5.3 – Solar panel support systems – 3. Coupling systems on standing seam roof cladding 333 PULL-OUT STRENGTH DUE TO WIND LOADS ON THE SOLAR POWER PLANT (KN/SMQ) PULL-OUT STRENGTH OF THE CLIPS OR THE SUPPORT CLAMP (consider the lower value) KN/PZ NUMBER OF CLAMPS REQUIRED (PCS/SQM) = When using a support structure for solar panels that entail the use of clamps on standing seamcladdings, it is always necessary to check the compatibility of the loads between the two systems, since the actions of the single clamp are transmitted to the load-bearing structure through the entire roof stratigraphy, with the relative fixings. The structural verification can be carried out by means of complete laboratory certificates or by means of calculation reports based on the strengths of the individual components (solar panels, clamps, type and cladding material, clips and related fixings, type of continuous support and related fixings to the support structure). In the absence of a correct sizing of the cladding panel system, excessive loads on the single clamp can cause the standing seam edge to break and, in some cases, even the detachment of the cladding, together with the coupling clips. The longitudinal joint of the double standing seam cladding can be subjected, at any point, to a maximum stress that is transmitted to the underlying structure. To size and verify the number of clamps required, the minimum pull-out strength value of the clip and the clamp coupling on the standing seam edge is considered. On the basis of laboratory tests, the manufacturer of clamps and fixing clips provides information on the permanent loads (weight of the panels and substructure) and incidental loads (snow loads, wind and maintenance load) that the system can absorb in terms of pull-out, compressive strength and resistance to sliding in the direction of the pitch. It is advisable to consider the values of the strength tests relating to the most unfavorable load combination, making sure that the deformations due to the loads remain in the elastic field of the materials without permanent deformations. In the case of installed solar modules that are not coplanar with the roof pitch, the pull-out strength due to wind actions will be higher than for adjacent systems. Verification and sizing of the number of clamps required: EXCERPT
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