Optimal weakening and damping using polynomial control for seismically excited nonlinear structures
- 95 Downloads
This paper presents an approach for the optimal design of a new retrofit technique called weakening and damping that is valid for civil engineering inelastic structures. An alternative design methodology is developed with respect to the existing ones that is able to determine the locations and the magnitude of weakening and/or softening of structural elements and adding damping while insuring structural stability. An optimal polynomial controller that is a summation of polynomials in nonlinear states is used in Phase 1 of the method to reduce the peak response quantities of seismically excited nonlinear or hysteretic systems. The main advantage of the optimal polynomial controller is that it is able to automatically stabilize the structural system. The optimal design of a shear-type structure is used as an example to illustrate the feasibility of the proposed approach, which leads to a reduction of both peak inter-story drifts and peak total accelerations.
Keywordsweakening and damping optimal design optimal polynomial controller inter-story drift acceleration
Unable to display preview. Download preview PDF.
- Christopoulos C and Filiatrault A (2006), Principle of Passive Supplemental Damping and Seismic Isolation IUSS Press, University of Pavia, Italy, pp. 480.Google Scholar
- Reinhorn AM, Li C and Constantinou MC (1995), “Experimental and Analytical Investigation of Seismic Retrofit of Structures with Supplemental Damping, Part I Fluid Viscous Damping devices,” Technical Report NCEER-95-0001, National Center for Earthquake Engineering Research, SUNY/BuffaloGoogle Scholar
- Slotine JJ and Li W (1991). Applied Nonlinear Control, Prentice Hall. London.Google Scholar
- Soong TT (1990). “Active Structural Control: Theory and Practice,” Longman Scientific & Technical, England.Google Scholar
- Soong TT and Dargush G (1997), “Passive Energy Dissipation Systems in Structural Engineering,” New York: John Wiley & Sons, Chechester.Google Scholar
- Viti S, Cimellaro GP and Reinhorn AM (2006), “Retrofit of a Hospital Through Strength Reduction and Enhanced Damping,” Smart Structures and Systems, 2(4): 339–355.Google Scholar