Distortional Buckling Analysis of I-Steel Concrete Composite Beams Subjected to Hogging Moment

다국어 초록 (Multilingual Abstract)

Bending-torsional distortion buckling is one of the most critical buckling modes of steel–concrete composite beams when they are working under hogging moment. The rotational and lateral restraint stiff ness provided by the steel web to the steel bottom fl ange are the key factors to determine this form of buckling. Firstly, the formula for solving the elastic rotational restraint stiff ness of the composite fl ange of steel beam upper fl ange and concrete slab to the steel web is derived. Then, the equivalent lateral and rotational restraint stiff ness of the steel bottom fl ange subjected to hogging moment are thoroughly studied. Considering the rotation restraint eff ect of the composite fl ange, this paper provides the calculation formula for the critical bending moment of I-steel concrete composite beams (I-SCCB) under hogging moment. Fifteen examples are considered to calculate the critical bending moment of the I-SCCB under hogging moment with the simplifi ed analytical method introduced in this paper. The results are compared with the ones derived by ANSYS numerical analyses and relevant research of other scholars. The infl uence of the arrangement of the shear studs on the critical bending moment of the I-SCCB is investigated. It is concluded that the results given by the simplifi ed analytical method are in good agreement with the ones obtained by the ANSYS fi nite element numerical method. Both methods show that the critical load of the distortional buckling of the I-SCCB under hogging moment is less aff ected by the member’s length. The critical bending moment of distortional buckling of the I-SCCB signifi cantly increases with the presence of shear studs. However, once shear studs are used, it tends to be stable with the increase of equivalent restrained torsional rotational stiff ness at the top edge of the steel web.

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