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NASCC/ASCE Thursday May 13, 2010 Transforming Seismic Design in Low to Moderate Seismic Regions PDH #BN81C Session Chairs: Eric HinesCharlie Carter LeMessurierAISC.

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Presentation on theme: "NASCC/ASCE Thursday May 13, 2010 Transforming Seismic Design in Low to Moderate Seismic Regions PDH #BN81C Session Chairs: Eric HinesCharlie Carter LeMessurierAISC."— Presentation transcript:

1 NASCC/ASCE Thursday May 13, 2010 Transforming Seismic Design in Low to Moderate Seismic Regions PDH #BN81C Session Chairs: Eric HinesCharlie Carter LeMessurierAISC Tufts University

2 Design Philosophy for Moderate Seismic Regions Reserve Capacity – CBF Ductility – EBF Elastic Flexibility – MRF Elastic Strength

3 Design Philosophy for Moderate Seismic Regions Reserve Capacity – CBF Ductility – EBF Elastic Flexibility – MRF Elastic Strength

4 Design Philosophy for Moderate Seismic Regions Reserve Capacity – CBF Ductility – EBF Elastic Flexibility – MRF Elastic Strength

5 Design Philosophy for Moderate Seismic Regions Reserve Capacity – CBF Ductility – EBF Elastic Flexibility – MRF Elastic Strength

6 Design Philosophy for Moderate Seismic Regions Reserve Capacity – CBF Ductility – EBF Elastic Flexibility – MRF Elastic Strength

7 NASCC/ASCE Thursday May 20, 2010 Eccentric Braced Frame System Performance Eric HinesCarlo Jacob LeMessurierTufts University Tufts University OCBF: V = 531k EBF: V = 162 k (266k) 0.06 IBC 2006 (USGS 2002); MSBC % in 50 year, Sa for T = 1.0s

8 OCBF: V = 531k EBF: V = 162 k (266k) 0.06 IBC 2006 (USGS 2002); MSBC % in 50 year, Sa for T = 1.0s

9 EBF R-Factors

10 Whittaker, Uang, Bertero (1987) Univ. California at Berkeley EBF shake table test 6-story 1/3 scale

11 UCB Test Jacob Model

12 Hysteresis at Level 2 Link UCB Test Jacob Model

13 Hysteresis at Level 2 Link Jacob UCB Model Jacob ASCE Model

14 Jacob UCB Model Jacob ASCE Model

15 9-Story Prototype

16 Up to 72 Links max = 0.02 rad Up to 72 Links max = 0.41 rad 9-Story Prototype

17 Up to 72 Links max = 0.02 rad Up to 72 Links max = 0.41 rad Up to 48 Links max = 0.02 rad Up to 48 Links max = 0.41 rad

18 Up to 24 Links max = 0.80 rad Up to 24 Links max = 0.81 rad Up to 48 Links max = 0.02 rad Up to 48 Links max = 0.41 rad

19 Up to 24 Links max = 0.80 rad Up to 24 Links max = 0.81 rad P u / P n GM7810 Scale Column Axial Loads 1.2D + 0.5L + 1.0E

20 P u / P n GM7810 Scale Column Axial Loads 1.2D + 0.5L + 1.0E

21 0.73

22

23


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