What is a fish-belly steel joist?

 The structure of this fish-belly steel joist is composed of the upper chord, a web, and a folded lower chord, the ends of the folded lower chord are connected with the ends of the upper chord, and the upper and lower ends of the web are welded between upper chord and folded lower chord in the form of bending moment graphic arrangement, which is like the belly of a fish, and there are also end plates connected with the ends of upper chord. Compared with the existing technology, the fish-belly steel joist has the features of reasonable design, simple structure, easy processing, easy to use, labor-saving and time-saving, and large bearing capacity, and therefore, it has a good value of popularization and use.

 fish-belly steel joist


One of the characteristics of a fish-belly steel joist is that it is surrounded by a top chord and a folded bottom chord to form an approximate simple bending moment diagram, which is shaped like the belly of a fish. The axial force between chords tends to be equal and the axial force of the web is very small, which has the best technical and economic performance and is the ideal joist in various forms; Characteristic No.2: All forms of web are compression rods and can be without connecting plates; Characteristic No.3: Upper chord is steel pipe with diameter of 48mm, which can be used as scaffolding pipe and fasteners for the fixing and stabilizing of joist and there is no need to add other accessories, while the lower chord and web are reinforced bars for the purpose of self-processing at construction sites and repairing after deformation. The lower chords and web bars are steel bars so that the site can process them by itself and repair them after deformation. The end plate is connected by a 6mm×60mm×220mm steel plate, which is welded with upper and lower chords on both sides.

Compared with the existing technology, the fish-belly steel joist has the features of reasonable design, simple structure, easy processing, convenient use, and large bearing capacity, thus, it has a good value in popularization and use.

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