Abstract
The aim of this paper is to investigate the bolted end-plate beam to column (BEBC) joints with different strengthening strategies under fire through a parametric study by using a validated computational model. The current studies are mainly more focused on the mechanical behavior of a certain kind of reinforced or unreinforced BEBC joints at either room or fire alone, limiting investigations are available for a comprehensive stiffening strategy study of the BEBC joints under fire. Therefore, there is a need in improving the performance of BEBC joints with different stiffening strategies, the fire resistance comparison of these BEBC joints with different strengthening strategies under fire is of great interest. The analyses of the fire resistance behavior of the stiffened or unstiffened BEBC joints under fire were conducted by using a developed model that was established and validated by using the existing test results. A parametric study was conducted for BEBC joints with web stiffeners, end-plate stiffeners and web and end-plate stiffeners together under fire using the validated computational model. In order to better compare the fire resistance of BEBC joints with different strengthening strategies under a fire, 24 finite element models were established by considering different strengthening strategies and end-plate thicknesses. The results on different strengthening strategies and the end-plate thicknesses revealed the major impact of web stiffeners and end-plate web stiffener together, and the sensitivities of end-plate thickness for unreinforced BEBC joints. For the fire resistance of unreinforced and stiffened BEBC joints, the findings herein can provide a valuable reference for potential design recommendations.
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