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Title: Structural Behavior of CHS T-Joints Subjected to Static In-Plane Bending in Fire Conditions
Authors: Fung, Tat Ching
Tan, K. H.
Nguyen, Minh Phuong
Keywords: Ultimate strength
Experimental study
In-plane bending
Finite-element model
Structural safety and reliability
Circular hollow section
Issue Date: 2015
Source: Fung, T. C., Tan, K. H., & Nguyen, M. P. (2015). Structural Behavior of CHS T-Joints Subjected to Static In-Plane Bending in Fire Conditions. Journal of Structural Engineering, 142(3), 1-13.
Series/Report no.: Journal of Structural Engineering
Abstract: Fire resistance of steel joints is always a major concern in the designing of steel structures against extreme hazard. However, for Circular Hollow Section (CHS) joints in fire condition, little information is available, especially for T-joints. In order to get more insight into the static behaviour of CHS T-joint in elevated temperatures, experimental and numerical studies were conducted on selected T-joints subject to in-plane bending under elevated temperatures. The failure modes and ultimate strength of the joints subjected to different temperatures were investigated and compared to the corresponding joint at ambient condition. Within the range of investigated parameters, elevated temperature at 700oC was observed to reduce the joint strength to 22.1% compared to the corresponding joint at ambient temperature. Furthermore, it is observed that at high temperature, there was a change in the failure mode of the joints. Cracks formed around the center weld toes before the joints reached excessive deformation which subsequently affected the joint post-yield hardening performance. In order to understand the initiation of the cracks, a material test was performed. The fracture strains of the HAZ of the chord material beneath center weld at corresponding temperatures were determined. It is noted that the fracture strains were included in subsequent FE validation models. The verified FEA models were used to analyze the structural behaviour of CHS T-joints at elevated temperature such as strain, stress, load path and effect of fracture strains to gain an insight into the failure mechanism of the joints.
ISSN: 0733-9445
DOI: 10.1061/(ASCE)ST.1943-541X.0001382
Schools: School of Civil and Environmental Engineering 
Rights: © 2015 American Society of Civil Engineers (ASCE). This is the author created version of a work that has been peer reviewed and accepted for publication by Journal of Structural Engineering, American Society of Civil Engineers (ASCE). It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [].
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:CEE Journal Articles

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