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Research Article

Strength reduction factors for existing mid-rise RC buildings for different performance levels

Hayri Baytan Ozmen1, Mehmet Inel2

1Department of Civil Engineering, Usak University, 64200 Usak, Turkey
2Department of Civil Engineering, Pamukkale University, 20070 Denizli, Turkey

Keywords

Abstract

Ductility,

Overstrength, 

Reinforced concrete,

 Response modification factor,

Response reduction factor,

Site class


Many earthquake prone countries have significant amount of existing deficient buildings to be evaluated for seismic actions. Although nonlinear methods are more preferable for assessment of existing buildings, most of the practicing engineers are unfamiliar to these methods. Therefore, linear methods seem to be in use in the near future for assessment of great number of deficient existing buildings in a reasonable time. In linear methods, nonlinear behaviour is taken into account by a single parameter: strength reduction factor (R) which is used to greatly reduce the elastic force demand accounting for the nonlinear behaviour. This study evaluates the use of R factors for different ductility and performance levels of buildings with respect to different soil site class. It is observed that the R factors: decrease with increasing periods, are more sensitive for higher performance levels, may change more than 30% with respect to number of story or transverse reinforcement amount, and may change 20% depending on the site class. However, effect of site class is generally smaller and a clear trend is not observed. Exemplary R values for different ductility, performance levels and number of stories are provided in the study.

 © 2018 MIM Research Group. All rights reserved.

DOI: http://dx.doi.org/10.17515/resm2018.60ea3107                          Full Text

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24/11/2018 Frequency Increase: Due to the high number of submissions, our journal is going to publish 4 issues per year starting with 2018. Issues are going to be published in February, June, September and December. The 2018 December issue will be published soon. We thank all of our contributors for their support.


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Last Update:

04.12.2018

(dd.mm.yyyy)