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- 저자 : Lunhua Bai (검색결과 1 건)
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Experimental and Numerical Study on Buckling Behavior of a Rigidly Stiff ened Plate with Tee Ribs
Lunhua Bai,Ruili Shen,Lu Wang,Yuan Wang,Rusong Miao 한국강구조학회 2018 International Journal of Steel Structures Vol.18 No.2
In the bridge structures, stiff ened plates are usually designed as rigidly stiff ened when the orthotropic steel box girder is used as the main load-bearing structure. Therefore, the buckling mode of stiff ened plates is plate buckling which occurs in subpanel supported by stiff eners. The orthotropic steel box girder is used as the main girder for Egongyan Rail Special Bridge, which is a self-anchored suspension bridge. Plates of the steel girder are rigidly stiff ened with unequal spacing open ribs, and the most slender stiff ened plate is the mid web stiff ened with Tee ribs. In order to ensure the safety of the bridge, the buckling behavior of the web and orthotropic steel box girder under axial compression, including ultimate strength, post-buckling behavior and failure modes, should be clearly investigated by experimental and numerical methods. The design, loading and testing methods of the 1:4 scale model of the orthotropic steel box girder are introduced in detail fi rstly. The orthotropic steel box girder and the stiff ened web fi nite element (FE) models are validated by the test results, and the eff ects of residual stress and the magnitude of geometric imperfections are discussed roughly. Based on the validated web FE model, a detailed parametric study is performed to systematically investigate the eff ects of residual stress and geometric imperfections on buckling behavior of the web. The eff ect of shapes of geometric imperfections discussed is highlighted. Through tracing stress states, the failure modes of stiff ened plate are in agreement with the experimental phenomenon to some extent. Results show that shapes of geometric imperfections have signifi cantly infl uenced post-buckling behavior and failure modes of the web, but slightly aff ected the ultimate strength. It is advised that residual stress and geometric imperfections should be controlled to make full use of excellent performance of steel materials.
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