基于内聚力模型的配筋钢纤维混凝土结构承载性能研究

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中图分类号：TU318 文献标志码：A 文章编号：1000-582X（2025）08-054-13

doi：10.11835/j.issn.1000-582X.2024.275

Study on the bearing capacity performance of steel fiber reinforced concrete structures based on the cohesive zone model

MENG Dongdong'，HUANG Yiqun²，LIN Benqing？

（1.China Communications Construction Rail Transit Subsidiary，Beijing10l3oo，P.R.China;2.SchoolofCivil

Engineering，Fujian UniversityofTechnology，Fuzhou 350118，P.R.China; 3.Collge ofCivil Engineering， Fuzhou University， Fuzhou 350108，P.R. China）

Abstract： This study proposes a numerical modeling method based on the cohesive zone model to investigate the mechanical response and fracture mechanism of steel fiber reinforced concrete （SFRC） structures.In the proposed model，cohesiveelementsareused tostimulate potential fracturesurfacesand rebar-concreteinterfaces.A constitutive model for SFRC fracture surfaces is developed by considering mixed-mode damage evolution， interfacial friction，and the fiber bridging effect.Aditionally，a modified bond-slipconstitutive model for the rebar-concrete interfaceis proposed，accounting fornormal separation.Tovalidate theproposed model，asriesof four-point bending experiments on SFRC specimens are conducted.The simulation results closely align with experimental observation，confirming the model’sability to accurately capture both mechanical response and fracture behavior.Parametric analysis reveals that inadequate fiber content or improper friction coefficients significantly reduce structural bearing capacity and ductility.

Keywords：steel fiber reinforced concrete;cohesive zone model;constitutive model; fracture mechanics; fibei bridging effect; bond-slip relation

钢纤维混凝土作为普通混凝土的改进材料，指在常规混凝土内部加入一定掺量的钢纤维，使混凝土在抗拉强度、裂缝扩展控制以及韧性等方面得到了很好的提高，受到了广泛的关注，并且已在工程中有所应用。（剩余14772字）