Introduction to the Classification of Flexible Photovoltaic Mounting Systems

Flexible mounting systems are classified into single-layer cable-suspended structures, double-layer cable truss structures, fish-belly cable truss structures, and beam-string structures.

(1) Single-Layer Cable-Suspended Structure
A single-layer cable-suspended structure typically consists of main steel frames composed of beams and columns, diagonal bracing, and cable bodies as the primary components. The cable body comprises two parallel tension cables aligned with the plane of the photovoltaic modules, replacing conventional tension members. After the tensioning of the module-supporting cables is completed, they are anchored at the ends of the steel beams. Tensioning equipment is used to apply stress stiffness to the supporting cables, enabling them to bear the modules. The system relies on end diagonal bracing to form a self-balancing system.

(2) Double-Layer Cable Truss Structure
A double-layer cable truss structure consists of main steel frames composed of beams and columns, diagonal bracing, cable bodies, and rigid struts between the cables. The cable body includes two parallel upper chords and a lower chord with upward curvature. Compared to the single-layer cable-suspended structure, this design incorporates additional load-bearing cables and rigid struts. Stress stiffness is achieved through tensioning of the cable body to form a self-balancing system.

(3) Fish-Belly Cable Truss Structure
The fish-belly steel cable mounting system includes diagonal supports, columns, crossbeams, struts, module-supporting steel cables, and cross-fixing steel cables. It features a simple and aesthetically pleasing design, with limited fixed positions for columns and diagonal supports. This system uses fewer support points, occupies less ground area, reduces earthwork, and lowers construction costs.

(4) Beam-String Structure
A beam-string structure consists of main steel frames composed of beams and columns, diagonal bracing, a rigid upper chord, cable bodies, and rigid struts. The cable body serves as the load-bearing cable. Compared to the triple-layer cable truss structure, it lacks stabilizing cables. The upper chord employs a rigid structure, while the lower chord uses flexible tension cables. Under prestress, the struts act as elastic supports for the upper chord, improving the stress state of the upper structure and forming a self-balancing system.