Low-cost seismic base isolation using scrap tire pads (stp)

Download

index.pdf

Date

2006

Author

Özden, Bayezid

Metadata

Show full item record

Item Usage Stats

216
views

80
downloads

This thesis focuses on the experimental studies conducted on the development of low-cost seismic base isolation pads using scrap automobile tires. Seismic base isolation is a well-defined building protection system against earthquakes, on which numerous studies have been conducted. The majority of the previous studies focus on the performance improvement of the base isolation systems. However, this study aims at cost and weight reduction of seismic base isolation pads by recycling otherwise useless material: scrap tires. Elastomer-based isolators have been heavily studied and used for the last 25 years. Steel or fiber reinforcement inside the elastomer isolators provides high vertical stiffness, whereas rubber segments between reinforcement layers provide low horizontal stiffness for the seismic base isolation. Since 1960̕s, automobile tires have been produced by means of vulcanizing rubber with steel mesh in different forms which have a similar effect as the steel plates or fibers inside the conventional elastomer-based isolators. Therefore, rectangular shaped layers cut from tread sections of used tires and then piled on top of each other can function as an elastomeric bearing. Since the tires are being designed for friction, load transfer between scrap tire layers would be large enough to keep all layers intact. A minimal slip generated between the piled layers at high strain rates may even help to dissipate some extra energy. Axial compression, dynamic free vibration, static shear and shaking table tests have been conducted on Scrap Tire Pads (STP) prepared by using different tire brands for different number of layers and orientations. The results have shown that the average shear modulus of STPs change between 0.9MPa and 1.85MPa. At the end of the dynamic tests it has been noticed that the lateral stiffness of STPs can be simply adjusted by changing the number of

Subject Keywords

Structural engineering.

URI

http://etd.lib.metu.edu.tr/upload/12607193/index.pdf
https://hdl.handle.net/11511/15875

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

3D-FE model field-calibration and rating studies on existing r/c buildings Demirok, Emel; Türer, Ahmet; Department of Civil Engineering (2006) Dynamic instrumentation and a series of ambient vibration tests were performed on a four storey strengthened R/C building within the scope of this study. Traffic load and wind load were accepted as natural dynamic loads and the vibrations were recorded by sensitive accelerometers.For that study, 12 uniaxial, 1 triaxial accelerometers and a 15 channel data logger system were used. Four sets of dynamic measurements were recorded over a period of 6 months. Recorded readings were analyzed using UPC, PC and CVA ...
Seismic roof isolation of Halkapinar Gymnasium Duran, Cihan Kurtuluş; Yılmaz, Çetin; Department of Civil Engineering (2007) In this study, seismic roof isolation solutions were investigated with a case study of Halkapınar Gymnasium, izmir. In the first part, seismic isolation was explanied and philosophy behind it was given. In the second part, existing seismic roof isolators, elastomeric bearing and viscous damper, were investigated with different support isolation combinations. In the third part, two more types of seismic isolators, lead rubber bearing and friction pendulum isolators, were also analyzed by using the same model...
Lateral load analysis of shear wall-frame structures Akış, Tolga; Tokdemir, Turgut; Department of Engineering Sciences (2004) The purpose of this study is to model and analyze the nonplanar shear wall assemblies of shear wall-frame structures. Two three dimensional models, for open and closed section shear wall assemblies, are developed. These models are based on conventional wide column analogy, in which a planar shear wall is replaced by an idealized frame structure consisting of a column and rigid beams located at floor levels. The rigid diaphragm floor assumption, which is widely used in the analysis of multistorey building st...
Correlation of deformation demands with ground motion intensity Yılmaz, Hazım; Yakut, Ahmet; Department of Civil Engineering (2007) A comprehensive study has been carried out to investigate the correlation between deformation demands of frame structures and a number of widely cited ground motion intensity parameters. Nonlinear response history analyses of single-degree-of-freedom (SDOF) and multi-degree-of-freedom (MDOF) models derived from sixteen reinforced concrete frames were carried out under a set of eighty ground motion records. The frames were selected to portray features of typical low-to-mid rise reinforced concrete structures...
Manufacturing and structural analysis of a lightweight sandwich composite UAV wing Turgut, Tahir; Kayran, Altan; Department of Aerospace Engineering (2007) This thesis work deals with manufacturing a lightweight composite unmanned aerial vehicle (UAV) wing, material characterization of the composites used in the UAV wing, and preliminary structural analysis of the UAV wing. Manufacturing is performed at the composite laboratory founded in the Department of Aerospace Engineering, and with hand lay-up and vacuum bagging method at room temperature the wing is produced. This study encloses the detailed manufacturing process of the UAV wing from the mold manufactur...

Citation Formats

B. Özden, “Low-cost seismic base isolation using scrap tire pads (stp),” M.S. - Master of Science, Middle East Technical University, 2006.