Reinforcement congestion causes problems during construction, including improper concrete pouring and concrete vibration. In this study, the replacement of normal concrete by high-performance fibre-reinforced cementitious composites (HPFRCC) has been investigated in order to reduce the amount of transverse reinforcement and prevent reinforcement congestion in beam–column joints. Uniaxial compression and tension tests were used to determine the mechanical properties of HPFRCC materials. In order to investigate the effects of HPFRCC on improving and upgrading the joint strength, five half-scale exterior beam–column joint connections were tested under incremental cyclic lateral loading. The tested specimens consisted of two normal concrete control specimens with and without specific seismic details and three specimens of HPFRCC with different percentages of steel fibres. The cracking patterns, hysteresis behavior, bearing capacity, energy absorption and damping percentage of all test specimens were analysed and compared with the response of normal concrete specimens. Results show that the use of HPFRCC materials in the joint area improves seismic behavior and significantly increases load-bearing capacity, energy absorption and ductility. Moreover, it prevents the shear failure of the joint and the formation of the flexural plastic hinge in the beam.

中文翻译：

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HPFRCC钢纤维减少梁柱节点横向钢筋的最佳百分比

钢筋拥塞导致施工过程中出现问题，包括混凝土浇筑不当和混凝土振动。在这项研究中，已经研究了用高性能纤维增强水泥复合材料 (HPFRCC) 替代普通混凝土，以减少横向钢筋的数量并防止梁柱接头中的钢筋拥塞。单轴压缩和拉伸试验用于确定 HPFRCC 材料的机械性能。为了研究 HPFRCC 对提高和提升节点强度的影响，在增量循环侧向载荷下测试了五个半尺度外部梁柱节点连接。测试的试件包括两个带有和不带有特定地震细节的普通混凝土控制试件和三个具有不同钢纤维百分比的 HPFRCC 试件。分析了所有试件的开裂模式、滞后行为、承载力、能量吸收和阻尼百分比，并与普通混凝土试件的响应进行了比较。结果表明，在接头区域使用 HPFRCC 材料可以改善抗震性能，并显着提高承载能力、能量吸收和延展性。此外，它还防止了接头的剪切破坏和梁中弯曲塑性铰的形成。分析了所有试件的能量吸收和阻尼百分比，并与普通混凝土试件的响应进行了比较。结果表明，在接头区域使用 HPFRCC 材料可以改善抗震性能，并显着提高承载能力、能量吸收和延展性。此外，它还防止了接头的剪切破坏和梁中弯曲塑性铰的形成。分析了所有试件的能量吸收和阻尼百分比，并与普通混凝土试件的响应进行了比较。结果表明，在接头区域使用 HPFRCC 材料可以改善抗震性能，并显着提高承载能力、能量吸收和延展性。此外，它还防止了接头的剪切破坏和梁中弯曲塑性铰的形成。