Abstract
This paper dealt with the restraint stiffness and strength requirements for axially loaded columns with lateral restraints, accounting for inelastic flexural buckling and random imperfections. Firstly, the buckling behaviour of restrained columns with classic deterministic imperfections was discussed to verify the effect of section dimensions, material properties and imperfection shapes. Then by using probabilistic distribution of imperfections along the column, extensive numerical results were gained through random imperfection finite element analyses, followed by restraint stiffness and restraint force proposed statistically corresponding to full restraining for columns. Results showed that, the full restraining stiffness of perfect columns proposed by Winter is sufficient for columns with imperfections and inelastic buckling. The traditional approach with predetermined artificial imperfections is deficient to evaluate the restraint force properly and rationally, due to ignoring the effect of random imperfections.
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