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Development of a self-centering tension-only brace for seismic protection of frame structures

  • Chi, Pei (Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education, Southeast University) ;
  • Guo, Tong (Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education, Southeast University) ;
  • Peng, Yang (College of Civil Engineering, Nanjing Tech University) ;
  • Cao, Dafu (College of Civil Science and Engineering, Yangzhou University, 88 South University Avenue) ;
  • Dong, Jun (College of Civil Engineering, Nanjing Tech University)
  • Received : 2017.08.23
  • Accepted : 2017.12.18
  • Published : 2018.03.10

Abstract

This study develops and numerically verifies an innovative seismically resilient bracing system. The proposed self-centering 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.

Keywords

self-centering brace;tension-only brace;residual deformation;energy dissipation;pre-tension

Acknowledgement

Supported by : National Natural Science Foundation of China

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