7 November 2012, EERI, Rice Chapter Introduction to Damping and Dampers Vishnu PhD Candidate Dept. of Civil and Environmental Engineering Rice University, Houston, TX

7 November 2012, EERI, Rice Chapter Fundamentals Three fundamental properties of any structure – Mass, m – Stiffness, k – Damping, c Occurs naturally in structures – Microcracks – Microslip among frictional interfaces – Joints

7 November 2012, EERI, Rice Chapter Damping – SDOF system SDOF – Single Degree of Freedom System

7 November 2012, EERI, Rice Chapter Critical damping

7 November 2012, EERI, Rice Chapter Spectrum

7 November 2012, EERI, Rice Chapter Spectrum

7 November 2012, EERI, Rice Chapter Multi Degree of Freedom System

7 November 2012, EERI, Rice Chapter Tuned mass damper

7 November 2012, EERI, Rice Chapter Tuned mass damper

7 November 2012, EERI, Rice Chapter Tuned mass damper

7 November 2012, EERI, Rice Chapter Fluid dampers Constantinou, MC, Symans, MD, (1999) “Experimental study of seismic response of buildings with supplemental fluid dampers,” The Structural Design of Tall Buildings, Vol. 2,

7 November 2012, EERI, Rice Chapter Fluid dampers Constantinou, MC, Symans, MD, (1999) “Experimental study of seismic response of buildings with supplemental fluid dampers,” The Structural Design of Tall Buildings, Vol. 2,

7 November 2012, EERI, Rice Chapter Fluid dampers Constantinou, MC, Symans, MD, (1999) “Experimental study of seismic response of buildings with supplemental fluid dampers,” The Structural Design of Tall Buildings, Vol. 2,

7 November 2012, EERI, Rice Chapter Fluid dampers Constantinou, MC, Symans, MD, (1999) “Experimental study of seismic response of buildings with supplemental fluid dampers,” The Structural Design of Tall Buildings, Vol. 2,

Constantinou, MC, Symans, MD, (1999)

7 November 2012, EERI, Rice Chapter MR dampers (no damper)

7 November 2012, EERI, Rice Chapter MR dampers (1 damper)

7 November 2012, EERI, Rice Chapter MR dampers (>1 damper)

7 November 2012, EERI, Rice Chapter Viscoelastic dampers Wallace F. Bennet Building, Salt Lake City, Utah, USA Kaiser Santa Clara Medical Hospital, Santa Clara, California, USA Symans, MD et al., (2008) “Energy Dissipation Systems for Seismic Applications: Current Practice and Recent Developments,” J. of Struct. Engrg, vol. 134, No.1, 3-21.

7 November 2012, EERI, Rice Chapter Friction dampers Constantinou, MC and Symans, MD, (1993), “Seismic response of structures with supplemental damping,” The Structural Design of Tall Buildings, vol. 2, Nagarajaiah, S. et al. (1992) “Experimental study of sliding isolated structures with uplift restraint,” J. Struct. Engrg., vol. 118, no. 6, (page no. 1678).

7 November 2012, EERI, Rice Chapter Friction dampers Monterey County Govt. Center, Monterey County, California, USA Patient Tower, Seattle, USA Symans, MD et al., (2008) “Energy Dissipation Systems for Seismic Applications: Current Practice and Recent Developments,” J. of Struct. Engrg, vol. 134, No.1, 3-21.

7 November 2012, EERI, Rice Chapter Damping force - summary a)Friction Dampers b)Steel yielding device c)Viscoelastic device d)Viscous device Constantinou, MC and Symans, MD, (1993), “Seismic response of structures with supplemental damping,” The Structural Design of Tall Buildings, vol. 2,

Symans, MD et al., (2008) “Energy Dissipation Systems for Seismic Applications: Current Practice and Recent Developments,” J. of Struct. Engrg, vol. 134, No.1, 3-21.

Symans, MD et al., (2008)

7 November 2012, EERI, Rice Chapter Summary Supplemental damping can be provided and is very effective. When choosing a supplemental damping strategy scaling is a very important phenomenon that needs to be taken into account.