Summer Research Projects 2014

Yuanjie LiMASc | The University of British Columbia, CanadaSupervised by Tony Yang, Ph.D.

The 5th Tongji-UBC Symposium on Earthquake Engineering Facing Earthquake Challenges Together May 4-8 2015, Tongji University, Shanghai, China

Performance Assessment of Buckling Restrained Knee Braced Truss Moment Frame (BRKBTMF) System2

Resilient long-span seismic systemLong-span truss

Buckling restrained brace (BRB)

Introduction3Buckling restrained knee braced truss moment frame (BRKBTMF)

Univ. of MichiganIIT, KanpurKing Mongkuts Univ. of Tech.

4Performance-based plastic design procedure

Design procedure5Seismic performance evaluation

Plan view30 ft.45 ft.60 ft.Prototype building6

30 ft.45 ft.60 ft.BRKBTMFMoment frame (MF)Prototype building7BRKBTMFMFSeismic performance evaluationInitial cost comparison8

(a) Target spectra for three hazard(b) Ground motions scaling for 2%/50 years

ExperimentalSimulation (c) Normalized BRB stress-strain response

(d) Moment-rotation responseExperimentalSimulation Seismic performance evaluationGround motion and experimental calibration9

Element removal procedure10

Seismic performance evaluationDynamic performance study11

Median inter-story drift responseDynamic performance study12Median floor acceleration response

Dynamic performance study13

Structural Comp.ContentsArchitect. Comp.Building ServicesOccupantsSeismic performance evaluationEarthquake financial impact study14

Building performance groups15Component fragility data

16Cumulative distribution function

17ConclusionBuckling 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. 18Future researchAcknowledgement to:Tony Yang (University of British Columbia),Subhash C. Goel (University of Michigan), S. Leelataviwat (King Mongkuts University of Technology).

Test setupSpecimen drawingThank you!19

Certificate of Structural Engineering Program