A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Local Buckling of Concrete-Filled Circular Steel Tubes
The use of concrete-filled steel tubes of circular cross-section (CFST's), as composite columns in high-rise office and residential construction is now commonplace. Significant economies may be gained when the steel tube is thin-walled, with diameter to thickness ratios exceeding 100. Current design of these members is based on limiting the diameter to thickness ratio to ensure that local buckling does not take place, but the specification of such a limit does not appear to have a sound basis derived from the application of engineering mechanics. Furthermore, with an accurately-determined limit, if local buckling does indeed occur then it is necessary to be able to predict the strength of the locally-buckled tube. This paper presents a Ritz-based procedure for deriving the elastic local buckling stress for the steel component of a CFST. The local buckling stress is then used in a calibration procedure for determining both the limiting depth to thickness ratio that delineates a fully-effective and slender section, that incorporates the effects of initial geometric imperfections and residual stresses.
Local Buckling of Concrete-Filled Circular Steel Tubes
The use of concrete-filled steel tubes of circular cross-section (CFST's), as composite columns in high-rise office and residential construction is now commonplace. Significant economies may be gained when the steel tube is thin-walled, with diameter to thickness ratios exceeding 100. Current design of these members is based on limiting the diameter to thickness ratio to ensure that local buckling does not take place, but the specification of such a limit does not appear to have a sound basis derived from the application of engineering mechanics. Furthermore, with an accurately-determined limit, if local buckling does indeed occur then it is necessary to be able to predict the strength of the locally-buckled tube. This paper presents a Ritz-based procedure for deriving the elastic local buckling stress for the steel component of a CFST. The local buckling stress is then used in a calibration procedure for determining both the limiting depth to thickness ratio that delineates a fully-effective and slender section, that incorporates the effects of initial geometric imperfections and residual stresses.
Local Buckling of Concrete-Filled Circular Steel Tubes
Bradford, Mark A. (author) / Loh, Hing Yip (author) / Uy, Brian (author)
Composite Construction in Steel and Concrete IV Conference 2000 ; 2000 ; Banff, Alberta, Canada
2002-05-22
Conference paper
Electronic Resource
English
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