Truss structure features
The force of each rod is mainly uniaxial tension and compression. Through the reasonable arrangement of the upper and lower chords and the webs, the bending moment and shear force distribution inside the structure can be adapted.
Since the horizontal pulling and pressing internal forces achieve their own balance, the entire structure does not generate horizontal thrust to the support. The structure is flexible and the application range is very wide.
Compared with the solid webs (that is, the beams we generally see), in the bending resistance, since the tensioned and compressed sections are arranged at the upper and lower ends, the internal force arm is increased, so that the same amount of material is used. Achieve greater bending strength.
In terms of shear resistance, the shear force can be gradually transmitted to the support by properly arranging the web. In this way, whether it is bending or shearing, the truss structure can fully exert the strength of the material, which is suitable for various spans of building roof structures.
More importantly, it transforms the complex stress state inside the solid web under transverse bending into a simple tensile and compressive stress state in the truss member, which enables us to intuitively understand the distribution and transmission of forces and facilitate the structure. Change and combination.
