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- 2018
钢纤维增强超高性能混凝土抗压性能的细观数值模拟
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Abstract:
利用LS-DYNA软件在细观层次上建立了三维钢纤维增强超高性能混凝土（Steel fiber reinforced ultra-high performance concrete，SF/UHPC）圆柱体试件有限元模型，对其轴心受压下的力学性能和裂缝发展进行了数值模拟。在验证细观数值模型的有效性和合理性的基础上进行参数分析，着重研究了钢纤维体积率、钢纤维长径比、形状效应和尺寸效应对超高性能钢纤维混凝土抗压强度、韧性和破坏形态的影响。最终，根据模拟结果拟合了超高性能钢纤维混凝土抗压强度计算公式。结果表明：三维超高性能钢纤维混凝土细观模型可以较好地模拟单轴受压应力条件下混凝土的静力性能和损伤破坏机制，所拟合的公式也能较好地预测超高性能钢纤维混凝土的抗压强度。 The finite-element model of three-dimensional steel fiber reinforced ultra-high performance concrete (SF/UHPC) cylindrical specimen was developed on the mesoscopic level by utilizing LS-DYNA, and the mechanical properties and crack development of which under axial compression were numerically simulated. Based on the verification of the validity and rationality of above-mentioned mesoscopic numerical model, the effects of steel fiber volume fraction, aspect ratio, shape and size on compressive strength, toughness and failure mode of SF/UHPC were studied emphatically. Finally, the formula for predicting the compressive strength of SF/UHPC was fitted according to the simulation results. The results indicate that the developed mesoscopic model in this paper for simulating SF/UHPC can well characterize the static performance and damage mechanism of concrete under uniaxial compression stress, and the fitting formula can also predict the compressive strength of SF/UHPC. 国家重点基础研究发展计划（2015CB058002），天津市科技支撑计划项目（14ZCZDSF00016）
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