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Finite element modeling for the progressive collapse analysis of steel stiffened-plate structures in fires

Paik, J-K; (2020) Finite element modeling for the progressive collapse analysis of steel stiffened-plate structures in fires. Thin-Walled Structures 10.1016/j.tws.2020.107262. (In press). Green open access

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Abstract

In this study, novel honeycomb structures with twisted feature were designed and manufactured by laser powder bed fusion (LPBF). The manufacturability, microstructure evolution of LPBFed honeycomb components with twisted feature were studied. The influence of twist angle on the compressive behavior of components was experimentally investigated and the underlying mechanism was revealed using FE simulation. Results revealed that the material relative density of LPBFed components was reduced with the increase of twist angle, caused by the enlarging overhanging area. Different cooling rate of melt pool at different parts along the building direction resulted in different microstructures. The twist angle significantly affected the compressive behaviors of honeycomb structures. When the cell number along each side was 3, the honeycomb structure with 30° twist angle exhibited the most uniform stress distribution under compression, leading to the highest specific compressive strength and energy absorption ability. The influence of cell number and wall thickness on compressive properties of honeycomb structures with 30° twist angle were investigated through finite element simulation, and results revealed that the structure with 0.75 mm wall thickness and 3 unit cells along each side showed the highest specific energy absorption ability.

Type: Article
Title: Finite element modeling for the progressive collapse analysis of steel stiffened-plate structures in fires
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.tws.2020.107262
Publisher version: https://doi.org/10.1016/j.tws.2020.107262
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Bio-inspired structure, Honeycomb structure, Laser powder bed fusion, Compressive behaviors, Energy absorption, Finite element simulation
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/10114812
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