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        A Numerical Investigation on Restrained High Strength Q460 Steel Beams Including Creep Eff ect

        Wei-Yong Wang,Linbo Zhang,Pingzhao He 한국강구조학회 2018 International Journal of Steel Structures Vol.18 No.5

        Most of previous studies on fi re resistance of restrained steel beams neglected creep eff ect due to lack of suitable creep model. This paper presents a fi nite element model (FEM) for accessing the fi re resistance of restrained high strength Q460 steel beams by taking high temperature Norton creep model of steel into consideration. The validation of the established model is verifi ed by comparing the axial force and defl ection of restrained beams obtained by fi nite element analysis with test results. In order to explore the creep eff ect on fi re response of restrained Q460 steel beams, the thermal axial force and defl ection of the beams are also analyzed excluding creep eff ect. Results from comparison infer that creep plays a crucial role in fi re response of restrained steel beam and neglecting the eff ect of creep may lead to unsafe design. A set of parametric studies are accomplished by using the calibrated FEM to evaluate the governed factors infl uencing fi re response of restrained Q460 steel beams. The parametric studies indicate that load level, rotational restraint stiff ness, span–depth ratio, heating rate and temperature distribution pattern are key factors in determining fi re resistance of restrained Q460 steel beam. A simplifi ed design approach to determine the moment capacity of restrained Q460 steel beams is proposed based on the parametric studies by considering creep eff ect.

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