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    Zdravko Bonev · Golubka Necevska-Cvetanovska · Elena Vaseva · Roberta Apostolska · Dilyan Blagov
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    ABSTRACT: The paper deals with application of capacity spectrum method which is extended to provide estimate for seismic demands for specific type of structure and variable boundary conditions. Flat slab—R/C wall systems are considered. Flexible shallow wall foundations are used because of soil deformations. Only elastic soil properties are considered. Foundation motion is implemented assuming new additional degrees of freedom instead of standard fixed end. The only rocking motion of the footing is accounted for as the most essential. The influence of foundation flexibility on the seismic demands is evaluated using capacity spectrum method. Numerical results for a single wall and for overall structure are graphically represented. It is concluded that soil conditions are very important for the design seismic response of wall systems. Some important conclusions are made.
    Full-text · Chapter · Dec 2008
  • Golubka Necevska-Cvetanovska · Roberta Apostolska
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    ABSTRACT: The paper deals with application of an originally developed methodology for repair and seismic strengthening of St. Clement’s Church, Plaoshnik, Ohrid. To renovate the structure based on the original foundation dating back to the 9th century, complex multidisciplinary investigations were performed in the field of archaeology, conservation, engineering and construction. Presented in this paper are the investigations related to the design of the structural system based on elaborated architectonic bases that are to preserve the authenticity of the structure, performed geotechnical investigations of the site and defined input seismic parameters. A linear-elastic and nonlinear dynamic analysis of the structure was performed. Based on the obtained results, the concept of repair and seismic strengthening of the church was adopted. It consisted of incorporation of horizontal and vertical steel ties in the bearing walls of the structure. This method, which is based on the philosophy of “minimal intervention–maximal protection”, had originally been developed at IZIIS, Skopje and it has been experimentally and analytically verified. The techniques of consolidation of the authentic foundation of the structure and the existing walls with original fresco-paintings are also presented.
    No preview · Article · Aug 2008 · Engineering Structures
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    Roberta Apostolska · Golubka Necevska-Cvetanovska
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    ABSTRACT: The IZIIS' contribution to development of high quality materials has been seen in realization of several scientific-research projects in the field of high strength concrete in the period from 1992 to 2006. Within the frames of these projects complex laboratory-experimental-analytical investigations have been performed to contribute to definition of the methodology for obtaining high stength concrete ex-clusively from domestic resources, to investigate joint behaviour of high strength materials and elements in nonlinear range as well as to define dynamic behaviour high strength concrete buildings exposed to seismic actions. The selected results from these investigations are presented in the paper.
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    E Mistakidis · R Apostolska · D Dubina · W Graf · G Necevska-Cvetanovska · P Nogueiro · S Pannier · J.-U Sickert · L Simões · A Stratan · U Terzic

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