基于修正压力场理论的活性粉末混凝土梁抗剪承载力计算

Shear capacity of RPC beams based on modified pressure field theory

根据活性粉末混凝土梁受剪破坏过程与破坏形态,考虑纤维拉拔阻力对抗剪承载力的贡献,提出了改进的压力场模型,该理论计算值与本文12根高强钢筋活性粉末混凝土梁试验值吻合良好;斜裂缝截面纤维拉拔阻力承担的剪力值较大,约占总剪力40%~60%.同时对本文抗剪承载力理论计算值与文献中报道的试验结果进行了比较,发现：本文模型计算值与试验结果吻合较好,可用于活性粉末混凝土梁的抗剪承载力计算.

In this research, the improved pressure field models are proposed based on the shear failure process and failure modes ofreactive powder concrete （RPC） beams while considering the contribution of fiber pullout resistance to shear capacity. By comparing the calculated value and test results of 12 beams it was foand that the theoretical and experimental values are in good agreement; the pullout shear resistance of fibers at the diagonal crack cross-section contributes about 40% to 60% of the total shear capacity. Meanwhile values calculated using the proposed model of the paper were compared with the results of RPC beam test mentioned in reference. It was found that the calculated values of this model are in good agreement with the experimental results, and therefore it can be used for calculating the shear capacity of RPC beams.