基于应变能的拱坝体型优化设计

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。

Dam shape's optimization design based on strain energy

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.