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Cyclic loading tests and shear strength of composite joints with steel- reinforced recycled concrete columns and steel beams

机译：钢骨再生混凝土柱和钢梁组合节点的循环荷载试验和抗剪强度

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摘要

Cyclic loading tests were conducted for eight composite joints (five interior joints and three exterior joints) with steel-reinforced recycled concrete (SRRC) columns and steel beams under cyclic loading. The axial compression ratio and recycled coarse aggregate (RCA) replacement percentage were considered as the main design parameters for the above composite joints. The failure process, failure modes, hysteresis loops, skeleton curves, stiffness degradation, storey drift ratio, bearing capacity, ductility and energy dissipation capacity of the joints were presented and analysed in detail. The influence of the design parameters on the mechanical performance of the composite joints under cyclic loading was also investigated. Results showed that the cracking loads of the joints increased with the increase of axial compression ratio. Typical shear failure was the failure mode. The spindle-shaped hysteresis loops of the joints, the ductility coefficients, the elastic-plastic storey drift ratios and the equivalent viscous damping coefficients indicated a relatively good seismic performance. The bearing capacity and stiffness of the joints decreased gradually, while the ductility and energy dissipation capacity of the joints decreased slightly with an increase in the RCA replacement percentage. Additionally, the stiffness degradation of the composite joints accelerated and the energy dissipation capacity and ductility reduced evidently with an increase in the axial compression ratio. Finally, a comparative analysis of each shear strength formula was conducted. The result showed that the formulas of ASCE, AU and JGJ138-2001 could predict the shear strength of the joints accurately. This validation indicated that the existing methods are applicable to this group of composite joints.
机译：循环荷载试验是对八个复合接头（五个内部接头和三个外部接头）与钢筋混凝土（SRRC）柱和钢梁在循环荷载下进行的。轴向压缩比和再生粗骨料（RCA）替代百分比被视为上述复合节点的主要设计参数。给出并详细分析了接头的失效过程，失效模式，磁滞回线，骨架曲线，刚度下降，储层漂移比，承载力，延性和能量耗散能力。还研究了设计参数对循环荷载作用下复合材料接头力学性能的影响。结果表明，随着轴向压缩比的增加，接头的开裂载荷增加。典型的剪切破坏是破坏模式。接头的纺锤形磁滞回线，延性系数，弹塑性层间位移比和等效粘性阻尼系数表明了相对较好的抗震性能。关节的承载力和刚度逐渐降低，而关节的延展性和能量消散能力则随着RCA置换百分比的增加而略有下降。此外，随着轴向压缩比的增加，复合材料接头的刚度退化加速，能量消耗能力和延展性明显降低。最后，对每个抗剪强度公式进行了比较分析。结果表明，ASCE，AU和JGJ138-2001的公式可以准确预测接头的剪切强度。该验证表明，现有方法适用于这组复合节点。

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