Compressive Local Buckling of Pultruded GFRP I-Sections: Development and Numerical/Experimental Evaluation of an Explicit Equation

摘要

In this paper, a simple accurate equation to determine the local buckling critical stress of pultruded GFRP I-sections is developed. To assess the proposed expression, an experimental program comprising cross-sectional geometry measurement, material characterization, and compression tests on stub columns were carried out. Stubs having different flange-width-to-section-depth ratios extracted from 76 x 76 x 6.4 and 102 x 102 x 6.4-mm sections made with vinyl ester and polyester matrices were tested. The proposed expression is compared with experimental results, as well as results from numerical analyses using the finite-strip method (FSM). Finally, examples are presented and critical stresses are compared to those obtained based on other comparable research and by current design guidelines, demonstrating that the latter lead to conservative results. (C) 2014 American Society of Civil Engineers.