Bending capacity of composite girders with Class 3 section

• Published in: Journal of constructional steel research Vol. 62; no. 9; pp. 847 - 855
• Main Authors: Ryu, Hyung-Keun, Youn, Seok-Goo, Bae, Doobyong, Lee, Young-Ki
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.09.2006
• Subjects: Bending capacity; Class 3; Composite girder; Eurocode 3 and 4; Flexural behaviour; Flexural stiffness of composite section; Hogging moment; Non-monotonic load; Tension stiffening effects; Hogging moment; Non-monotonic load; Class 3; Flexural stiffness of composite section; Flexural behaviour; Tension stiffening effects; Eurocode 3 and 4; Bending capacity; Composite girder
• ISSN: 0143-974X; 1873-5983
• DOI: 10.1016/j.jcsr.2005.12.002

In this research, the flexural behaviour of composite girders under non-monotonic service loads and the bending capacity of composite girders with Class 3 section were studied through experimental work. Three specimens were fabricated and, through the 4-point flexural test, the stiffness and strength of the composite girder under hogging moments were observed. Test specimens were overhanging simple support beams, in total 6 m long. From the test results, the deflection, stiffness, moment–curvature relationship, and strain distribution of the composite girder section under service and ultimate loading were analyzed. The flexural behaviour under reloading–unloading cycles and tension stiffening effects on the mechanical behaviour of composite girders were discussed. The ultimate strength of composite girders with different Class flange sections and a same Class web section were also studied. Test results were analyzed by design equations in Eurocode 3 and 4 for flexural stiffness and sectional resistances. Also, a new simple design equation for the bending capacity of composite girders with Class 3 sections was suggested.