12/6/2012 Research in Seismic Isolation E-D ofense Experiments:5 story steel moment fra se Experiments:5 story steel m E-Defense Experiments:5 story steel moment frame :55 /stool mor E-Defense Experiments:5 story stoel moment frame 812/6/2012 8 Course Seminar, Tongji University, December 12, 2012 Research in Seismic Isolation • Concept of seismic isolation by rocking or sliding dates back to 300 BC • Research into modern isolation systems initiated with Lead Rubber Bearings in New Zealand in 1970’s. • Numerous experimental and numerical studies have been done on seismic isolation including shake table studies • Current research on hardware • Modeling and component testing of seismic isolation devices • Behavior of elastomeric bearings at large displacements, including stability under large axial loads • Verification of bearing behavior at full-scale • Current research on seismic isolation systems • Verification of system level behavior at full scale • Life-cycle cost analysis to demonstrate cost benefit • Behavior of seismic isolation systems under extreme earthquakes • Applications to nuclear power plants Course Seminar, Tongji University, December 12, 2012 Shake table tests of a full‐scale 5‐story steel moment frame building (PI: K. Ryan, Reno; S. Mahin, Berkeley; G. Mosqueda, San Diego)  triple friction pendulum isolators  lead rubber bearing/cross linear slider  Fixed base o Simulations designed to impose large displacement demands in isolation systems o Simulations both with and without vertical component of ground motion o 4th and 5th floor included nonstructural systems E-Defense Experiments: 5 story steel moment frame Course Seminar, Tongji University, December 12, 2012 E-Defense Experiments: 5 story steel moment frame Course Seminar, Tongji University, December 12, 2012 E-Defense Experiments: 5 story steel moment frame Course Seminar, Tongji University, December 12, 2012 E-Defense Experiments: 5 story steel moment frame Course Seminar, Tongji University, December 12, 2012 E-Defense Experiments: 5 story steel moment frame Level Peak Acceleration Profile Peak Acc. (g) • Measured response 50 60 70 80 90 100 -0.5 0 0.5 -0.48446 -0.11864 0.14598 Fixed Base TPB Isolated LRB Isolated 50 60 70 80 90 100 -0.5 0 0.5 0.5844 0.14362 -0.23067 Base Shear Coefficient X‐direction Y‐direction Time (sec)