Mode interaction in triple-bay prestressed stayed columns. (January 2017)

• Record Type: Journal Article
• Authors: Yu, Jialiang; Wadee, M. Ahmer
• Is Part Of: International journal of non-linear mechanics. Volume 88(2017)
• Page Start: 47
• Page End: 66
• Publication Date: 2017-01
• Subjects: Interactive and cellular buckling -- Mode jumping -- Analytical and finite element modelling -- Prestressing; Nonlinear mechanics -- Periodicals; Mécanique non linéaire -- Périodiques; Nonlinear mechanics; Periodicals; 531
• DOI: 10.1016/j.ijnonlinmec.2016.10.012
• Languages: English
• ISSNs: 0020-7462

Abstract

Abstract: Prestressed stayed columns are an innovative type of structural system where the compressive load-carrying capacity can be enhanced through prestressed external cable stays. A nonlinear analytical model for prestressed stayed columns with multiple crossarm systems along the column length, based on the Rayleigh–Ritz method, is presented that captures modal interactions for perfect geometries explicitly for the first time. It is demonstrated that the theoretical compressive strength enhancements under certain configurations can only be obtained at the expense of triggering a sequence of destabilizing bifurcations. This can give rise to dangerously unstable interactive post-buckling behaviour including so-called 'mode jumping' and 'snaking' phenomena. Parametric spaces where the system is most susceptible to the modal interactions are identified and it is for those configurations that the system is likely to be highly sensitive to initial imperfections. The model is validated using a nonlinear finite element model formulated within the commercial code ABAQUS and excellent comparisons are obtained.