基于应变能的拱坝体型优化设计

Dam shape's optimization design based on strain energy

考虑静力荷载作用下双曲拱坝的安全性,对最大主拉应力、拉应力区范围、整体安全度和抗屈折稳定等安全指标进行了综合分析。提出以坝体应变能指标作为拱坝体型优化的安全目标函数,建立拱坝体型优化设计模型并采用进化策略进行求解。以白鹤滩拱坝为例,优化体型与初始体型相比,体积方量减少1.58万m3,坝体应变能、最大主拉应力、最大主压应力以及位移等结构响应量都得到了降低,优化效果明显。

By taking the safety of parabolic double-curvature arch dam which is under the action of static loads, the safety indexes of maximum principal tensile stress, scope of tensile stress zone, integral safety degree and anti-elastic buckling stability are studied comprehensively. The objective function of dam shape＇s optimization is set to be the strain energy of dam. To obtain the solution of dam shape＇ s optimization design model, evolution strategy is adopted. Take Baihetan arch dam for example, by comparing optimization shape with the original shape, the volume was reduced by about 15800m^3, the structure response of the strain energy of dam, maximum principal tensile stress, maximum principal compressive stress as well as displacement were all decreased.