Theoretical and numerical study on an innovative self-centering energy-dissipative tension-brace system

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Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (21) : 171-176.

CHI Pei1, DONG Jun1, PENG Yang1, LIEW J. Y. Richard1,2

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Abstract

Conventional braced frame system which dissipates seismic energy by yielding mechanism would incur large permanent deformations after major earthquakes. Such permanent deformations could affect the structural safety and it is often costly to repair. To address this drawback, a novel tension-brace system capable of self-centering and energy dissipation is proposed. For a given seismic intensity, the proposed system is capable of reducing its stiffness in order to dissipate energy and provide a restoring force to reduce the permanent deformations. The key concept and the mechanics of the self-centering tension-brace system are presented. An analytical model has been developed to determine the load-displacement relationships under monotonic and cyclic loads. The performance of the tension-brace system is further investigated by using nonlinear finite element software ABAQUS. The analysis results show that the tension-brace system can achieve the function of self-centering upon which the storey drift exceeds 2.0%. Both the analytical and numerical models provide the necessary tools to establish design guide for designing the proposed self-centering energy-dissipative tension-brace system.

Key words

seismic performance / self-centering / energy-dissipation / bracing / prestress

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CHI Pei1, DONG Jun1, PENG Yang1, LIEW J. Y. Richard1,2. Theoretical and numerical study on an innovative self-centering energy-dissipative tension-brace system[J]. Journal of Vibration and Shock, 2016, 35(21): 171-176

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