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Overall Stability Analysis of“上”-section Steel Girder Under Combined Bending and Torsion(PDF)


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Overall Stability Analysis of“上”-section Steel Girder Under Combined Bending and Torsion
LIU Jiang LIU Yong-jian FANG Jian-hong PENG Yuan-cheng
School of Highway, Chang’an University
bridge engineering “上”-section steel girder overall stability overall stability coefficient ratio of eccentricity and span
In order to analyze the overall stability of “上”-section steel girder under combined bending and torsion, finite element method was used and L/1 000 (L?was span) geometric imperfection was considered by buckling mode. Compared with experiment data of existing literature, the veracity was verified. On the basis above, stability of “上”-section steel girder under concentrated load on midspan and uniform load on full span were respectively analyzed. A formula of “上”-section steel girder overall stability coefficient was proposed by curve fitting, and the effects of load eccentricity and span on stability bearing capacity and proportion of bending and torsion were also analyzed. The study results indicate that stability bearing capacity can be accurately calculated by considering L/1 000 geometric imperfection through buckling mode. Overall stability coefficient of “上”-section steel girder was less than I-girder specified in China’s code for design of steel structures, which under uniform load is less than concentrated load. Stability bearing capacity of “上”-section steel girder reduces as the increasing of load eccentricity and span, and the degree of influence also reduces as well. Buckling failure is induced mainly by torsional effect in the large ratio of eccentricity and span, and is induced mainly by bending effect in the small ratio of eccentricity and span. It will be unsafe using Technical Code of Cold-formed Thin-wall Steel Structures (GB 50018—2002) to check the overall stability of “上”-section steel girder.



Last Update: 2017-09-11