1.前言起重吊钩一般已标准化,可根据起重量选用标准吊钩,不必进行强度校核。吊钩的强度分析过去都按弹性曲梁的许用应力公式计算,即吊钩危险截面的最大应力不得超过许用应力。此许用应力对于碳钢,一般是将材料的流动极限除以安全系数。许用应力法是以构件的纯弹性应力分析为依据的,缺点在于没有和构 1. Introduction Lifting hook has been standardized, according to the lifting of the standard selection of hooks, without having to check the strength. In the past, the strength analysis of the hooks was calculated according to the allowable stress formula of the elastic curved beam, that is, the maximum stress of the dangerous section of the hook should not exceed the allowable stress. This allowable stress For carbon steel, it is generally the material’s flow limit divided by the safety factor. Permissible stress method is based on pure elastic stress analysis of components, the disadvantage is that there is no structure