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在自密实混凝土与老混凝土约束收缩试验的基础上,采用大型有限元软件ABAQUS进行了新老混凝土黏结约束收缩的有限元模拟.通过与试验结果进行比较,验证了有限元模型的可行性.并从应力分析的角度研究在约束收缩的作用下,新老混凝土黏结的应力分布规律.计算结果表明,在黏结面附近新混凝土受到明显的拉应力,而沿着试件高度方向拉应力不断减小直至转变成压应力;黏结面上的剪应力则在两端部最大,中部最小;修补混凝土较薄时新混凝土由于约束收缩而受到的拉应力较大;当新混凝土高长比为1/4时,混凝土上的拉应力最小.
Based on the constrained shrinkage test of self-compacting concrete and old concrete, the finite element simulation of the new-old concrete cohesion constraint shrinkage was carried out by the large-scale finite element software ABAQUS. The feasibility of the finite element model was verified by comparison with the experimental results. Stress distribution of the new-old concrete is studied from the aspect of stress analysis. The calculation results show that the new concrete is exposed to the tensile stress near the bonding surface and the tensile stress decreases along the height of the specimen Until the transformation into compressive stress; shear stress on the bonding surface at both ends of the largest, the smallest in the middle; repair of concrete thinner when the new concrete due to restraint contraction of the larger tensile stress; when the new concrete height ratio of 1/4 When the concrete tensile stress is minimal.