Fiber-reinforced Polymer materials manufactured by the pultrusion process are increasingly being widely used in the construction industry due to their reasonable cost, high strength, lightweight, corrosion resistance, and convenient for installation. Due to its low modulus of elasticity and material is linear until failure, the design of PFRP structures are governed by instabilities rather than by strengths. Local instability of the column occurs when the compressive plates of the structure undergo local buckling in a sinusoidal pattern. This study analyzes the local buckling and post-buckling resistance of a PFRP column, taken into account defects of material properties and geometric imperfections. The results show that geometric imperfections have significant influence on the local buckling resistance and greatly reduce the post-buckling resistance of the column. A comparison between nonlinear buckling analysis and theoretical calculations by Kollár, as well as the experimental values, demonstrates that Kollár's theoretical formula is suitable for determining local buckling resistance of PFRP column. The author proposes to use this formula in the design calculations for load-bearing PFRP columns.
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