Mode interaction in thin-walled I-section struts with semi-rigid flange-web joints

作者：Bai Li; Wadee Ahmer^*

来源：International Journal of Non-Linear Mechanics, 2015, 69: 71-83.

DOI：10.1016/j.ijnonlinmec.2014.11.023

• Mode interaction
• Global buckling
• Local buckling
• Snaking
• Non-linear mechanics

A recently developed variational model that describes the non-linear interaction between the global and local buckling of a thin-walled I-section strut under pure compression is extended to include semi-rigid flange-web connections. A formulation combining the Rayleigh-Ritz method and continuous displacement functions is used to derive a system of differential and integral equilibrium equations for the structural component. Cellular buckling, observed in the case where the web is assumed to provide no more than a simple support to the flanges, is found to be rapidly eroded by increasing the connection rigidity, although the local buckling wavelength still reduces as the post-buckling deformation is increased. The model is validated using finite element analysis; the results compare very well particularly when a high rigidity between the section web and flanges is simulated.

• 出版日期2015-3