HSB 고성능 강재를 적용한 강합성 I-거더 정모멘트에 대한 휨저항강도 및 연성비

초록

In this study, flexural strength and ductility requirements of composite hybrid steel I-girder with its HSB(highperformance steel for bridge) applied to tension flanges are examined in positive bending. In AASHTO LRFD specification,flexural strength and ductility requirements of composite I-girder in positive bending are specified in terms of plastic momentand plastic neutral axis that are derived from plastic behavior of conventional steel. However, plastic zone cannot be definedclearly from the stress-strain behavior of HSB unlike the behavior of conventional steel. Therefore, through idealizedstress-strain curves of HSB, the plastic moment of composite hybrid steel I-girder with its HSB applied to tension flanges isdefined by assuming the plastic zone of HSB. By using the consequences of numerical analysis regarding arbitrary cross-sectionsthat have various dimensions, ductility requirements and flexural strength of composite hybrid I-girder with its HSB applied totension flange are proposed.

키워드