前言液压伸缩臂汽车起重机和轮胎起重机,当前正在向大起重量和高起升高度方向发展。随着起重量的增大和起升高度的提高,设计轻型的吊臂具有重要的意义。为了减轻吊臂的重量,其关键之一,就是使腹板的高厚比在保证满足局部稳定条件的前提下尽可能地增大。因此,可以说腹板的局部稳定问题的研究是减轻吊臂自重的关键。本文力求利用位能变分原理,对各种不同厚度的板组合起来的箱形吊 Preface Hydraulic telescopic boom truck cranes and tire cranes are currently moving towards greater weight and height. With the increase of lifting capacity and lifting height, the design of lightweight jib is of great significance. In order to reduce the weight of the boom, one of the key is to make the height ratio of the web as large as possible under the premise of satisfying the local stability conditions. Therefore, it can be said that the study of the local stability of the web is the key to reducing the deadweight of the boom. This article seeks to use the bit-energy variational principle, a variety of different thickness combinations of box-shaped hanging