Design and Retrofit Methodology for Building Structures with Supplemental Energy Dissipating Systems
Author: G.Pekcan, J.B. Mander, S.S. Chen | Size: 5.6 MB | Format: PDF | Quality: Scanner | Publisher: MCEER | Year: 1999 | pages: 174
From NISEE library.
This report focuses on two fundamental issues related to the design of nonlinear viscous dampers for building structures: structural velocities and equivalent viscous damping. It begins with an overview of the capacity-demand spectral design approach and includes various steps involved in the pushover analysis to determine the structural capacity. An alternative elasto-plastic analysis approach is also introduced. Fundamental considerations for the design of supplmental damping systems are reviewed and the design formulations for a pseudo-actual velocity transformation are given following a discussion of the differences between the two quantities. The proposed equivalent linear damping for the nonlinear [viscous nature] devices based on the equivalent power comsumption approach is presented. Finally, various phases involved in designing supplemental systems are given Design steps for 2 alternative device configurations are given. A retrofit design example of a 9-story flexible steel building is presented and the performance of the two alternative configurations is discussed.
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evelopment and Evaluation of Simplified Procedures for Analysis and Design of Buildings with Passive Energy Dissipation Systems
Author: O.M.Ramirez, M.C.Constantinou, C.A.Kircher, A.S.Whittaker, M.W.Johnson, J.D.Gomez and C.Z. Chrysostomou | Size: 13.52 MB | Format: PDF | Quality: Scanner | Publisher: MCEER | Year: 2000 | pages: 492
From NISEE library.
This report presents the development and evaluation of simplified methods of analysis and design for buildings with passive energy dissipation systems. The work was conducted under the auspices of the Building Seismic Safety Council, Technical Subcommittee 12, Base Isolation and Energy Dissipation, for the year 2000 update of the "NEHRP Recommended Provisions for Seismic Regulations for New Buildings and Other Structures." Topics presented in the report include development of extended damping coefficients for modification of response spectra for damping in excess of 5% of critical; development of relationships between elastic and inelastic displacement of yielding systems with energy dissipating devices; a study of displacement ductility demand in yielding structures with viscous damping systems; development of equivalent lateral force and modal analysis procedures for buildings with damping systems; and validation studies of the developed analysis procedures using 3- and 6-story structures with linear viscous, nonlinear viscous, solid viscoelastic and yielding damping systems.
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