The experimental research presented in this dissertation aims to develop a new rubber&ndash / based seismic isolator type on the basis of the idea that the damping of a conventional
annular elastomeric bearing (EB) can be increased by filling its central core with small
diameter steel balls, which dissipate energy via friction inside the confined hole of the
bearing during their movements under horizontal loads. The proposed bearing type is
called &ldquo / Ball Rubber Bearing (BRB)&rdquo / . A large set of BRBs with different geometrical and
material properties are manufactured and tested under reversed cyclic horizontal loading at
different vertical compressive load levels. Effect of supplementary confinement in the
central hole of the bearing to performance of BRB is studied by performing some
additional tests. Test results are used to develop design equations for BRB.
A detailed non-linear finite element model is developed to verify the test results. The
proposed analytical model is determined to simulate the structural hysteretic behaviour of
the bearings. In design of BRBs, the proposed design guideline can be used in conjunction
with the proposed non-linear finite element analysis.
Extensive test results indicate that steel balls do not only increase the energy dissipation
capacity of the elastomeric bearing (EB) but also increase its horizontal and vertical
stiffness. It is also observed that the energy dissipation capacity of a BRB does not degrade
as the number of loading cycles increases, which indicates remarkably reliable seismic
performance.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/12612712/index.pdf |
| Date | 01 December 2010 |
| Creators | Ozkaya, Cenan |
| Contributors | Caner, Alp |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | Ph.D. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for public access |
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