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- 저자 : Wang Xiaxin (검색결과 2 건)
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Study on Ultimate Capacity of Steel H-Section Members Under Combined Biaxial Bending and Axial Force
Cheng Xin,Wang Xiaxin,Zhang Chao,Duan Dexin 한국강구조학회 2021 International Journal of Steel Structures Vol.21 No.5
The ultimate resistance of steel H-section members under biaxial bending and compression has been discussed in the present paper. Finite element models taking account of geometrical and material nonlinearities are established and validated by previous laboratory test results. A series of parametric studies are then conducted considering diff erent loading angles and a spectrum of fl ange width-to-thickness ratios, web width-to-thickness ratios and axial force ratios. An improved energy infl ection method (EIM), which is verifi ed by comparing the analytical results with numerical results, is proposed in order to determine the ultimate state of the members under biaxial bending. It is shown that the ultimate state determined by EIM occurs when the sectional stress distribution reaches the envelop line. Finally, a simple interaction formula is proposed to predict the ultimate capacity of the steel H-section columns subjected to biaxial bending and compression. It is verifi ed that the interaction formula can provide a satisfactory prediction, in comparison against the European code which tends to off er a relatively conservative estimate. The proposed method is applicable to fl ange width-to-thickness ratios ranging from 8 to 28, web width-to-thickness ratios changing from 30 to 120, and axial force ratios varying from 0 to 0.4.
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Ultimate Behavior and Design of Cold-Formed Steel Square Hollow Section Members
Xiaopeng Shi,Xin Cheng,Xiaxin Wang,Mohamad Mansour 한국강구조학회 2022 International Journal of Steel Structures Vol.22 No.3
The ultimate behavior and design of cold-formed steel square hollow section (SHS) members are investigated in the present study, with the focus on their local buckling behavior under pure compression and pure bending, as well as combinations of compression and bending. Finite element (FE) models are established and validated against existing experimental data collected from the literatures; the FE models take into account the initial local imperfections, geometric and material nonlinearities, and cold-formed eff ect. Following the validation, the FE models are utilized to perform a series of parametric studies, considering diff erent cross-section width-to-thickness ratios and loading cases. The stress distributions within the critical cross-section of the SHS members under diff erent loading conditions are investigated and an eff ective plastic width method (EPM) is proposed for the determination of the ultimate resistance of SHS in compression and bending. The numerically obtained results are used to assess the accuracy of the existing design rules stipulated in the Chinese and European design codes and the proposed EPM. It is shown that the proposed EPM is able to provide more accurate design predictions in relative to the codifi ed design approaches, owing largely to its rational considerations of the strain hardening, cold-formed eff ect and partial plasticity of the cold-formed SHS members.
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