Modeling of circular concrete-filled steel tubes subjected to cyclic lateral loading

摘要: Abstract In this paper, a simple and efficient yet fairly accurate analytical model for the cyclic behavior strength capacity of circular concrete-filled steel tubes (CFT) under axial load cyclically varying flexural loading is developed. Firstly, an nonlinear finite element created using ATENA software. The validity established by comparing its analyses results with those experimental data published in pertinent literature. Then, model, extensive parametric study conducted to create broad databank hysteretic CFTs, involving numerous CFT columns different diameter thickness ratios, tube yield stress concrete strength. On basis databank, empirical expressions are developed evaluate phenomenological parameters well-known Ramberg-Osgood model. Additionally, relations providing direct representation ultimate constructed validated. Comparisons between demonstrate that proposed can describe efficiently reliably lateral loading.