Finite Element Fracture Mechanics Study of Pre-Northridge Connections

Abstract:

The objective was to quantify the variation of stress intensity factor to weld root flaw sizes in steel frame connections. Finite-element analyses were used to study fracture toughness in welded beam-column connections. Investigations of fracture behavior mainly focused on the standard pre-Northridge connection geometry. Finite element analysis was performed using the ANSYS computer program. Stress intensity factor was calculated through a J-integral approach. Results show that stress intensity factor is not uniform and is largest in the middle of beam flange. Stress intensity factor increases nearly linear with the increase of flaw size. Backing bars have little effect on weld fractures.

• Periodical: Key Engineering Materials (Volumes 324-325)
• Pages: 1007-1010
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.324-325.1007
• Online since: November 2006
• Authors: Hong Bo Liu, Chang Hai Zhai, Yong Song Shao, Li Li Xie
• Keywords: Finite Element, Fracture Mechanic, Steel Frame, Stress Intensity Factor (SIF)

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