Tolga Y. Ozudogru

Tolga Y. Ozudogru
Istanbul Technical University · Department of Civil Engineering

Ph.D. M.ASCE

About

23
Publications
18,109
Reads
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529
Citations
Additional affiliations
November 2011 - May 2014
Virginia Polytechnic Institute and State University
Position
  • Researcher
December 2005 - present
Istanbul Technical University
Position
  • Research Assistant
Education
September 2007 - September 2015
Istanbul Technical University
Field of study
  • Civil Engineering/Geotechnical Engineering
September 2004 - September 2007
Istanbul Technical University
Field of study
  • Civil Engineering/Geotechnical Engineering
September 2000 - June 2014
Istanbul Technical University
Field of study
  • Civil Engineering

Publications

Publications (23)
Article
Full-text available
This letter shows that the increase of heat exchanger pile capacity in response to heating, observed in several small-scale laboratory studies, cannot be directly attributed to the increase of contact pressure at the soil–pile interface. The main thermo-hydro-mechanical processes that influence the capacity and behaviour of heat exchanger piles inc...
Article
Full-text available
In most analytical and numerical models of heat exchanger piles, strain incompatibilities between the soil and the pile are neglected, and axial stresses imposed by temperature changes within the pile are attributed to the thermal elongation and shortening of the pile. These models incorporate thermo-hydro-mechanical couplings in the soil and withi...
Article
Full-text available
Heat exchanger piles utilize the constant temperature and the thermal storage capacity of the ground for heating and cooling of buildings. Sustainable use of the ground as a renewable energy source depends on the seasonal energy load balance. One of the critical factors for the sustainable operation of heat exchanger piles is that a constant temper...
Conference Paper
Many offshore energy production and recovery structures such as wind turbines, offshore tidal turbines, and oil/gas platforms are built on carbonate sands, which predominantly consist of the skeletal remains of marine organisms. Particles of carbonate sands have highly porous grain structures with intra-granular voids. Such porous grain structure r...
Conference Paper
Full-text available
Ground-source heat pump systems consist of heat exchanger boreholes, embedded with circulation pipes, buried in the ground and connected to a heat pump for heating and cooling of buildings. Due to the changes in seasonal energy demands of the building, sustainability of borehole heat exchangers depends on the seasonal load balance. As the soil can...
Conference Paper
Full-text available
Zemin kesitinde yer alan tabakaların dinamik davranış özellikleri, depremler sırasında yapısal hasarı belirleyen önemli faktörlerden birisidir. Bu nedenle depreme dayanıklı yapı tasarımında deprem kaynak ve yapı özelliklerinin yanında yerel zemin koşullarının ve dinamik davranış özelliklerinin bilinmesi gerekmektedir. Zemin yapı ilişkisini inceleme...
Article
Full-text available
This paper presents the non-uniform thermally induced strains and stresses that develop in the cross-sections of energy piles when subjected to operational energy demands. The thermal operation of energy piles depends on the thermal demands of the supported building. These thermal demands vary seasonally, daily and even hourly, which generates non-...
Technical Report
Full-text available
In this study, the authors investigated the feasibility of a ground-coupled system that utilizes heat energy harvested from the ground for deicing of bridge decks. Heat exchange is performed using circulation loops integrated into the deep foundations supporting the bridge or embedded within the approach embankment. The warm fluid extracted from th...
Article
Full-text available
This paper presents the development of a 2D finite difference modelling approach and a 3D finite element numerical model for simulating vertical geothermal heat exchangers (GHEs), explaining the theory governing the thermal processes, element discretization and the selection of the appropriate boundary conditions. Both of these models provide fully...
Conference Paper
Full-text available
Heat exchange capacity of an Energy Pile is a key parameter in the design of these elements as ground sourced heat exchangers. In most cases, field thermal conductivity tests are necessary to verify design assumptions similar to running a conventional pile load test to prove pile capacity. Current standards for measuring the heat exchange performan...
Conference Paper
Full-text available
Highways are the most common and the most advanced means of transport compared to other transportation systems in Turkey. The embankment, subbase, base and pavement materials are provided from borrowed pits in traditional construction. During construction process; excavation, loading and transporta- tion costs of the material are the most important...
Book
Low strain pile integrity testing which utilizes one dimensional wave propagation theory makes it possible to detect major discontinuities or defects (cavities, cracks, decrease and increase in cross-section) within a pile quickly and economically. In this study, pile integrity testing data of 187 piles in two close sites located in Buyukcekmece, I...
Article
Full-text available
Bu araştırma, kazıkların imalat kalitesini belirleme yöntemlerini incelemekte ve uygulamadan iki örnek içermektedir. Araştırmanın birinci kısmında düşük deformasyonlu kazık süreklilik deneyi ile kazıklarda meydana gelen süreksizlikler ve imalat hataları ele alınmıştır. Burada bir arazideki 96 kazıkta uygulanan kazık süreklilik deneyi verileri değer...
Conference Paper
Full-text available
Low strain pile integrity testing which utilizes one dimensional wave propagation theory makes it possible to detect major discontinuities or defects (cavities, cracks, decrease and increase in cross- section) within a pile quickly and economically. In this study, pile integrity testing data of 96 piles in a site located in Büyükçekmece are analyze...
Conference Paper
Full-text available
Low strain pile integrity testing which utilizes one dimensional wave propagation theory makes it possible to detect major discontinuities or defects (cavities, cracks, decrease and increase in cross-section) within a pile quickly and economically. As the test data reflect the change in impedance, possible imped11ance diversity due to soil conditio...
Conference Paper
Full-text available
Killi zeminlerin konsolidasyon davranışı ve gerilme geçmişinin belirlenmesi açısından, önkonsolidasyon basıncının saptanması önem taşımaktadır. Bilindiği gibi kohezyonlu zeminlerde önkonsolidasyon basıncından daha düşük veya daha yüksek değerlerde mukavemet ve sıkışma davranışları farklılık göstermektedir. Bu nedenle, önkonsolidasyon basıncının has...
Conference Paper
Full-text available
This paper represents the results of various oedometer tests by using different size of samples to compare the pre-consolidation pressure. Pre-consolidation pressure is very important parameter that shows the stress history and the consolidation behavior of cohesive soils. In this research, five different types of high plasticity clay subgrades wer...
Conference Paper
Full-text available
The pre-consolidation pressure is an important parameter for the stress history and the consolidation behavior of cohesive soils. This paper presents the evaluation of oedometer test results of several clay samples (CL and CH) in terms of the Unified Soil Classification System. Almost 30 soil samples were considerably selected, which had been taken...
Conference Paper
Full-text available
The pre-consolidation pressure is a considerable parameter for the stress history of consolidation behavior of cohesive soils. This part of the main research embodies the results of various oedometer tests applied on several low plasticity clay samples according to the Unified Soil Classification System with a constant diameter size of 50mm. In ord...

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Projects

Projects (2)
Archived project
One dimensional wave propagation theory in media forms a theoretical background for engineering applications. In engineering, non-destructive testing methods are employed based on this theory. In geotechnical engineering in the same manner the developed test methods based on mechanical wave propagation theory in a rigid body is applied to the pile foundation systems. This method makes it possible to detect major discontinuities or defaults within a pile quickly and economically as concrete piles are constructed. In this study, pile integrity test which is a non-destructive testing method and sometimes is also referred to as the sonic integrity test will be applied. In this method, with light hammer impacts low strains is applied to the foundation element and reflections within the concrete pile are analyzed. Collected force and velocity records at the end of the test are evaluated and informations related to the construction quality of the pile is obtained. In the scope of this study, after obtaining the necessary theoretical knowledge and practical information about the testing equipment, the test will be performed on pile systems in different construction sites and the collected test results will be evaluated with the computer based programs. If results of other methods analyzing the pile response like core drilling, inspection by excavation and plate load test are available, then non-destructive test method results can also be compared with those test data.
Archived project
The main intellectual merit is that, this university-industry collaboration will answer key questions about long-term thermo-mechanical and Energy Pile group performance, and provide new industry design guidelines and field testing procedures. In terms of broader impact, the work would help promote the use of Energy Pile technology in the United States, and thereby help reduce fossil fuel consumption, lower greenhouse gas emissions, lower the cost of heating and air conditioning, and decrease our reliance on foreign energy.