Flexible PV supports are categorized into single-layer cable-suspended structures, double-layer cable truss structures, fish-belly cable truss structures, and beam string structures.
A single-layer cable-suspended structure generally consists of main steel frames (composed of beams and columns), stay cables, and cable bodies as its main components. The cable bodies are two parallel cables aligned with the PV module plane, replacing conventional tension-bearing members. After the module-supporting cables are tensioned, they are fixed via anchors at the ends of the steel beams. Tensioning equipment is used to give the supporting cables stress stiffness for supporting the modules, and a self-balancing system is formed through end stay cables.
A double-layer cable truss structure is composed of main steel frames (composed of beams and columns), stay cables, cable bodies, and rigid struts between the cable bodies. The cable bodies consist of two parallel upper-chord cables and one upward-curvature lower-chord cable. Compared with the single-layer cable-suspended structure, it has additional load-bearing cables and rigid struts. A self-balancing system is formed by tensioning the cable bodies to obtain stress stiffness.
The fish-belly cable truss support system includes diagonal braces, columns, beams, struts, module-supporting steel cables, and cross-fixed steel cables. It features a simple structure and an aesthetic appearance. The columns and diagonal braces are fixed only at limited positions, using fewer support points and occupying less ground area. This reduces earthwork and lowers construction costs.
A beam string structure is made up of main steel frames (composed of beams and columns), stay cables, rigid upper chords, cable bodies, and rigid struts. The cable bodies serve as load-bearing cables, and unlike the three-layer cable truss, it has no stabilizing cables. The upper chord adopts a rigid structure, while the lower chord uses flexible cables. Under prestress, the struts provide elastic support for the upper chord to improve the stress state of the upper structure, thereby forming a self-balancing system.
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