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DSM Design of Cold-Formed Steel Columns Failing in Distortional Modes at Elevated Temperatures
Alexandre Landesmann,Dinar Camotim,Fernanda C. M. Silva 한국강구조학회 2019 International Journal of Steel Structures Vol.19 No.3
This paper aims at investigating the structural behaviour, strength and Direct Strength Method (DSM) design of cold-formed steel columns failing in distortional modes at elevated temperatures. The results concern pin-ended and fi xed-ended columns displaying four cross-section shapes, with various dimensions, subjected to 8 temperatures. It is shown that the current DSM distortional design is unable to handle adequately distortional failures at elevated temperatures. Then, a modifi ed DSM design approach is proposed: it consists of incorporating a temperature-dependent reduction factor ratio, based on the EC3- 1.2 model, in the existing strength curve—the modifi ed design curves are shown to yield adequate failure load predictions for the set of columns under consideration. This fi nding provides motivation and encouragement to continue the ongoing search for an effi cient DSM-based design approach for columns failing in distortional modes under elevated temperatures.
Steel-concrete composite bridge analysis using generalised beam theory
Rodrigo Gonalves,Dinar Camotim 국제구조공학회 2010 Steel and Composite Structures, An International J Vol.10 No.3
This paper reports recent developments concerning the application of Generalised Beam Theory (GBT) to the structural analysis of steel-concrete composite bridges. The potential of GBT-based semi-analytical or finite element-based analyses in this field is illustrated/demonstrated by showing that both accurate and computationally efficient solutions may be achieved for a wide range of structural problems, namely those associated with the bridge (i) linear (first-order) static, (ii) vibration and (iii) lateral-torsional-distortional buckling behaviours. Several illustrative examples are presented, which concern bridges with two distinct cross-sections: (i) twin box girder and (ii) twin I-girder. Allowance is also made for the presence of discrete box diaphragms and both shear lag and shear connection flexibility effects.