Geometric nonlinear analysis of diaphragm-braced c-purlins

摘要

The method for geometric nonlinear analysis of diaphragm-braced C-purlins under gravity and wind uplift loading was presented. An updated Lagrangian formulation was adopted to establish the structural nonlinear equilibrium equation. Variable cylindrical arc length method had been used together with the modified Newton-Raphson method as the iteration strategy, to trace the equilibrium paths. Using this method, the behavior of C-purlins with diaphragm bracing at one flange only under gravity and wind uplift loading was investigated. The research results indicate that the diaphragm bracing can improve the behavior of C-purlins obviously and increase their load carrying capacity. Finally, based on theoretical and experimental results, pertinent conclusions are obtained.