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Title of Journal: Bull Earthquake Eng

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Abbravation: Bulletin of Earthquake Engineering

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Springer Netherlands

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DOI

10.1002/9781118407738.ins

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1573-1456

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Equivalent viscous damping for displacementbased

Authors: Fabio Mazza Alfonso Vulcano
Publish Date: 2014/03/01
Volume: 12, Issue: 6, Pages: 2797-2819
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Abstract

A displacementbased design DBD procedure aiming to proportion hysteretic damped braces HYDBs in order to attain for a specific level of seismic intensity a designated performance level of a structure is proposed for the retrofitting of framed buildings A key step for the reliability of the DBD procedure is the selection of the equivalent viscous damping in order to account for the energy dissipated by the damped braced frame In this paper expressions of the equivalent damping are obtained considering the energy dissipated by the HYDBs and the framed structure To this end dynamic analyses of an equivalent single degree of freedom system whose response is idealized by a trilinear model are carried out considering real accelerograms matching on the average Eurocode 8 EC8 response spectrum for a medium subsoil class Then a threestorey reinforced concrete rc framed structure of a school building designed in a mediumrisk seismic region according to the Italian code in force in 1975 is supposed as retrofitted as if in a highrisk seismic region of the current seismic code NTC08 by the insertion of HYDBs Nonlinear static analyses are carried out to evaluate the vulnerability of the primary structure characterized by the lack of interior girders along the floor slab direction and to select optimal properties of the HYDBs The effectiveness of the retrofitting solutions is checked referring to nonlinear dynamic analyses considering artificially generated accelerograms whose response spectra match those adopted by NTC08 for the earthquake design levels corresponding to the serviceability and ultimate limit states

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  2. Response spectrum analysis for non-classically damped linear system with multiple-support excitations
  3. On the vulnerability assessment of monumental buildings
  4. Small centres damaged by 2009 L’Aquila earthquake: on site analyses of historical masonry aggregates
  5. Evidence of beneficial role of inclined piles: observations and summary of numerical analyses
  6. Results and analytical simulation of axial and diagonal compression tests on reinforced concrete panels cast with wood blocks system
  7. Consistency of ground-motion predictions from the past four decades
  8. A method for the direct determination of approximate floor response spectra for SDOF inelastic structures
  9. Accounting for end-user preferences in earthquake early warning systems
  10. Analytical prediction of ultimate moment and curvature of RC rectangular sections in compression
  11. Seismic performance of masonry residential buildings in Lorca’s city centre, after the 11th May 2011 earthquake
  12. A first approach to earthquake damage estimation in Haiti: advices to minimize the seismic risk
  13. The relevance of energy damping in unreinforced masonry rocking mechanisms. Experimental and analytic investigations
  14. Damage to residential buildings in Hveragerði during the 2008 Ölfus Earthquake: simulated and surveyed results
  15. Collapse risk and residual drift performance of steel buildings using post-tensioned MRFs and viscous dampers in near-fault regions
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