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通过建立钢筋混凝土细观损伤软化力学模型,结合统计技术考虑混凝土细观非均匀性,采用并行三维真实破坏过程分析Parallel-RFPA3D(Realistic Failure Process Analysis)系统,模拟了不同力学特性的钢筋对钢筋混凝土构件在单轴拉伸作用下变形场分布以及破坏形态,分析了不同力学特性的钢筋对裂缝数及裂缝间距的影响。研究发现,饱和裂缝间距随钢筋弹性模量值的增加而减小,而裂缝的数量则随钢筋弹性模量值的增加而增多。在试件破坏过程中出现了等间距裂缝现象并通过数值试验分析了此破坏现象的力学机理。
Through the establishment of the meso-damage softening mechanics model of reinforced concrete and considering the mesoscopic heterogeneity of the concrete with statistical techniques, the Parallel-RFPA3D (Realistic Failure Process Analysis) system is used to simulate the effect of different mechanical properties of reinforced concrete on reinforced concrete The deformation field distribution and failure mode under uniaxial tension were analyzed. The influence of rebar with different mechanical properties on the number of cracks and the crack spacing was analyzed. The results show that the spacing of saturated cracks decreases with the increase of the elastic modulus of the steel, while the number of cracks increases with the increase of the elastic modulus of the steel. The phenomenon of equidistant cracks appeared during the specimen failure and the mechanical mechanism of this failure phenomenon was analyzed by numerical experiments.