悬挑构件是建筑物的重要组成部分之一。常见的有挑阳台、挑走廊、挑檐、雨篷、遮阳板、悬挑扶梯板、悬挑看台和某些厂房的悬挑工作平台等。固定悬挑构件的方法很多,有的将端部直接嵌入墙内,有的与钢筋混凝土结构相连结,有的则采用其他方法加以锚固。悬挑构件与一般构件相比多了一个抗倾覆条件,这已是众所周知的常识。然而,实际上由于悬挑构件倾覆而造成的重大事故和伤亡仍屡见不鲜。产生事故的原因,不外乎施工和设计两方面。对于抗倾覆计算,现行的方法也欠合理,例如有的设计手册(《钢筋混凝土结构计算图表》,湖北 Cantilevered components are one of the important components of a building. Commonly there are picking balconies, picking corridors, provocations, awnings, sun visors, cantilevered escalators, cantilever stands, and cantilevered work platforms for certain plants. There are many methods for fixing the cantilevered components, some of which embed the ends directly into the wall, some of which are connected with the reinforced concrete structure, and some of which are anchored with other methods. It is common knowledge that cantilevered members have one more anti-overturning condition than ordinary ones. However, in fact, major accidents and casualties caused by the overturning of cantilevered components are still common. The cause of the accident is nothing more than construction and design. For anti-overturning calculations, the current method is also unreasonable. For example, some design manuals (“Structural calculations for reinforced concrete structures”, Hubei