梁的最大弯矩和剪力是钢筋混凝土梁正截面承载力设计、斜截面承载力设计的依据,而单跨简支梁的内力计算又是连续梁、框架梁等超静定结构内力计算的基础。因此,对初学者来说,熟练地掌握单跨简支梁的内力计算是最基本的、最重要的一课。一、结构的平衡条件结构在平面一般荷载的作用 The maximum bending moment and shear force of the beam are the basis for the design of the bearing capacity of the normal section and the bearing capacity of the inclined section of the reinforced concrete beam. The calculation of the internal force of the simply supported beam is the calculation of the internal forces of the statically indeterminate structure of continuous beam, frame beam and so on. basis. Therefore, for beginners, mastering the calculation of the internal forces of a single span simple beam is the most basic and most important lesson. First, the structure of the balance of conditions in the plane of the structure of the general load