Dynamic Response of a Chevron Concentrically Braced Frame
Publication: Journal of Structural Engineering
Volume 139, Issue 4
Abstract
Large-scale shake table tests were conducted at E-Defense, Japan, to examine the dynamic response of a steel concentrically braced frame. The specimen was a single-bay, single-story frame with a pair of square hollow structural section braces placed in a chevron arrangement. The gusset plates connecting the brace to the framing elements were provided with an elliptic fold line to accommodate out-of-plane rotation of the brace in compression. The specimen was subjected repeatedly to a unidirectional ground motion with increasing magnitude until the braces buckled and eventually fractured. The bracing connections performed as intended; the gusset plates folded out of plane, and no crack was observed in the gusset plate or in the critical welds. Consequently, the test results demonstrated excellent performance of the bracing connections. Elastic deformation of the beam prevented the braces from developing their full tensile strength. Yielding in the middle of the beam, which was predicted by monotonic loading analysis, did not occur. The specimen response was reproduced by a numerical model using fiber elements. This model was able to predict the occurrence of brace buckling and fracture and thereby accurately trace the dynamic behavior of the frame.
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Acknowledgments
This project was funded by the National Research Institute for Earth Science and Disaster Prevention of Japan. Ms. Sachi Furukawa, Mr. Ryo Umehara, and Mr. Xuchuan Lin helped process the data. The authors thank the administrative and technical staff at E-Defense, officially named the Hyogo Earthquake Engineering Research Center. Mr. Chui-Hsin Chen and Professor Steve Mahin at the University of California (Berkeley, CA) kindly shared information on their numerical models. The opinions expressed in this paper are those of the authors and do not necessarily reflect the views of the individuals and organizations mentioned herein.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 139 • Issue 4 • April 2013
Pages: 515 - 525
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Dec 28, 2011
Accepted: Jul 20, 2012
Published online: Aug 11, 2012
Published in print: Apr 1, 2013
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