1. The 5th Tongji-UBC Symposium on Earthquake Engineering
“Facing Earthquake Challenges Together” May , Tongji University, Shanghai, China
Performance Assessment of Buckling Restrained Knee Braced Truss Moment Frame (BRKBTMF) System
Yuanjie Li
MASc | The University of British Columbia, Canada
Supervised by Tony Yang, Ph.D.

2. Introduction Resilient long-span seismic system
Long-span truss
Buckling restrained brace (BRB)

3. Buckling restrained knee braced truss moment frame (BRKBTMF)
Univ. of Michigan
IIT, Kanpur
King Mongkut’s Univ. of Tech.

4. Design procedure
Performance-based plastic design procedure

5. Seismic performance evaluation
Prototype building
30 ft.
45 ft.
60 ft.
Plan view

6. Prototype building
30 ft.
45 ft.
60 ft.
BRKBTMF
Moment frame (MF)

7. Seismic performance evaluation
Initial cost comparison MF
BRKBTMF

8. Seismic performance evaluation
Ground motion and experimental calibration
(a) Target spectra for three hazard
(b) Ground motions scaling for 2%/50 years
Experimental
Simulation
Experimental
Simulation
(c) Normalized BRB stress-strain response
(d) Moment-rotation response

9. Element removal procedure

10. Seismic performance evaluation
Dynamic performance study

11. Dynamic performance study
Median inter-story drift response

12. Dynamic performance study
Median floor acceleration response

13. Seismic performance evaluation
Earthquake financial impact study
Structural Comp.
Building Services
Architect. Comp.
Occupants
Contents

14. Building performance groups

15. Component fragility data

16. Cumulative distribution function

17. Conclusion
Buckling Restrained Knee Brace Truss Moment Frame (BRKBTMF):
Lower initial cost:
Not significantly affected by the architecture layout.
Higher structural performance:
Lower structural demand (floor acceleration and ISD).
Lower repair cost and downtime.

18. Future research Test setup Specimen drawing Acknowledgement to:
Tony Yang (University of British Columbia),
Subhash C. Goel (University of Michigan),
S. Leelataviwat (King Mongkut’s University of Technology).

19. Certificate of Structural
Thank you!
Certificate of Structural
Engineering Program