应力指数法在拱坝主应力满应力设计中的应用

阐述用应力指数法实现拱坝主应力满应力设计的思路和方法要点 ,介绍等截面圆弧拱坝及变截面抛物线拱坝两种算例成果 .算例表明 ,应力指数 βi 相对固定的应力指数法是适应拱坝主应力满应力优化的有效、可行的方法 ,只需在原有的拱坝应力分析程序的基础上稍加扩充即可实现 .对于初始方案基本合理的拱坝 ,一般迭代 5～8次 ,优化后坝体方量可节省 1 2 %～ 2 0 % .

Application of stress-index method to principal stress and ultimate stress design for arch dams

The train of thought and key points of the stress index method are described for the principal stress and ultimate stress design of arch dams. Two arch dams are calculated as examples: one is a prismatic circular arch dam, and the other is a non prismatic parabolic arch dam. The calculated result shows that the stress index method, with a constant value of β i , is a feasible method for optimization of the principal stress and ultimate stress of arch dams, and can be realized only by slight expansion of the original program used for analysis of arch dam stresses. For those arch dams with reasonable original design schemes, the optimization of dam stresses can be realized by 5～8 times of iteration. The optimization can help save 12%～20% earthwork in dam construction.