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

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

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

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

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

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

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

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

EBF R-Factors

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

UCB Test Jacob Model

Hysteresis at Level 2 Link UCB Test Jacob Model

Hysteresis at Level 2 Link Jacob UCB Model Jacob ASCE Model

Jacob UCB Model Jacob ASCE Model

9-Story Prototype

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

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

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

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

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

0.73