从优化角度看重力坝三角形断面的物理意义

为探讨重力坝三角形基本断面设计的物理机制,利用细啃渐进结构优化(ESO)方法的基本概念,建立了坝顶顺河向位移敏感度准则.以四边形为初始域,以重力坝的稳定和坝踵拉应力为约束条件,对基本荷载作用下的重力坝基本断面形状进行优化.不同网格、不同初始域、不同坝高工况下的结果表明,三角形基本断面是重力坝在基本荷载作用下使得坝顶位移最小的一种断面形状.

Physical meaning of triangular section of gravity dams in view of optimization

A criterion of the minimum displacement of the top of dam bodies along the stream direction was developed by use of the basic concept of nibble evolutionary structural optimization(ESO) for discussion of the physical meaning of the triangular section of gravity dams.The shape of cross section of gravity dams under basic loads was optimized from an initial quadrilateral region with the stability of dam bodies against sliding and the tensile stress in dam heels taken as restraints.The results in the cases of different meshes,different initial regions,and different heights of dam bodies show that the triangular section can ensure the minimum displacement of the top of dam bodies under basic loads.