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Computers and Concrete
  Volume 8, Number 6, December 2011, pages 693-715
DOI: http://dx.doi.org/10.12989/cac.2011.8.6.693
 


Site-response effects on RC buildings isolated by triple concave friction pendulum bearings
Sevket Ates and Muhammet Yurdakul

 
Abstract
    The main object of this study is to evaluate the seismic response effects on a reinforced concrete building isolated by triple concave friction pendulum (TCFP) bearings. The site-response effects arise from the difference in the local soil conditions at the support points of the buildings. The local soil conditions are, therefore, considered as soft, medium and firm; separately. The results on the responses of the isolated building are compared with those of the non-isolated. The building model used in the time history analysis, which is a two-dimensional and eight-storey reinforced concrete building with and without the seismic isolation bearings and/or the local soil conditions, is composed of two-dimensional moment resisting frames for superstructure and of plane elements featuring plane-stress for substructure. The TCFP bearings for isolating the building are modelled as of a series arrangement of the three single concave friction pendulum (SCFP) bearings. In order to investigate the efficiency of both the seismic isolation bearings and the site-response effects on the buildings, the time history analyses are elaborately conducted. It is noted that the site-response effects are important for the isolated building constructed on soft, medium or firm type local foundation soil. The results of the analysis demonstrate that the siteresponse has significant effects on the response values of the structure-seismic isolation-foundation soil system.
 
Key Words
    seismic isolation; triple concave friction pendulum; gap elements; non-linear link element; site-response effects; series model; reinforced concrete building.
 
Address
Sevket Ates: Karadeniz Technical University, Department of Civil Engineering, Trabzon, Turkey
Muhammet Yurdakul: Bayburt University, Department of Civil Engineering, Bayburt, Turkey
 

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