LRFD Approach for Channel Section FRP Columns

摘要

Pultruded fiber reinforced plastic (FRP) channel section columns can develop flexural, torsional, and flexural-torsional buckling modes when subjected to a gradually increasing axial load. In this paper, the results of a thoeretical and experimental investigation on a FRP channel section column are first presented. Buckling and squash load formulas for the problem are summarized and used for plotting column maximum load envelope. It is also found that the load-carrying capacity of channel section columns can be dramatcially increased by 'equalizing' the cross-sectional depth and width. Finally, based on the column formulas, a Load and Resistance Factor Design (LRFD) approach is outlined and its use demonstrated through practical analysis and design examples.