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Two dimensional simulation of thermomechanical response of rectangular GFRP profiles under fire

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Document pages: 17 pages

Abstract: In the past three decades, one-dimensional thermal models have been used to estimate the thermal response of glass fiber reinforced polymer (GFRP) materials and structures. However, the temperature gradient and mechanical degradation of the entire cross section cannot be accurately evaluated. In order to solve this problem, a two-dimensional (2D) thermomechanical model is established to predict the thermal and mechanical response of rectangular GFRP pipe under single-sided ISO-834 fire. The governing heat transfer equation under two-dimensional thermal boundary conditions is discretized by alternating direction implicit (ADI) method and solved by Gauss Seidel iterative method. Then, considering the elastic modulus DEG, the temperature dependent mechanical response is obtainedadation from glass transition and decomposition of resin. The temperatures and midspan deflections of available experimental results can be reasonably predicted. The overestimation of deflections could be attributed to the underestimation of bending stiffness. This model can also be extended to simulate the thermomechanical responses of beams and columns subjected to multiside fire loading, which may occur in real fire scenarios.

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