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前言反拱基础底板自1958年首先在我省淮阴地区水利建设中引用以来,迄今已广泛应用于大、中、小型的涵闸工程。从工程实践和试验资料可知,当基础反拱圆弧的矢高比取作1/8～1/10时,拱圈推力线与拱轴线基本重合,具有很高的承载能力,经济效果显著。通过二十年来的工程实践,虽已取得了不少的宝贵经验,但迄今还没有比较合理的计算方法,应用有限元法分析,对于多跨结构,因限于电子计算机的容量,目前尚有困难。此外,对反拱基础底板结构性能的认识,也还远未统一;虽然在反拱具有很高承载潜力这一点上,
Foreword Arch base plate since 1958, first in the province of Huaiyin water conservancy construction reference, has so far been widely used in large, medium and small Culvert project. From the engineering practice and experimental data, it can be seen that the thrust line of the arch ring basically coincides with the arch axis when the aspect ratio of the foundation anti-arch arc is taken as 1/8 to 1/10, which has high carrying capacity and remarkable economic effect. Although twenty years of engineering practice have gained a lot of valuable experience, so far no reasonable calculation method has been applied and finite element analysis has been applied. For multi-span structures, there are currently difficulties due to the limitation of the capacity of electronic computers . In addition, the understanding of the structural properties of the inverted arch base structure is also far from uniform; although the reverse arch has a high bearing capacity of this point,