Retrofit Yield Spectra-A practical device in seismic rehabilitation

G. E. Thermou, Amr S. Elnashai, S. J. Pantazopoulou

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

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 spectrumcompatible 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.

Original languageEnglish (US)
Pages (from-to)141-168
Number of pages28
JournalEarthquake and Structures
Volume3
Issue number2
DOIs
StatePublished - Jan 1 2012

Fingerprint

Patient rehabilitation
Reinforced concrete
Concrete buildings
Structural members
Seismic response
Bending strength
Earthquakes
Demonstrations
Stiffness

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering

Cite this

Thermou, G. E. ; Elnashai, Amr S. ; Pantazopoulou, S. J. / Retrofit Yield Spectra-A practical device in seismic rehabilitation. In: Earthquake and Structures. 2012 ; Vol. 3, No. 2. pp. 141-168.
@article{9777baf83f454f6f9e614e58d537cf34,
title = "Retrofit Yield Spectra-A practical device in seismic rehabilitation",
abstract = "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 spectrumcompatible 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.",
author = "Thermou, {G. E.} and Elnashai, {Amr S.} and Pantazopoulou, {S. J.}",
year = "2012",
month = "1",
day = "1",
doi = "10.12989/eas.2012.3.2.141",
language = "English (US)",
volume = "3",
pages = "141--168",
journal = "Earthquake and Structures",
issn = "2092-7614",
publisher = "Techno Press",
number = "2",

}

Retrofit Yield Spectra-A practical device in seismic rehabilitation. / Thermou, G. E.; Elnashai, Amr S.; Pantazopoulou, S. J.

In: Earthquake and Structures, Vol. 3, No. 2, 01.01.2012, p. 141-168.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Retrofit Yield Spectra-A practical device in seismic rehabilitation

AU - Thermou, G. E.

AU - Elnashai, Amr S.

AU - Pantazopoulou, S. J.

PY - 2012/1/1

Y1 - 2012/1/1

N2 - 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 spectrumcompatible 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.

AB - 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 spectrumcompatible 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.

UR - http://www.scopus.com/inward/record.url?scp=84861840910&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84861840910&partnerID=8YFLogxK

U2 - 10.12989/eas.2012.3.2.141

DO - 10.12989/eas.2012.3.2.141

M3 - Article

VL - 3

SP - 141

EP - 168

JO - Earthquake and Structures

JF - Earthquake and Structures

SN - 2092-7614

IS - 2

ER -