钢衬钢筋钢纤维混凝土压力管道非线性有限元分析

Nonlinear Finite Element Analysis of Steel Lined Steel Fiber Reinforced Concrete Penstock

针对钢衬钢筋混凝土压力管道在运行期因裂缝过宽导致的结构耐久性问题,在混凝土中掺入体积率分别为0.5%、1.0%、1.5%、2.0%的钢纤维形成钢纤维混凝土,基于模型试验获得的钢纤维混凝土的拉伸软化曲线,采用大型数值分析平台ABAQUS仿真分析了钢衬钢筋钢纤维混凝土压力管道受力开裂的全过程,并与原钢衬钢筋混凝土压力管道的模型试验结果进行了对比分析。结果表明,在相同内水压力荷载下,钢衬钢筋钢纤维混凝土压力管道的承载能力与普通钢衬钢筋混凝土压力管道相比,不仅其初裂荷载有所提高,管道的最大裂缝宽度明显降低,钢材的应力值也随钢纤维体积率的增加而减少。

In terms of solving the problem of structure durability for conventional steel lined reinforced concrete penstock,steel fiber concrete were adopted to control crack width of out packed reinforced concrete.The steel fiber reinforced concrete was prepared by mixing the steel fiber by the volume ratio of 0.5%,1.0%,1.5%and 2.0%,and the tension softening curve of steel fiber reinforced concrete was obtained based on the model experiment.The whole process of cracking of steel lined steel fiber reinforced concrete penstock was simulated by ABAQUS.By comparing with the original penstock design,the results show that the bearing capacity of steel fiber reinforced concrete penstock is higher than that of the original under the same internal water pressure loads.The initial cracking loads of penstocks increases and the concrete cracking significantly decreases.The stress values of steel also decrease with the increase of fiber volume fraction.