School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan, Hubei, China.
Beijing Glory PKPM Technology Co., Ltd., Beijing, China.
PLoS One. 2022 Jul 18;17(7):e0270978. doi: 10.1371/journal.pone.0270978. eCollection 2022.
Analyzing the seismic performance and flexural capacity of beam-column joints is crucial in structural design phase. The purpose of this paper is to investigate the seismic performance and flexural capacity of precast prestressed efficiently fabricated frame (PPEFF) joints. Reverse cyclic load tests and flexural capacity analysis are conducted. The damage modes, hysteresis curves, skeleton curves, stiffness degradation, ductility, and energy dissipation capacity of five PPEFF joint specimens with different reinforcement rates of the energy-dissipating bars and shear reinforcement are obtained. The results show that the damage pattern of the specimen is ideal, i.e., the plastic hinge region at the end of the beam is severely damaged, whereas the remainder of the beam is slightly damaged. Increasing the reinforcement rate of the energy-consuming steel bars enhances the load capacity, energy dissipation capacity, and initial stiffness of the joint but reduces the ductility performance. The maximum change in ductility was 5.31 for the reinforcement rate of energy-consuming steel bars ranging from 0.38% to 0.59%. In addition, the flexural capacity of the PPEFF joint is evaluated, considering the influence of the shear steel on the yielding and ultimate states. An equation of the flexural capacity is derived. A good agreement is observed between the experimental and calculation results, verifying the correctness of the proposed flexural capacity equation.
分析梁柱节点的抗震性能和抗弯能力是结构设计阶段的关键。本文旨在研究预制预应力高效制作框架（PPEFF）节点的抗震性能和抗弯能力。进行了反向循环荷载试验和抗弯能力分析。获得了五个具有不同消能钢筋和剪切钢筋配筋率的 PPEFF 节点试件的破坏模式、滞回曲线、骨架曲线、刚度退化、延性和耗能能力。结果表明，试件的破坏模式理想，即梁端的塑性铰区域严重损坏，而梁的其余部分轻微损坏。增加消能钢筋的配筋率可以提高节点的承载能力、耗能能力和初始刚度，但会降低延性性能。耗能钢筋配筋率从 0.38%增加到 0.59%时，延性的最大变化为 5.31。此外，考虑剪切钢筋对屈服和极限状态的影响，对 PPEFF 节点的抗弯能力进行了评估，得出了抗弯能力的计算公式。试验结果和计算结果吻合较好，验证了所提出的抗弯能力计算公式的正确性。
