Design Principle of Fish Belly Beam

 

Fish Belly Beam


The design principle of the fish-belly beam is mainly based on its unique structural form, which has a beam with a large middle part of the cross-section and then gradually decreases towards the ends, similar to the shape of a fish's belly. The main purpose of this design is to increase the bending strength of the beam while saving material.

Specific applications of fish-belly girders include structures consisting of steel strands and steel trusses with spans that can reach over 60m. By applying prestressing force to the steel strands, a large reaction force can be generated to the supporting bars of the fish-belly girders, which significantly reduces the bending moment acting on the purlins of the fish-belly girders and improves the bending stiffness of the girders. In addition, the prestressed fish-belly girders can be connected together with angle braces or buttress girders through specialized nodes to form a support system for deep foundation pits.


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