doi:10.3850/978-981-08-9247-0_rp009-icsas11
Finite Element Analysis of Cold-Formed Stainless Steel Tubular T-Joints at Elevated Temperatures
R. Feng and B. Young
Department of Civil Engineering, The University of Hong Kong, Hong Kong
ABSTRACT
This paper describes the numerical investigation of cold-formed stainless steel tubular T-joints
at elevated temperatures. The tubular T-joints were welded from cold-formed square and
rectangular hollow sections as brace and chord members. The material properties of high
strength stainless steel (duplex and high strength austenitic) and normal strength stainless
steel (AISI 304) at elevated temperatures were carefully incorporated in the finite element
model. An extensive numerical study of 180 specimens consists of 20 T-joints at different
temperatures ranged from 22 to 870°C was conducted. The numerical results were compared
with the design strengths calculated from the current design rules for stainless steel tubular
T-joints at normal room temperature (ambient temperature) by using the material properties of
stainless steel tubes at elevated temperatures. In the calculation of the joint strengths, the
reduced material property of 0.2% proof stress was used due to the deterioration of material at
elevated temperatures. Furthermore, design rules for cold-formed stainless steel tubular
T-joints are proposed by introducing a temperature factor (ξT). A reliability analysis was
performed to assess the current and proposed design equations.
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