Computational modelling of the crushing behaviour of pultruded glass-fibre reinforced polymer stub columns

Resumo

The popularity of pultruded glass-fibre reinforced polymer (pGFRP) profiles in construction stems from their lightness, strength, and durability. However, gaps remain in understanding their mechanics, notably the "true" material crushing failure. Current methodologies to estimate the compressive resistance of pGFRP profiles rely on small-scale tests on coupons, but there is evidence that the full-section compressive strength diverges considerably from that estimated from laminate testing. This study addresses that gap, investigating the crushing behaviour of pGFRP I-section profiles. To that end, computational models were developed, considering second-order effects due to imperfections and displacements. The model includes Gonilha’s damage initiation and progression criteria and also end surface irregularities. The study investigates the amplification of the end surface imperfection compared to a perfect flat end surface, providing insights into stress and deformations resulting from those geometrical defects, envisioning the enhancement of design guidelines for safer and more reliable pGFRP structures.