Master Degree / Yüksek Lisans Tezleri
Permanent URI for this collectionhttps://hdl.handle.net/11147/3008
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Master Thesis Experimental Study of Sheet Pile Retaining Walls With Granulated Rubber Reinforced Backfill(01. Izmir Institute of Technology, 2021) Khlaif, Ali Hamid Khlaif; Ecemiş Zeren, NurhanEarth retaining structures such as retaining walls, bridge abutment, bulkhead, braced excavation, and mechanically stabilized walls play a critical role in many infrastructural projects and are often subjected to different loading conditions. Performance of retaining walls under static and dynamic loading conditions depends upon the type of backfill soil. According to the European tire and rubber manufacturers’ Association (ETRMA) report about the end-of-life tyers management in 2017, Turkey recovers 0% of scrap tires in the civil engineering, public works, and backfilling category. This study aims at describing the ability to use granulated rubber sand mix as a backfill material in earth retaining structures. Therefore, physical model tests were conducted to investigate the deformation characteristics and pressure distribution of granulated rubber-sand mixture backfill behind the sheet pile. At dry and saturated conditions, granulated rubber-sand mixture backfill areas were changed in the physical model tests. Granulated rubber showed promising results that reduced the stiffness and density and increased the shear strength when used with sand. 6%, 8%, 10%, 12, and 15% granulated rubber mixing ratios have been tested using coarse and fine granulated rubber. The optimum ratio was 10% of finely granulated rubber. The maximum dry density reduced by 3.1%, and the maximum shear strength increased by 6.1%. When the granulated rubber-sand mix was used as a backfill, it reduced the lateral earth pressure and increased the water seepage under the sheet pile. The sheet pile model with granulated rubber sand mix backfill showed higher strength than the clean sand model.Master Thesis Numerical and Experimental Investigation of Radial and Tree-Shaped Vascular Channels for Self-Cooling Structures(Izmir Institute of Technology, 2016) Yenigün, Onur; Çetkin, ErdalIn this study, we show experimentally and numerically how a plate which is subjected to a constant heat load can be kept under an allowable temperature limit. Vascular channels in which coolant fluid flows have been embedded in the plate. Three types of vascular channel designs were compared: radial, tree-shaped and their hybrid. The effects of channel design on the thermal performance for different volume fractions (the fluid volume over the solid volume) are documented. In addition, the effects of the number of channels on cooling performance have been documented. Changing the design from radial to tree-shaped designs decreases the order of pressure drop. Hence increase in the order of the convective heat transfer coefficient is achieved. However, tree-shaped designs do not bathe the entire domain. Therefore, additional channels were inserted at the uncooled regions (hybrid design). The best features of both radial and tree-shaped designs are combined in the hybrid of them: the flow resistances to the fluid and heat flow become almost as low as the tree-shaped and radials designs, respectively. Furthermore, this thesis shows how delaying the inlet of the coolant fluid for a given time interval affects the peak temperature. The effect of design on the maximum temperature shows that there should be an optimum design for a distinct set of boundary conditions, and this design should be varied as the boundary conditions change. This result is in accord with the constructal law, i.e. the shape should be varied in order to minimize resistances to the flows.