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Flexural Strength of Composite HSB 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. 389-398 More about this Journal
Abstract
The flexural strength of composite HSB I-girders under a positive moment was investigated using the moment-curvature analysis method to evaluate the applicability of the current AASHTO LRFD design specifications to such girders. A total of 2,391 composite I-girder sections that satisfied the section proportion limits of the AASHTO LRFD specifications was generated by the random sampling technique to consider a wide range of section properties. The flexural capacities of the sections were calculated inthe nonlinear moment-curvature analysis in which the HSB600 and HSB800 steels were modeled as an elasto-plastic strain-hardening material, and the concrete, as a CEB-FIP model. The effects of the ductility ratio and the compressive strength of the concrete slab on the flexural strength of the composite girders made of HSB and SM520-TMC steels were analyzed. The numerical results indicated that the current AASHTO LRFD equation can be used to calculate the flexural strength of composite girders made of HSB600 steel. In contrast, the current AASHTO LRFD equation was found to be non-conservative in its prediction of the flexural strength of composite HSB800 girders. Based on the numerical results of this study for 2,391 girders, a new design equation for the flexural strength of composite HSB800 girders in a positive moment was proposed.
Keywords
high strength steel; positive moment; flexural strength; ductility ratio; nonlinear analysis;
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Times Cited By KSCI : 1  (Citation Analysis)
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