Brazier Effect of Thin Angle-Section Beams under Bending

Zhiguang Zhou, Liuyun Xu, Chaoxin Sun and Songtao Xue
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Zhiguang Zhou: Research Institute of Structural Engineering and Disaster Reduction, Tongji University, Shanghai 200092, China
Liuyun Xu: Research Institute of Structural Engineering and Disaster Reduction, Tongji University, Shanghai 200092, China
Chaoxin Sun: General Contracting Department, Shanghai Construction Group, Shanghai 200036, China
Songtao Xue: Research Institute of Structural Engineering and Disaster Reduction, Tongji University, Shanghai 200092, China

Sustainability, 2018, vol. 10, issue 9, 1-11

Abstract: Thin-walled section beams have Brazier effect to exhibit a nonlinear response to bending moments, which is a geometric nonlinearity problem and different from eigenvalue problem. This paper is aimed at investigating the Brazier effect in thin-walled angle-section beams subjected to pure bending about its weak axis. The derivation using energy method is presented to predict the maximum bending moment and section deformation. Both numerical analyses and experimental results were used to show the validity of the proposed formula. Numerical results show that the boundary condition can influence the results due to the end effect, and that the influence tends to be negligible when the length of angle beam goes up to 30 times as the length of beam side. When the collapse in experiments is governed by Brazier flattening, the moment vs. curvature curve deviates significantly from the linear beam theory, but coincides well with the proposed formula in consideration of the restraint due to limited span of experimental setup. It can be concluded that the proposed formula shows good agreement with numerical results and experimental results.

Keywords: Brazier effect; angle section; Brazier flattening; variational method; numerical simulation; beam (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2018
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