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一、緒言+ 通常求鋼筋混凝土板极限荷重的方法是:先假定板的破坏形式,然后根据此破坏形式計算极限荷重。按照极限荷重的理論应該从一切可能的破坏形式中选取使极限荷重为最小的破坏形式,但在已有的研究中常将少数实驗結果找到的破坏形式推广应用到各种尺寸各种情况中去,因此破坏形式或多或少是随意选定的,未必能保証由此得出的荷重为最小值。本文的目的是在理論上此較严格地探討这个問題。有了这个基础,就可以比較容易地进一步探討合理布置鋼筋以节約鋼材的問題。
I. INTRODUCTION + The usual method for finding the ultimate load of a reinforced concrete slab is to first assume the failure mode of the slab and then calculate the ultimate load according to this type of failure. According to the theory of the limit load, we should choose the form of damage that minimizes the load from all possible forms of destruction. However, in the existing studies, the destruction forms found by a few experimental results are often applied to various sizes of situations. Therefore, the damage pattern is more or less randomly selected, and it may not be guaranteed that the resulting load is a minimum value. The purpose of this paper is to theoretically discuss this issue more rigorously. With this foundation, it is relatively easy to further explore the issue of rational arrangement of steel bars to save steel.