沙牌碾压混凝土拱坝损伤开裂分析

摘要

The thermal crack of RCC arch dam is different from the thermalcrack of the general dam. In order to decay the thermal stress efficiently, the structural joint design should cooperate with simulating analysis on the stress field of RCC arch dam. Based on the 3-D nonlinear stress field simulating analysis of Shapai RCC arch dam, a damage behavior of Shapai RCC arch dam is studied in this paper. In the computation of stress field, the factors, such as temperature load, deadweight of concrete, water potential, creep stress and self-expansion of concrete, are involved in the program. A rule of damage behavior is obtained from the results of simulating analysis and it will be helpful for structural joint design o f Shapai RCC arch dam.%碾压混凝土拱坝的温度裂缝与一般混凝土坝的温度裂缝有本质区别.为了有效控制坝体开裂,要求分缝设计与应力场仿真分析密切结合.因此进行了沙牌碾压混凝土拱坝三维非线性应力场的全过程仿真分析,在此基础上对拱坝在不同分缝情况下的损伤开裂行为进行了研究.计算中考虑了温度荷载、自重、静水压力、混凝土徐变和自生体积变形等情况.通过计算分析得出了沙牌碾压混凝土拱坝的开裂规律,为沙牌碾压混凝土拱坝的分缝设计提供了依据.