EXPERIMENTAL EVALUATION ON RESIDUAL BENDING PERFORMANCE OF GFRP PULTRUDED BOX SECTION MEMBER EXPOSED FOR 20 YEARS

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  • 約20年間暴露されたGFRP引抜成形箱形断面部材に対する残存曲げ性能の実験的評価

Abstract

<p> GFRP pultrusion-molded materials are widely used as civil engineering structural members, but they are not widely used as main structural members due to the lack of data after long-term exposure and unclear durability. In this study, static four-point bending tests were conducted to clarify the residual performance of GFRP pultrusion-molded members after long-term exposure. Specimen used in the tests were GFRP pultruded square pipes exposed outdoors for approximately 20 years and on GFRP pultruded square pipes stored indoors for the same period. As a result, authors revealed that the residual stiffness and bending load capacity of these members decreased after the exposure. It was also confirmed that the deformation behavior could be generally evaluated based on Timoshenko's beam theory even after long-term exposure. The obtained bending load capacities were compared with the calculated load capacities using the local buckling stress and elementary beam theory, and it was shown that the deterioration of the corners due to exposure may accelerate the progress of corner failure with loading and reduce the effect of rotational restraint, resulting in a smaller local buckling load capacity.</p>

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