Development and Testing of Naturally Buckling Steel Braces
Publication: Journal of Structural Engineering
Volume 142, Issue 1
Abstract
Steel concentrically braced frames inherently provide great strength and stiffness, and are widely used for seismic resisting systems in buildings. These include conventional buckling braced frames and buckling restrained braced frames. Although the latter can prevent brace buckling and provide ductile behavior, both types of braces provide no hysteretic damping at small drift levels and offer very limited post-yielding stiffness. This study proposes a new type of steel brace with a novel mechanism—the naturally buckling brace (NBB). The design combines high-strength and low-yield steels arranged in parallel with a specified initial eccentricity along the brace length, providing ductile seismic behavior. Six tests of various NBB models subjected to cyclic loading were conducted to examine the seismic performance of the proposed NBB. Two specimens out of the six achieved the characteristics intended for NBB. The test results showed that the NBB specimens with appropriate design parameters could achieve early yielding, or hysteretic damping, from around 0.11% story drift and prevent local buckling as well as deformation concentration up to a very large story drift (greater than 3%). A single NBB would provide an asymmetric hysteretic behavior, a large post-yielding stiffness in tension, and a ductile performance with stable energy dissipation. Further systematic studies of NBBs are needed to comprehensively evaluate the capacities and limitations of the NBBs, including the reliability of performance with repeated tests.
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References
Black, C., Makris, N., and Aiken, I. (2002). “Component testing, stability analysis and characterization of buckling-restrained unbonded braces (TM).” Earthquake Engineering Research Center, Univ. of California, Berkeley, CA.
Black, G. R., Wenger, B. A., and Popov, E. P. (1980). “Inelastic buckling of steel struts under cyclic load reversals.”, Earthquake Engineering Research Center, Univ. of California, Berkeley, CA.
Christopoulos, C., and Montgomery, M. (2013). “Viscoelastic coupling dampers (VCDs) for enhanced wind and seismic performance of high-rise buildings.” Earthquake Eng. Struct. Dyn., 42(15), 2217–2233.
Hsiao, P. C., Lehman, D. E., and Roeder, C. W. (2013). “A model to simulate special concentrically braced frames beyond brace fracture.” Earthquake Eng. Struct. Dyn., 42(2), 183–200.
Jacobsen, L. S. (1960). “Damping in composite structures.” Proc., 2nd World Conf. on Earthquake Engineering, Vol. 2, Science Council of Japan, Tokyo, 1029–1044.
Lehman, D. E., and Roeder, C. W. (2008). “Improved seismic design of concentrically braced frames and gusset plate connections.” Proc., Structures Congress 2008, ASCE, Reston, VA, 1–10.
Nakashima, M. (1995). “Strain-hardening behavior of shear panels made of low-yield steel. I: Test.” J. Struct. Eng., 1742–1749.
Popov, E. P., Takanashi, K., and Roeder, C. W. (1976). “Structural steel bracing systems.”, Univ. of California, Berkeley, CA.
Sarlis, A., Pasala, D., Constantinou, M., Reinhorn, A., Nagarajaiah, S., and Taylor, D. (2013). “Negative stiffness device for seismic protection of structures.” J. Struct. Eng., 1124–1133.
Tremblay, R., Archambault, M.-H., and Filiatrault, A. (2003). “Seismic response of concentrically braced steel frames made with rectangular hollow bracing members.” J. Struct. Eng., 1626–1636.
Tsai, K. C., et al. (2008). “Pseudo-dynamic tests of a full-scale CFT/BRBF frame. Part 1: Specimen design, experiment and analysis.” Earthquake Eng. Struct. Dyn., 37(7), 1081–1098.
Viti, S., Cimellaro, G. P., and Reinhorn, A. M. (2006). “Retrofit of a hospital through strength reduction and enhanced damping.” Smart Struct. Syst., 2(4), 339–355.
Watanabe, A., Hitomi, Y., Saeki, E., Wada, A., and Fujimoto, M. (1988). “Properties of brace encased in buckling-restraining concrete and steel tube.” Proc., 9th World Conf. on Earthquake Engineering, Japan Association for Earthquake Disaster Prevention, Tokyo, 719–724.
Ye, L. P., et al. (2008). “Study on the influence of post-yielding stiffness to the seismic response of building structures.” Proc., 14th World Conf. on Earthquake Engineering, China Earthquake Administration Ministry of Construction, Beijing.
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© 2015 American Society of Civil Engineers.
History
Received: May 25, 2014
Accepted: Mar 11, 2015
Published online: Jun 9, 2015
Discussion open until: Nov 9, 2015
Published in print: Jan 1, 2016
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