钢纤维增强混凝土细观压缩断裂模拟与性能分析

摘要/Abstract

摘要： 韧性城市构筑需要更多高强、高韧的混凝土基础设施,现有钢纤维增强混凝土(SFRC)细观力学模型与断裂性能模拟研究仍存在挑战。本文借助Python软件对Abaqus前处理二次开发,建立了SFRC三维细观模型,全局插入内聚力单元模拟骨料与混凝土基体之间的界面,研究钢纤维体积率V_SF、混凝土基体强度、骨料粒径对SFRC单轴压缩断裂性能的影响。结果表明:V_SF在0%~2.0%时,V_SF越大,SFRC抗裂性能越好,且残余应力更大;V_SF为2.0%时,SFRC应力较未加入钢纤维混凝土提高了60.64%;当基体强度增加时,SFRC的韧性也随之提高,C60、C80混凝土所对应的最大应力值与C40混凝土相比分别提高了66.48%、91.39%,SFRC的应力-步长曲线在弹性阶段变得更陡峭;骨料粒径在5~7 mm时,随着骨料粒径的增加,SFRC的抗裂性能显著增强。显然将分散、不定向的韧性钢纤维加入脆性混凝土基体中可有效增强混凝土设施的抗震韧性和抗裂性能。

关键词: 混凝土, 细观模型, 钢纤维增强混凝土, 内聚力单元, 抗裂性能, 界面韧性

Abstract: Higher strength and toughness concrete infrastructures are essential for resilient city construction. There are still some challenges in the existing mesoscopic model and fracture performance simulation research of steel fiber reinforced concrete (SFRC). Here, with the secondary development of Abaqus pre-processing method aiding with Python software, a three-dimensional mesoscopic model of SFRC was established, and cohesive units were inserted globally to simulate the interface between the aggregate and concrete matrix to study the effects of volume content of steel fiber V_SF, concrete matrix strength, and particle size of aggregate on the uniaxial compressive fracture performance of SFRC. Results show that, in the range of 0% to 2.0%, the larger the V_SF is, the superior the rupture resistance of SFRC is, and the greater the residual stress is. When V_SF is 2.0%, the stress of SFRC is 60.64% higher than that of concrete without steel fiber. When the strength of concrete matrix increases, the maximum stress corresponding to C60 and C80 grade concrete increases by 66.48% and 91.39%, respectively, compared with that for C40 grade concrete, the toughness of SFRC also increases and the stress-step curve of SFRC becomes steeper in the elastic phase. In the 5~7 mm range of aggregate particle size, the rupture resistance of SFRC increases significantly with the increase of aggregate particle size. Therefore, it can be concluded that the incorporation of dispersed, non-directional ductile steel fiber into a brittle concrete matrix can effectively enhance the seismic toughness and rupture resistance of the corresponding concrete infrastructure.

Key words: concrete, mesoscopic model, steel fiber reinforced concrete, cohesive unit, rupture resistance, interfacial toughness

中图分类号:

TU58⁺9

陶雪君, 罗健林, 樊康鑫, 陈杰, 朱敏, 高乙博. 钢纤维增强混凝土细观压缩断裂模拟与性能分析[J]. 硅酸盐通报, 2023, 42(11): 3884-3894.

TAO Xuejun, LUO Jianlin, FAN Kangxin, CHEN Jie, ZHU Min, GAO Yibo. Meso-Compressive Fracture Simulation and Performance Analysis of Steel Fiber Reinforced Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(11): 3884-3894.

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