Flexural Demand on Pin-Connected Buckling-Restrained Braces and Design Recommendations
Publication: Journal of Structural Engineering
Volume 138, Issue 11
Abstract
In a previous study by the authors, the cyclic behavior of a novel type of pin-connected angle steel buckling-restrained brace (ABRB) was examined, and the failure mechanism in the core projection of the ABRB induced by an excessive bending effect caused by end rotation was discussed. In this paper, the occurrence mechanism of end rotation modes and the bending effect in the core projection of an ABRB are first investigated based on the previous test results, which shows that end rotation demands would be significantly increased with the presence of a gap and an additional bending effect could be observed if the end rotation demands were large enough to cause two-point contact at the core ends. Then, a new method to predict the flexural demand on pin-connected BRBs is proposed by considering the effect of the end rotation modes, clearance, initial eccentricity, and initial deflection of casing. The design criteria to prevent yielding of the core projection are presented and further verified by the previous test results. Furthermore, the effects of key influential parameters on the flexural demand on core projection are discussed based on the analytical results. It is found that such a bending effect can be significantly reduced by decreasing the gap or increasing the constrained length of the core stiffening segment. The C-mode end rotation with single curvature bending configuration is found to be generally the most unfavorable case for core projection design. Finally, several design recommendations are provided for pin-connected BRBs.
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Acknowledgments
This project was funded by the National Basic Research Program of China (973 Program) under Grant No. 2007CB714204, the National Key Technology R&D Program under Grant Nos. 2006BAJ03B06-01 and 2006BAJ06B03-03, and the National Science Foundation of China under Grant No. 51161120360.
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© 2012 American Society of Civil Engineers.
History
Received: Dec 5, 2010
Accepted: Dec 8, 2011
Published online: Dec 19, 2011
Published in print: Nov 1, 2012
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