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以往用组合曲线法选择重力坝的经济断面,计算繁复费时,本文建议按优选法原理,用手算进行经济断面的选择。挡水坝段断面由三个参数确定,是多因素问题,先固定其中一参数简化为二因素问题,用纵横对折法或陡度法优选其余二个参数,然后再优选另一参数。溢流坝段为单因素问题,用平分法或0.618法进行优选。通过算例表明用优选法可比组合曲线法节省工作量50%左右,精度亦满足设计要求。
In the past, the economic curve of the gravity dam was selected by the combination curve method, and the calculation was complicated and time consuming. In this paper, according to the principle of optimization method, the choice of economic section was calculated by hand. The section of the dam section is determined by three parameters, which is a multi-factor problem. First, one of the parameters is reduced to be a two-factor problem. The other two parameters are optimized by the aspect ratio method or the steepness method, and then another parameter is preferred. Overflow dam section is a single factor, with bisecting or 0.618 optimization. The example shows that the optimal combination method can save about 50% of work load, and the precision can meet the design requirements.