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纤维增强混凝土(FRC)具有受拉应变-硬化和多细微裂缝开展特性,替代普通混凝土作为连梁基体可减少连梁箍筋数量,增大连梁的受剪承载力、变形能力和损伤容限。根据FRC预制连梁屈服时连梁梁端埋入墙肢部分形成的力与约束弯矩平衡条件,提出预制连梁梁端埋入墙肢长度计算方法。连梁梁端埋入长度的大小主要取决于剪压比、跨高比和连梁截面高度的大小。将理论计算结果与试验结果和数值模拟进行比较,结果表明,建议的埋入长度计算公式较为合理,可作为FRC连梁梁端埋入长度设计的参考依据。
Fiber-reinforced concrete (FRC) is characterized by tensile strain-hardening and multi-fine micro-cracks development. The replacement of ordinary concrete as the coupling beam matrix can reduce the number of coupling beam stirrups, and increase the shear capacity, deformation capacity and damage tolerance of coupling beams. According to the force and restrained bending moment balance conditions formed by the end of the coupling beam embedded in the wall of the FRC prefabricated beam, the method for calculating the length of the buried wall of the prefabricated beam was proposed. The length of the buried end of the beam is mainly determined by the shear-pressure ratio, the height-to-height ratio, and the height of the cross-section of the coupling beam. Comparing the theoretical calculation results with the experimental results and numerical simulations, the results show that the proposed formula for calculating the buried length is reasonable, and can be used as a reference for the design of the buried length of the FRC coupling beam.