聚丙烯纤维再生细骨料混凝土受压损伤本构模型OA

To promote the application of green recycled con-struction materials in civil engineering,this study presents a statistical damage constitutive model for polypropylene fiber recycled fine aggregate concrete(PRFAC),based on the strain equivalence principle and the assumption that microel-ement strength follows a Weibull statistical distribution.The proposed model incorporates the Drucker-Prager failure criterion.By examining the influence of Weibull distribu-tion parameters m and S₀ on the stress-strain response,em-pirical relationships were established between the fine aggre-gate replacement ratio and the distribution parameters.This enabled the derivation of a theoretical stress-strain curve ac-counting for variable recycled fine aggragate(RFA)re-placement ratios.The experimental results show that the proposed model exhibits high agreement with measured data and effectively captures the increased brittleness of PRFAC with higher RFA replacement ratios.Moreover,increasing the replacement rate accelerates internal crack propagation,reduces deformability and toughness,and significantly has-tens the accumulation of internal damage in PRFAC.