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- 저자 : Jiting Qu (검색결과 1 건)
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Lihua Huang,Wenbin Yang,Tingwei Shi,Jiting Qu 한국강구조학회 2021 International Journal of Steel Structures Vol.21 No.1
In this paper, a series of axial compression tests were conducted on lipped channel columns constructed from cold-formed high strength Grade G550 steel sheet of thickness of 1 mm in order to investigate the local and distortional interaction buckling performance. The failure modes, ultimate loads and load–displacement curves of the specimens were reported and analyzed. The experiment revealed the deformation mechanism of specimens failing in local-distortional interaction or distortional mode. Besides, a fi nite element model was developed to predict the buckling performance of the specimens. The eff ect of diff erent imperfection shapes and material models on numerical results was investigated so that the reasonable fi nite element analysis can be carried out. It was found that the local buckling mode with an odd number of waves as the initial imperfection can produce practical deformation process. Meanwhile, the material model of Ramberg–Osgood can be applied for the nonlinear fi nite element analysis of the specimens. The parametric analysis was also performed to study the relationship between the sensitivity of specimens to local and distortional imperfections as well as the variation of bearing capacity with the geometric size. It was found that the lip width has great infl uence on the bearing capacity of specimens because of the signifi cant restriction of lip on distortional deformation.
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