Local Buckling of Thin-Walled Circular Steel Sections with or without InternalRestraint

摘要

In this report comprehensive series of tests are described and presented. Thetests were performed to examine the behavior of short thin-walled circular steel tubes with or without internal restraint. The tubes had diameter to thickness ratios of between 55 and 200 and a length to diameter ratio of 3.5. The tests included bare steel tubes loaded both with axially and at small eccentricities, and axially loaded steel tubes with an internal restraint medium. The material properties have been measured including residual stresses and geometric imperfections. The test strengths have been compared to strength models in design standards and specifications. The design standards were found to be conservative for eccentrically loaded circular steel tubes especially those using a linear interaction between the axial load and moment.