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中南大学学报(英文版)

Journal of Central South University

Vol. 28    No. 8    August 2021

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Behavior of double K-BRB braces under lateral loading
Ali GHAMARI1, Hadi HAERI2, Amir JOHARI NAEIMI3, Zohreh NAJMI4, Vahab SARFARAZI5

1. Department of Civil Engineering, Darreh Shahr Branch, Islamic Azad University, Darreh Shahr, Iran;
2. State Key Laboratory for Deep GeoMechanics and Underground Engineering, Beijing 100083, China;
3. Department of Civil Engineering, Amirkabir University of Technology, Tehran, Iran;
4. Department of Structural Engineering, Aria University of Science and Sustainability, Tehran, Iran;
5. Department of Mining Engineering, Hamedan University of Technology, Hamedan, Iran

Abstract:The buckling resisting brace (BRB) is an efficient system against lateral loads that enjoy high seismic energy absorption capacity. Although desirable behavior of BRBs has been confirmed, the stiffness of the system is not desirable that it can be compensated by changing the configuration of BRB braces. In so doing, the configuration in the form of double K (DK) is investigated to achieve more favorable behavior. Also, the required mathematical formulas were proposed to design the system. Comparison of DK system with other conventional BRB showed that the DK system has a better structural performance and is more economical (due to needing less core area) than other conventional BRB. Numerical results indicated that the DK system increases the lateral ultimate strength, lateral nonlinear stiffness, and energy absorption. Besides, the DK configuration reduces the axial forces created in columns in the nonlinear zone. Reducing material demand, created forces in the main frame, and also increasing of nonlinear stiffens by DK improve the structure’s safety.

 

Key words: buckling resisting brace (BRB); stiffness; ultimate strength; ductility; brace; energy absorption

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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