1. Design method of ultimate bearing capacity for battened core-separated buckling-restrained members.
- Author
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ZHANG Bohao, GUO Yanlin, ZHU Boli, and HUANG Bin
- Abstract
Buckling-restrained members ( BRMs) can be classified as the buckling-prevented BRMs and the buckling- delayed BRMs. Buckling-delayed BRMs buckle before the yielding of the core, so it is more economic when it meets the bearing requirements. But most of previous studies focused on the buckling-delayed BRMs. A kind of new members named as the battened core-separated buckling-restrained member (battened CSBRM) was investigated. The effective length coefficient of a chord was obtained firstly based on the equilibrium method. Then elastic buckling loads bending about x and y axis were introduced and the buckling performance was investigated by finite element (FE) buckling analysis. Finally, based on the results of numerical analysis, an interaction formula between normalized slenderness ratio and stability factor was proposed to predict the ultimate bearing capacity. The research shows that the effective length coefficient of a chord is only related to the linear flexural rigidity ratio between a batten and a chord. The buckling mode of a specific member can be predicted by simply comparing the slenderness about two axes. Comparison with FE results show that the proposed interaction formula for calculating the ultimate resistance is effective and conservative. Furthermore, it is recommended that the critical value of normalized slenderness should be taken as 0.75. At last, design recommendations are proposed to prevent the failure of a chord before the overall failure of a battened CSBRM. The above research establishes a unified design method for both types of battened CSBRMs. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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