DOI QR코드

DOI QR Code

Retrofit Yield Spectra-a practical device in seismic rehabilitation

  • Thermou, G.E. (Department of Civil Engineering, Aristotle University of Thessaloniki) ;
  • Elnashai, A.S. (Department of Civil and Environmental Engineering, Univ. of Illinois at Urbana-Champaign) ;
  • Pantazopoulou, S.J. (Department of Civil and Environmental Engineering, University of Cyprus)
  • 투고 : 2011.07.07
  • 심사 : 2011.12.03
  • 발행 : 2012.04.25

초록

The Retrofit Yield Spectrum (RYS) is a new spectrum-based device that relates seismic demand of a retrofitted structure with the fundamental design parameters of the retrofit. This is obtained from superposition of Yield Point Spectra with design charts that summarize in pertinent spectrum-compatible coordinates the attributes of a number of alternative retrofit scenarios. Therefore, once the requirements for upgrading a given structure have been determined, the RYS enable direct insight of the sensitivity of the seismic response of the upgraded structure to the preliminary design decisions made while establishing the retrofit plan. By virtue of their spectrum-based origin, RYS are derived with reference to a single mode of structural vibration; a primary objective is to control the contribution of this mode in the retrofit design so as to produce a desirable distribution of damage at the ultimate limit state by removing soft storey formations and engaging the maximum number of structural members in deformation, in response to the input motion. Calculations are performed with reference to the yield-point, where secant stiffness is proportional to the flexural strength of reinforced concrete members. Derivation and use of the Retrofit Yield Spectra (RYS) refers to the seismic demand expressed either in terms of spectral acceleration, spectral displacement or interstory drift, at yield of the first storey. A reinforced concrete building that has been tested in full scale to a sequence of simulated earthquake excitations is used in the paper as a demonstration case study to examine the effectiveness of the proposed methodology.

키워드

참고문헌

  1. Aschheim, M.A. and Black, E.F. (2000), "Yield Point Spectra for seismic design and rehabilitation", Earthq. Spectra, 16(2), 317-336. https://doi.org/10.1193/1.1586115
  2. Clough, R.W. and Penzien, J.(1993), Dynamics of Structures. McGraw-Hill International Editions, 2nd Edition.
  3. Dunand, F., Rodgers, J.E., Acosta, A.V., Salsman, M., Bard, P.Y. and Celebi, M. (2004), "Ambient vibration and earthquake strong-motion data sets for selected USGS extensively instrumented buildings." U.S. Dept. of the Interior, U.S. Geological Survey, Open-File Report 2004-1375, pp. 31.
  4. Eurocode 8 (2004), "Design of structures for earthquake resistance - Part 1: General rules, seismic actions and rules for buildings", EN1998-1-2004:E, European Committee for Standardisation CEN, Brussels.
  5. Ivanoviæ, S.S., Trifunac, M.D. and Todorovska, M.I. (2000), "Ambient vibration tests of structures - a review", ISET J. Earthq. Technol., 37(4), 165-197.
  6. Pinto, A., Verzeletti, G., Molina, J., Varum, H., Pinho, R. and Coehlo, E. (2002), "Pseudo-dynamic tests on nonseismic resisting RC frames (bare and selective retrofit frames)", EUR Report 20244EN, JRC, Ispra, Italy.
  7. Thermou, G.E. (2007), Design and assessment models and spectra for repaired reinforced concrete structures, PhD Thesis, Civil Engineering Department, Demokritus University of Thrace.
  8. Thermou, G.E., Pantazopoulou, S.J. and Elnashai, A.S. (2007), "Design methodology for seismic upgrading of substandard RC structures", J. Earthq. Eng., 4(1), 582-606.

피인용 문헌

  1. Retrofit Design Methodology for Substandard R.C. Buildings with Torsional Sensitivity 2017, https://doi.org/10.1080/13632469.2016.1277569
  2. Seismic Rehabilitation of Substandard R.C. Buildings with Masonry Infills pp.1559-808X, 2020, https://doi.org/10.1080/13632469.2018.1453397
  3. Development of seismic collapse capacity spectra for structures with deteriorating properties vol.12, pp.3, 2012, https://doi.org/10.12989/eas.2017.12.3.297