Modified substitute structure method for analysis of existing R/C structures

The modified substitute structure method is developed for the earthquake hazard evaluation of existing reinforced concrete buildings constructed before the most recent advances in seismic design codes. The main characteristic of the proposed method is the use of modified linear analysis for predicti...

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Main Author: Yoshida, Sumio
Language:English
Published: 2010
Online Access:http://hdl.handle.net/2429/21580
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spelling ndltd-UBC-oai-circle.library.ubc.ca-2429-215802018-01-05T17:41:09Z Modified substitute structure method for analysis of existing R/C structures Yoshida, Sumio The modified substitute structure method is developed for the earthquake hazard evaluation of existing reinforced concrete buildings constructed before the most recent advances in seismic design codes. The main characteristic of the proposed method is the use of modified linear analysis for predicting the behaviour, including inelastic response, of existing structures when subjected to a given type and intensity of earthquake motion, represented by a linear response spectrum. The procedure involves an extension of the substitute structure method, which was originally proposed by Shibata and Sozen as a design procedure. With properties and strengths of a structure known, the modified substitute structure method computes ductility demand of each member via an elastic modal analysis, in which reduced flexural stiffness and substitute damping factors are used iteratively. As a result of the analysis, it is possible to describe, in general terms, the location and extent of damage that would occur in a structure subjected to earthquakes of different intensity. Several reinforced concrete structures of different sizes and strengths were tested by the proposed method and the results compared with a nonlinear dynamic analysis. In general, a small number of iterations was required to obtain an estimate of damage ratios. The method appears to work well for structures in which yielding is not extensive and widespread. Furthermore, it appears to work better for those in which yielding occurs mainly in beams and the effect of higher modes is not predominant. Though further research is necessary, the modified substitute structure method can constitute an integral part of the rational retrofit procedure. Applied Science, Faculty of Civil Engineering, Department of Unknown 2010-03-05T22:13:59Z 2010-03-05T22:13:59Z 1979 Text Thesis/Dissertation http://hdl.handle.net/2429/21580 eng For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
collection NDLTD
language English
sources NDLTD
description The modified substitute structure method is developed for the earthquake hazard evaluation of existing reinforced concrete buildings constructed before the most recent advances in seismic design codes. The main characteristic of the proposed method is the use of modified linear analysis for predicting the behaviour, including inelastic response, of existing structures when subjected to a given type and intensity of earthquake motion, represented by a linear response spectrum. The procedure involves an extension of the substitute structure method, which was originally proposed by Shibata and Sozen as a design procedure. With properties and strengths of a structure known, the modified substitute structure method computes ductility demand of each member via an elastic modal analysis, in which reduced flexural stiffness and substitute damping factors are used iteratively. As a result of the analysis, it is possible to describe, in general terms, the location and extent of damage that would occur in a structure subjected to earthquakes of different intensity. Several reinforced concrete structures of different sizes and strengths were tested by the proposed method and the results compared with a nonlinear dynamic analysis. In general, a small number of iterations was required to obtain an estimate of damage ratios. The method appears to work well for structures in which yielding is not extensive and widespread. Furthermore, it appears to work better for those in which yielding occurs mainly in beams and the effect of higher modes is not predominant. Though further research is necessary, the modified substitute structure method can constitute an integral part of the rational retrofit procedure. === Applied Science, Faculty of === Civil Engineering, Department of === Unknown
author Yoshida, Sumio
spellingShingle Yoshida, Sumio
Modified substitute structure method for analysis of existing R/C structures
author_facet Yoshida, Sumio
author_sort Yoshida, Sumio
title Modified substitute structure method for analysis of existing R/C structures
title_short Modified substitute structure method for analysis of existing R/C structures
title_full Modified substitute structure method for analysis of existing R/C structures
title_fullStr Modified substitute structure method for analysis of existing R/C structures
title_full_unstemmed Modified substitute structure method for analysis of existing R/C structures
title_sort modified substitute structure method for analysis of existing r/c structures
publishDate 2010
url http://hdl.handle.net/2429/21580
work_keys_str_mv AT yoshidasumio modifiedsubstitutestructuremethodforanalysisofexistingrcstructures
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