有些施工单位在型钢代换时沿用钢筋代换的概念,这不仅不完善,育时甚至还是错误的。型钢代换不同于钢筋代换,应认真考虑以下事项。一、材质应相同本着安全与经济的原则,型钢代换一般选用同种型号的型钢进行代换,如 A_3代 A_3,16Mn 代16Mn。不同型号的代换,应根据设计要求,对比钢材性能,确定能否使用。焊接结构还应考虑代换后钢材的可焊性。代换时应 Some construction units use the concept of replacement of steel bars during the replacement of steel sections. This is not only imperfect, but it is even wrong. Replacement of steel sections is not the same as reinforcing bar replacement. The following matters should be carefully considered. First, the material should be the same in line with the principle of safety and economy, steel generally replace the same type of steel used in the substitution, such as A_3 generation A_3, 16Mn generation 16Mn. Replacement of different models should be based on design requirements, comparing the performance of steel to determine whether it can be used. Welded structures should also consider the weldability of the steel after replacement. Substitution should be