1 / 26

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

angeni
Download Presentation

7 November 2012, EERI, Rice Chapter

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

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

  2. 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

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

  4. Critical damping 7 November 2012, EERI, Rice Chapter

  5. Spectrum 7 November 2012, EERI, Rice Chapter

  6. Spectrum 7 November 2012, EERI, Rice Chapter

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

  8. Tuned mass damper 7 November 2012, EERI, Rice Chapter

  9. Tuned mass damper 7 November 2012, EERI, Rice Chapter

  10. Tuned mass damper 7 November 2012, EERI, Rice Chapter

  11. 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, 93-132. 7 November 2012, EERI, Rice Chapter

  12. 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, 93-132. 7 November 2012, EERI, Rice Chapter

  13. 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, 93-132. 7 November 2012, EERI, Rice Chapter

  14. 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, 93-132. 7 November 2012, EERI, Rice Chapter

  15. Constantinou, MC, Symans, MD, (1999)

  16. Constantinou, MC, Symans, MD, (1999)

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

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

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

  20. Viscoelastic dampers 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. Wallace F. Bennet Building, Salt Lake City, Utah, USA 7 November 2012, EERI, Rice Chapter

  21. Friction dampers Nagarajaiah, S. et al. (1992) “Experimental study of sliding isolated structures with uplift restraint,” J. Struct. Engrg., vol. 118, no. 6, 1666-1682. (page no. 1678). Constantinou, MC and Symans, MD, (1993), “Seismic response of structures with supplemental damping,” The Structural Design of Tall Buildings, vol. 2, 77-92. 7 November 2012, EERI, Rice Chapter

  22. Friction dampers Patient Tower, Seattle, USA Monterey County Govt. Center, Monterey County, 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

  23. Damping force - summary Friction Dampers Steel yielding device Viscoelastic device Viscous device Constantinou, MC and Symans, MD, (1993), “Seismic response of structures with supplemental damping,” The Structural Design of Tall Buildings, vol. 2, 77-92. 7 November 2012, EERI, Rice Chapter

  24. 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.

  25. Symans, MD et al., (2008)

  26. 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. 7 November 2012, EERI, Rice Chapter

More Related