Akademik Veri Yönetim Sistemi
Structures, cilt.60, 2024 (SCI-Expanded)
CFS members are prone to geometric imperfections due to their slenderness, even if the observed imperfections are minor. The main aims of this study are to gather imperfection magnitudes reported in the literature to propose a new set of simple expressions for channel sections and to assist researchers while selecting the combination coefficients and magnitudes for geometric imperfections of intermediate-length columns. To propose predictive expressions and to determine characteristics of geometric imperfections, detailed geometric imperfection measurements with a 3D optical scanner were performed, and available data on geometric imperfection magnitudes in the literature was used. The performance of the proposed expressions was then compared with the existing expressions. Additionally, a series of compression tests were performed on members with varying lengths and friction-bearing support conditions, and finite element (FE) models were constructed and calibrated. The calibrated FE models were used to perform a parametric study which consisted of 352 FE models investigating the effects of combination coefficients and magnitudes for local and distortional geometric imperfections. The results of the FE models, which were integrated with the geometric imperfection magnitudes obtained using the proposed and existing expressions, were later compared with the obtained test results and design predictions obtained using the current design rules of AISI S100–16. The outcomes of this study could be used to select accurate and reliable geometric imperfection magnitudes for numerical modeling of channel sections and investigate the effects of the combination coefficient of geometric imperfections on the strength of the intermediate length CFS lipped channel columns.