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Material identification and characterization of theirproperties for scaled base isolation experiments

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  1. Tez No: 722611
  2. Yazar: YUSUF GÜZEL
  3. Danışmanlar: DR. SEAN WILKINSON
  4. Tez Türü: Yüksek Lisans
  5. Konular: İnşaat Mühendisliği, Civil Engineering
  6. Anahtar Kelimeler: base isolation system, lead rubber bearing, HDRB, scaling laws, shaking table, shifting of ground motion, rubber
  7. Yıl: 2014
  8. Dil: İngilizce
  9. Üniversite: Unıversıty Of Newcastle Upon Tyne
  10. Enstitü: Yurtdışı Enstitü
  11. Ana Bilim Dalı: Belirtilmemiş.
  12. Bilim Dalı: Belirtilmemiş.
  13. Sayfa Sayısı: Belirtilmemiş.

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Özet (Çeviri)

Base isolation devices are the best means of protecting structural and non-structural elements from damaged as well as guaranteeing life safety during and after a seismic action. One of the ways to assess the response of the base isolated structure under the dynamic earthquake load is to conduct physical testing, namely shaking table test. Representation of the real base isolated structure on a shaking table usually requires using a scaled model. The material used for the elements (columns, beams, slabs and bearings) of the model play a vital role in ensuring the test results that can be transposed to the real structure. In this project, it is aimed to identify materials for scaled base isolation (bearing) experiments, which has not been enlarged beyond the materials used in full-scale bearing. In order to do that, four-story base isolated RC medical structure has been selected as a real structure and the bearing type of the structure is HDRB with 0.75 m diameter, 0.55 m height and 36.75 shape factor. Only the first story has been considered for scaling because applying scaling laws to whole structure is complicated task that cannot be manageable in this allocated time. First story of the considered structure has been scaled by taking into account the capacity of the shaking table with applying length scale factor of 1/10 and Young's modulus scale factor of 6,67. Seven earthquake records have been selected in accordance with the code requirement (EC8) and for the model the average earthquake motion has been compressed with scale factor of 0.13 for the purpose of making the motion suitable with the period of the model. Firstly, the real structure and the model one are analysed in GSA as a fixed base and depending on their displacement ratio, which is 41, the required displacement from the scaled base isolation is computed as 0.018 m in relation to the displacement of the base isolated prototype, which is essential to assign dimensions of scaled base isolation based on materials' properties. Two types of material are used (HDRB and rubber) and 5 and 6 samples have been obtained in different sizes, respectively. It is concluded GUZEL/2014 IV that the aspect ratios of the provided samples are not practical in comparison with real application values for a pad bearing. Nevertheless, it can be said that the stability, critical load capacity and rocking motion of the samples should be taken into consideration at 0.018 mm displacement in real scaled base isolation experiment (shaking table test) to check their validity in full sense.

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