12/6/2012 Outline of Presentation Seismic Design of Building Structures Seismic Isolation and Energy Dissipation Gilberto Mosqueda Associate Professor of Structural Engineering Investment in Building Construction Recent Earthquakes p()and Feb (NZ arthquake uctural damage r3garmgn2a。wasvey Structural Damage to Buildings in chile Structural Damage to Buildings in Chile 1 12/6/2012 1 College of Civil Engineering, Tongji University Seismic Design of Building Structures Seismic Isolation and Energy Dissipation Gilberto Mosqueda Associate Professor University of California, San Diego Department of Structural Engineering Course Seminar, Tongji University, December 12, 2012 Outline of Presentation • Damage to Structures in Recent Earthquakes • Damage to structural and nonstructural systems • Disruption of critical services • Seismic Isolation • Principles of seismic isolation structures • Hardware – elastomeric and friction bearings • Dynamic properties of isolated structures • Code requirements • Applications to Buildings • Energy Dissipation • Damping devices • Example applications • Current Research in Protective Systems Course Seminar, Tongji University, December 12, 2012 Investment in Building Construction • Only a small portion of construction investments in buildings is related to the cost of the structural skeleton system • For earthquake resistant design, focus is mainly on structural system Typical investment of building construction (from Miranda, 2003) Course Seminar, Tongji University, December 12, 2012 Recent Earthquakes • Feb 27th, 2010 (M 8.8) Maule, Chile earthquake • Collapse of few modern buildings and bridges, several RC buildings damaged beyond repair • Massive amount of nonstructural damage that lead to large impact and significant disruption to Chilean society • Sept 4, 2010 (M 7.1) and Feb 22nd, 2011 (6.3) NZ earthquakes • Structural collapse mainly of URM structures • Significant liquefaction • Large amount of nonstructural damage • March 11th, 2011 Great Eastern Japan earthquake • Not considering tsunami inundation zone, there was very little structural damage due to shaking • Majority of damage in large cities including Tokyo and Sendai was mainly nonstructural Course Seminar, Tongji University, December 12, 2012 Photo Associated Press Structural Damage to Buildings in Chile Course Seminar, Tongji University, December 12, 2012 Photos E. Miranda Structural Damage to Buildings in Chile