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在工业与民用的建筑结构中,钢结构的屋架、桁架以及框架、排架等杆系结构是经常遇到的,而且用量很多。在屋架等杆系结构中的杆件,一般都是用等边或不等边角钢制作成T形、十字形的组合断面;在框(排)架的梁、柱杆件中,多数用三块钢板制作成H形断面的杆件。在制作这些杆件时,切割和焊接钢板、角钢的工作量是相当大的。造成这种切割、焊接工作量大的原因,主要是设计人员设计钢结构构件所选取的杆件断面,目前没有现成所要求的断面。所以,只好用现有的型钢
In the industrial and civil building structures, steel structures such as trusses, trusses, and frame and truss structures are often encountered and used in large quantities. The rods in the truss structure such as the roof truss are generally made of equilateral or unequal angle steel to form a T-shaped, cross-shaped composite section; most of the beams and truss members in the frame (row) frame Three steel plates are made into H-shaped sections. In making these rods, the workload of cutting and welding steel sheets and angle steels is considerable. The reason for such a large amount of cutting and welding work is mainly the design of the rod member cross-section selected by the steel structural member. There is no ready-made cross-section at present. Therefore, we had to use existing steel