在进行结构设计时,通常根据一系列的基本数据来确定截面的大小、配筋及其承载能力如能将截面相似原理用于结构设计,将使复杂的结构计算变得十分简单。截面相似原理的内容是:对某种材料如果其设计强度为常数,则两个材料相同、几何相似的截面,从强度上其承载能力之比对于力(拉力、压力、剪力)而言等于几何比例的平方, When designing a structure, the size of the section, the reinforcement, and its carrying capacity are usually determined based on a series of basic data. If the section-similarity principle can be used for the structural design, the complicated structural calculation will be very simple. The principle of cross-section similarity is that if the design strength of a material is constant, the two materials have the same, geometrically similar cross-section, and the ratio of the bearing capacity from the strength is equal to the force (tension, pressure, shear force). The square of the geometric proportion,