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Flexural Strength of Composite HSB Hybrid Girders in Positive Moment  

Cho, Eun-Young (명지대학교 토목환경공학과)
Shin, Dong-Ku (명지대학교 토목환경공학과)
Publication Information
Journal of Korean Society of Steel Construction / v.23, no.3, 2011 , pp. 385-395 More about this Journal
Abstract
The flexural strength of composite HSB hybrid I-girders under positive moment is investigated by the moment-curvature analysis method to evaluate the applicability of the current AASHTO LRFD design specification to such girders. The hybrid girders are assumed to have the top flange and the web fabricated from HSB600 steel and the bottom flange made of HSB800 steel. More than 6,200-composite I-girder sections that satisfy the section proportion limits of AASHTOL RFD specifications are generatedby the random sampling technique to consider a statistically meaningful wide range of section properties. The flexural capacities of the sections are calculated by the nonlinear moment-curvature analysis in which the HSB600 and HSB800 steels are modeled as an elastoplastic, strain-hardening material and the concrete as CEB-FIP model. The effects of ductility ratio and compressive strength of concrete slab on the flexural strength of composite hybrid girders make of HSB steels are analyzed. Numerical results indicated that the current AASHTO-LRFD equation can be used to calculate the flexural strength of composite hybrid girders fabricated from HSB steel.
Keywords
hybrid girder; high strength steel; positive moment; flexural strength; nonlinear analysis;
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Times Cited By KSCI : 2  (Citation Analysis)
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