一、影响最优截面选择的主要因素予应力钢梁已在理论、实验和应用实践中,证明是一种节约钢材、降低造价的新型结构。随结构体系、荷载类型和予加应力方法的不同,钢材节省可达10—40％,造价降低10—15％。予应力钢梁的经济特性,是由于采用了各种形式的最有利的自应力系统;在梁的高度范围内或梁下,配置高强度钢索,在钢索中予加一定的拉力后,则梁身得到了与外荷 First, the main factors affecting the choice of optimal section Stress steel beams have been in theory, experiment and application practice, proved to be a new type of structure to save steel and reduce costs. With the different structural systems, load types and prestressing methods, steel savings can be as much as 10–40%, and cost reductions can be 10–15%. The economic characteristics of prestressed steel beams are due to the use of various forms of the most favorable self-stressing system; in the height range of the beam or under the beam, the high-strength steel cable is configured and after a certain tension is added to the steel cable, Then the beam body got with the load