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Postfire performance of pultruded wood-cored GFRP sandwich beams
Highlights Post-fire failure mode mainly depended on the number of exposed sides and fire damage degree. Both GFRP and wood exhibited significant recovery in elastic modulus after cooling. New charring criterion for sandwich based on the critical decomposition degree. Development and implementation of integrated thermal and thermomechanical models for sandwich in Abaqus.
Abstract Wood-cored sandwich components have been extensively used in constructions of buildings and bridges. However, the existing studies on the postfire behavior of these components are very limited. This study aims to quantitatively evaluate the postfire residual properties of the pultruded wood-cored GFRP sandwich (PWGS) beams. This paper mainly comprises three parts: (i) review of fire experiment of the PWGS beams; (ii) postfire bending experiments conducted on the PWGS beams with different fire scenarios and (iii) numerical study on thermal and postfire thermomechanical responses. It was found the failure modes mainly depended on the number of exposed sides and the fire damage degree. For the three-sided fire-exposed specimens (except for the one with a 25 mm-thick calcium silica board), the progressive tension rapture of the charred fibers was the dominant failure mode. The other specimens, however, exhibited the brittle in-plane shear failure of the web. Moreover, after cooling down from 250 °C to 20 °C, the GFRP and wood exhibited 68 % and 35 % of recoveries of elastic modulus respectively. A three-dimensional thermal model with kinetic thermophysical sub-models considering heat transfer, water evaporation and decomposition was developed. The developed thermal model accurately predicted the temperature responses and charring profiles. Furthermore, a thermomechanical model considering the material damage was developed to accurately predict the elastic modulus distribution, postfire residual bending capacity and failure modes. This study provides the basis for the retrofit and the reinforcement of the fire-damaged PWGS beams. In the future, study on the fire resistance of the PWGS components in fire will be required.
Postfire performance of pultruded wood-cored GFRP sandwich beams
Highlights Post-fire failure mode mainly depended on the number of exposed sides and fire damage degree. Both GFRP and wood exhibited significant recovery in elastic modulus after cooling. New charring criterion for sandwich based on the critical decomposition degree. Development and implementation of integrated thermal and thermomechanical models for sandwich in Abaqus.
Abstract Wood-cored sandwich components have been extensively used in constructions of buildings and bridges. However, the existing studies on the postfire behavior of these components are very limited. This study aims to quantitatively evaluate the postfire residual properties of the pultruded wood-cored GFRP sandwich (PWGS) beams. This paper mainly comprises three parts: (i) review of fire experiment of the PWGS beams; (ii) postfire bending experiments conducted on the PWGS beams with different fire scenarios and (iii) numerical study on thermal and postfire thermomechanical responses. It was found the failure modes mainly depended on the number of exposed sides and the fire damage degree. For the three-sided fire-exposed specimens (except for the one with a 25 mm-thick calcium silica board), the progressive tension rapture of the charred fibers was the dominant failure mode. The other specimens, however, exhibited the brittle in-plane shear failure of the web. Moreover, after cooling down from 250 °C to 20 °C, the GFRP and wood exhibited 68 % and 35 % of recoveries of elastic modulus respectively. A three-dimensional thermal model with kinetic thermophysical sub-models considering heat transfer, water evaporation and decomposition was developed. The developed thermal model accurately predicted the temperature responses and charring profiles. Furthermore, a thermomechanical model considering the material damage was developed to accurately predict the elastic modulus distribution, postfire residual bending capacity and failure modes. This study provides the basis for the retrofit and the reinforcement of the fire-damaged PWGS beams. In the future, study on the fire resistance of the PWGS components in fire will be required.
Postfire performance of pultruded wood-cored GFRP sandwich beams
Zhang, Lingfeng (author) / Liu, Weiqing (author) / Omar, Ahmed Ahmad (author) / Ling, Zhibin (author) / Yang, Dongdong (author) / Liu, Yan (author)
Thin-Walled Structures ; 193
2023-09-27
Article (Journal)
Electronic Resource
English
Pultrusion , GFRP , Wood core , Sandwich beam , Postfire , Recovery
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