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Civil and Traffic Engineering     
Ductility grading of rectangular steel tube section and width thickness ratio correlation
OUYANG Dan dan1, FU Bo2,3 , TONG Gen shu3
1. Hangzhou Non Commissioned Officer Academy of CAPF, Hangzhou 310023, China; 2. Hangxiao Steel Structure Company Limited, Hangzhou 310003, China; 3. Department of Civil Engineering, Zhejiang University, Hangzhou 310058, China
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The finite element models of rectangular steel tube section were built by ANSYS software. Under combined bending and compression, the moment curvature curves of cross section were obtained by nonlinear analysis and the section ductility was defined by curvature. The effects of residual stress, initial geometric imperfection, length height ratio, plate thickness ratio and width thickness ratio on section ductility were analyzed. Relation between the slenderness and ductility factor of steel tube section was proposed. The ductility grading of sections were classified by structural behavior factors which were used to calculate seismic force. Whether over strength factor was included in the structural behavior factor was distinguished. The requirements of structure ductility and section ductility were given on all kinds of sections and the corresponding slenderness boundaries were obtained by using ductility factors formula of steel tube section. By introducing the ratio of width thickness ratio and buckling coefficient of steel tube section, slenderness boundaries were converted into the correlation of the width thickness ratio of flange and web, and the correlation formula of width thickness ratio was proposed.The results show that residual stress and initial geometric imperfection has less effect on section ductility. When the number of buckling half wave is greater than one, the effect of length height ratio can also be neglected. The interaction between flange and web has great influence on section ductility. It is necessary to adopt the form of width thickness ratio correlation to classify the ductility grading of section.

Published: 01 February 2016
CLC:  TU 391  
Cite this article:

OUYANG Dan dan, FU Bo,TONG Gen shu. Ductility grading of rectangular steel tube section and width thickness ratio correlation. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2016, 50(2): 271-281.

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