光伏支架高强冷弯C型钢檩条的受弯性能研究OA

This paper investigates the bending performance of high-strength cold-formed C-shaped steel purlins in PV brackets.Span with six loading point concentrated loading tests are conducted on LQ550 high-strength cold-formed C-shaped steel purlins(hereinafter referred to as"C-shaped steel purlins")under five different arrangements.Establish a finite element model for C-shaped steel purlins,and verify the accuracy of the model through test results of the bending performance of C-shaped steel purlins.Based on this model,explore the influence law of the relative slenderness ratio of purlins on their bending stability bearing capacity.According to the provisions of GB 50018-2002"Technical code for cold-formed thin-wall steel structures",the beneficial effect of support rod constraints on the bending stability bearing capacity of purlins is analyzed.Based on actual projects,conduct on-site loading tests on PV brackets using C-shaped steel support rods.The research results show that:1)the bending stiffness and bending stability bearing capacity of purlins are significantly improved by setting support rod constraints between spans,and the improvement effect of setting C-shaped steel support rod constraints is stronger than that of circular tube support rods.2)The C-shaped steel support rod can be regarded as an ideal lateral support,and the calculated length coefficient outside the purlin plane can be determined based on the setting of the C-shaped steel support rod.3)The on-site loading test has proven that the C-shaped steel support rod has a good restraining effect on the torsion of the purlin,fully verifying the applicability of the new PV bracket structure using C-shaped steel support rod system.