12/6/2012 Supplemental Damping Supplemental Damping ded concrete tube to pgevent buckling 代 Supplemental Damping Further Reading d se 0020 1012/6/2012 10 Course Seminar, Tongji University, December 12, 2012 Supplemental Damping • Buckling restrained brace (BRB) • Steel brace encased in an unbonded concrete tube to prevent buckling Course Seminar, Tongji University, December 12, 2012 Supplemental Damping • Viscous dampers provide velocity dependent force by forcing fluid through an orifice to dissipate energy • Force-velocity relation can be linear or nonlinear and given by ݒ ܥ ൌ ܨ Course Seminar, Tongji University, December 12, 2012 Supplemental Damping • Geometric amplification of damping devices to increase effectiveness Course Seminar, Tongji University, December 12, 2012 Further Reading • C. Christopoulos and A. Filiatrault (2006) “Principles of Passive Supplemental Damping and Seismic Isolation” IUSS Press • F. Naeim and J. Kelly (1999) “Design of Seismic Isolated Structures, From Theory to Practice” John Wiley & Sons • P Pan, LP Ye, W Shi and HY Cao (2012) “Engineering Practice of seismic isolation and energy dissipation structures in China” Science China