行了测试。试验结果表明，轴压比的增加（从0.2增加到0.35）对耗能影响不大，但峰值载荷增加了60.5%，极限变形减少了34.4%。柱的剪跨比增加（从 2.6 增加到 3.7）提高了能量耗散和变形能力，但峰值荷载降低了 17.6%。此外，将多箍筋约束混凝土的应力-应变关系用不同约束程度的函数表示，并提出等效系数以简化计算。最后，