混凝土受拉软化特性对钢衬钢筋混凝土管道承载性能的影响研究

Study on the Effects of Tension Softening Characteristics on Bearing Performance of Steel Lined Reinforced Concrete Penstock

分别采用课题组试验所得的混凝土软化曲线和混凝土结构设计规范给出的混凝土软化曲线,对三峡水电站钢衬钢筋混凝土压力管道进行非线性有限元计算,将压力管道外围混凝土的裂缝分布、裂缝宽度、钢衬和钢筋的应力状态、管道的极限承载能力等与模型试验成果进行对比分析。研究表明:采用试验所得软化曲线进行有限元计算分析所得背管混凝土的初裂荷载、损伤区域、裂纹条数以及钢材应力与模型试验的结果更为吻合。

The concrete softening curves obtained from the test results of research group and the codes for concrete structure design respectively are used to carry out the nonlinear finite element calculation of steel lined reinforced concrete penstock of Three Gorges Hydropower. Then the distribution of peripheral concrete cracks, the width of crack, the stress states of steel liner and reinforced bars, and the limit bearing performance of penstock are compared with the results of model tests. The results show that the initial crack load, damage region, crack number and steel stress of penstock concrete obtained by finite element calculation based on test softening curve are more consistent with the results of model tests.