Techno Press

Steel and Composite Structures   Volume 26, Number 5, March10 2018, pages 573-582
Development of a self-centering tension-only brace for seismic protection of frame structures
Pei Chi, Tong Guo, Yang Peng, Dafu Cao and Jun Dong

Abstract     [Full Text]
    This study develops and numerically verifies an innovative seismically resilient bracing system. The proposed selfcentering tension-only brace (SC-TOB) is composed of a tensioning system to provide a self-centering response, a frictional device for energy dissipation, and a high-strength steel cable as a bracing element. It is considered to be an improvement over the traditional self-centering braces in terms of lightness, high bearing capacity, load relief, and double-elongation capacity. In this paper, the mechanics of the system are first described. Governing equations deduced from the developed analytical model to predict the behavior of the system are then provided. The results from a finite element validation confirm that the SC-TOB performs as analytically predicted. Key parameters including the activation displacement and load, the self-centering parameter, and equivalent viscous damping are investigated, and their influences on the system behavior are discussed. Finally, a design procedure considering controlled softening behavior is developed and illustrated through a design example.
Key Words
    self-centering brace; tension-only brace; residual deformation; energy dissipation; pre-tension
(1) Pei Chi, Tong Guo:
College of Civil Engineering, Nanjing Tech University, 30 South Puzhu Road, Nanjing 211816, China;
(2) Pei Chi, Dafu Cao:
College of Civil Science and Engineering, Yangzhou University, 88 South University Avenue, Yangzhou 225009, China;
(3) Yang Peng, Jun Dong:
College of Civil Engineering, Nanjing Tech University, 30 South Puzhu Road, Nanjing 211816, China.

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