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Flexural Behavior of Composite HSB I-Girders in Positive Moment  

Cho, Eun-Young (명지대학교 토목환경공학과)
Shin, Dong-Ku (명지대학교 토목환경공학과)
Publication Information
Journal of Korean Society of Steel Construction / v.22, no.4, 2010 , pp. 377-388 More about this Journal
Abstract
The flexural behavior of composite HSB600 and HSB800 I-girders under a positive moment was investigated using the material non-linear moment-curvature analysis method. Three representative composite sections with different ductility properties were selected as the baseline sections in this study. Using these baseline sections, the moment-curvature program was verified by comparing the flexural strength and the moment-curvature curve obtained from the program with those obtained using the non-linear FE analysis of ABAQUS. In the FE analysis, the composite girders were modeled three-dimensionally with flanges, the web, and the concrete slab as thin shell elements, and initial imperfections and residual stresses were imposed on the FE model. In the moment-curvature and FE analyses, the 28-day compressive strength of the concrete slab was assumed to be 30-50 MPa, and the HSB600 and HSB800 steels were modeled as elasto-plastic strain-hardening materials, with the concrete as the CEB-FIP model. The effects of the ductility ratio of the composite girder, the type of steel, the compressive strength of the concrete deck, and the location of the plastic neutral axis on the flexural characteristics were analyzed.
Keywords
HSB; composite girder; positive moment; flexural behavior; moment-curvature analysis;
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