悬臂梁桥是苏联先进的桥型之一,它在结构上完全具有连续梁的优点(即具有结构的连续性);但无连续梁的缺点(即对支点沉陷之敏感)。因之在结构学上有的就叫它为“有铰连续梁”。由于在结构上有以上的优点,所以它能较简支梁增大跨径,并且它可以修建在可能发生不平均下沉的基础上。这些特性,对桥梁结构特别适应。解放后,我国所修建的公路永久式大桥,多采用悬臂梁桥。这些大桥大多参照苏联的标准图,由我们自行设计的。为了便利悬臂梁的计算,今就以下的几个问题提出讨论: (一)带有吊梁的短悬臂的计算因该短悬臂梁的侧面为阶梯形,所以受力情况特别不利,使它构成悬臂梁结构上的最大缺点。以往在计算此短臂时,皆用试算法决定危险断面。其方法如下: 如P=62,400公斤梁宽=bo=70公分 The cantilever bridge is one of the advanced bridge types of the Soviet Union. It has the structural advantage of continuous beams (ie, structural continuity), but no shortcomings of continuous beams (ie, the sensitivity to fulcrum subsidence). Therefore, some of them are structurally called “hinged continuous beams.” Due to its structural advantages, it can increase the span compared to a simple beam, and it can be built on the basis of possible uneven subsidence. These characteristics are particularly adapted to the bridge structure. After the liberation, the permanent highway bridges built in our country use more cantilever bridges. Most of these bridges refer to the Soviet Union’s standard map, designed by us. In order to facilitate the calculation of the cantilever beam, a discussion is put forward on the following several issues: (1) Calculation of a short cantilever beam with a suspension beam Because of the stepped shape of the side of the short cantilever beam, the stress situation is particularly disadvantageous, Cantilever structure of the biggest drawbacks. In the past in the calculation of this short arm, are used to determine the dangerous section of the test algorithm. The method is as follows: If P = 62,400 kg beam width = bo = 70 cm