Sürdürülebilir Yeşil Kampüs Koleksiyonu / Sustainable Green Campus Collection
Permanent URI for this collectionhttps://hdl.handle.net/11147/7755
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Master Thesis Evaluation of Behaviour Factors of Steel Moment Resisting Frames(Izmir Institute of Technology, 2019) Baran, İbrahim; Aktaş, Engin; Aktaş, Engin; Kanyılmaz, Alper; 03.03. Department of Civil Engineering; 03. Faculty of Engineering; 01. Izmir Institute of TechnologyBuilders of structures throughout the history of civilizations have been challenged with various threats. Earthquakes, which may be considered as the most critical challenge of the built environment have been one of the main concerns of builders at all times especially in regions with high earthquake risk. In this study, Response Modification Factor, (also known as ‘R’ or ‘q’ factor) which is used by seismic codes to determine force demand considering the ductile behaviour of the structure during the earthquake, has been analyzed. Steel frames (36 frames) with a different number of stories (3,6,9) and bays (3 to 8) were designed with normal ductility (18 frames) and high ductility (18 frames) moment resisting steel frames. The Turkish Building Earthquake Code-2018 (TBEC 2018) was followed for the seismic design process. All frames were assumed to be constructed in a region with the highest seismic demand defined in the web-based Hazard Map in TBEC 2018. The performance evaluation of the designed frames is completed using non-linear static analyses following FEMA, ATC-40 and NEHRP guidelines. The non-linear static analyses were implemented with SAP2000 v20.2 commercial software. Static pushover analysis as well as the capacity curve graph, known as the N2 method, has been obtained, and the position of the frame capacity in the spectral acceleration graph has been determined and presented visually. The results were summarized and the R factors obtained from these analyses were compared with the values given in the Turkish Building Earthquake Code.Master Thesis Hec Hms Hydrological Model Application Using Scs Curve Number and Soil Moisture Accounting: Case Study of Alaşehir Basin(Izmir Institute of Technology, 2019) Akdeğirmen, Özgün; Baba, Alper; Tayfur, Gökmen; Baba, Alper; Tayfur, Gökmen; 03.03. Department of Civil Engineering; 03. Faculty of Engineering; 01. Izmir Institute of TechnologyWater is known as source of life throughout mankind’s history. According to first records of written history; Sumerians and Akkadians used water for their inland transportation and irrigation systems. With first settlements, mankind’s dependency to water has been increased and became one of the most substantial natural resource in our modern age. Importance of this resource even more solidifies when we consider its property of being limited. With realization of global climate change in early 19th century; treat to this limited resource has been revealed. Approximately 68% of the freshwater on earth reserved in glaciers and icecaps and 30% is reserved in groundwater systems according to United States Geological Survey’s (USGS) studies. Owing to the quantity and less compromised to contaminants nature, majority of our freshwater needs met from groundwater. Although the importance of groundwater, its management have always been a challenge due to hard to quantify volumetric changings in aquifers. This study focused on creating a hydrological basin model to investigate volumetric recharge changings in groundwater system. Under scope of this study in an attempt to acquire groundwater recharge amounts; practicality of HEC-HMS hydrological modeling software has been investigated. A SCS Curve Number and Soil Moisture Accounting (SMA) loss methods has been chosen for HEC-HMS modeling application due to availability and accessibility of data that required for loss methods. After data collection from meteorological stations, core drill samples; both methods have been used in HEC-HMS simulation environment and their predictions have been compared. In the comparisons, it was determined that the SCS Curve Number method predicts higher flow potentials and groundwater infiltration amounts compared to the SMA method. Models foresee an average of 33.4 % of precipitation infiltrates into groundwater system.Master Thesis Project Plannig and Management Using Building Information Modeling (bim)(Izmir Institute of Technology, 2018) Politi, Ruti Ruth; Aktaş, Engin; İlal, Mustafa Emre; Aktaş, Engin; İlal, Mustafa Emre; 02.02. Department of Architecture; 03.03. Department of Civil Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology; 02. Faculty of ArchitectureToday, in construction practice, implementation of effective construction management techniques and tools is becoming essential, especially as the scale of the projects increases. Large scale projects pose a challenge to industry; as the number of tasks, parameters and constraints to be considered rises, interaction of these tasks and parameters increases the complexity, as well. While the search for techniques and tools for better coping with complexity will never end, Building Information Modeling (BIM) has recently emerged as an approach that achieves considerable improvement in efficiently handling complexity. BIM is able to provide a digital visualization of a building or structure in 3D. The necessary geometric data is modeled but more importantly all semantic data associated with the project (function of the element, material properties, construction details, schedules, etc.) is stored with the model. The intent is to have a single model of the project for all stakeholders over all phases of the project. In this study, the main challenges within the current practice of project management are analyzed and what BIM-based project management has to offer to those challenges have been discussed. The thesis explores how BIM method can be applied to project management and how information can be collected to build a BIM model. The advantages of BIM-based scheduling (4D), cost estimation (5D), sustainability (6D), facility management (7D) and structural analysis in the scope of project management is discussed. A case study is given to validate the use of the computer aided programs for nD BIM during the construction phase.Master Thesis Numerical Modeling the Flood Wave as a Result of Ürkmez Dam(Izmir Institute of Technology, 2018) Şahin, Gül Sümeyra; Tayfur, Gökmen; Tayfur, Gökmen; 03.03. Department of Civil Engineering; 03. Faculty of Engineering; 01. Izmir Institute of TechnologyDams are constructed to provide benefits to society, hydropower generation, including water supply management and flood control. However, floods caused by failure of a dam is quite catastrophic for lives, properties and environment. Flow models for dam break scenarios ensures crucial information about land use planning and risk managment to minimize flood losses. In this study, estimation of flood innundated areas caused by flood triggered by failure of Urkmez Dam in Izmir is carried out by using HEC-RAS onedimensional (1D) unsteady flow routing model (full Saint Venant equations) and two dimensional model (2D) (full Saint Venant equations or Diffusion wave equations). The experimental distorted physical model provides controlling to simulations. The aim of the paper is to assess the risk of a dam failure potential by comparing performances of 1D and 2D simulations. Two models were compared considering the required data, data preparation, inundated area, flood velocity, flood depth, and flood waves.Master Thesis Modal Parameter Identification of Civil Engineering Structures by Using an Output-Only System Identification Technique(Izmir Institute of Technology, 2015) Ceylan, Hasan; Turan, Gürsoy; Turan, Gürsoy; 03.03. Department of Civil Engineering; 03. Faculty of Engineering; 01. Izmir Institute of TechnologyCivil engineering structures are designed for a limited lifetime. Due to environmental effects and degradation of these structures, engineers need to decide on their structural safety and sustainability from time to time. To this end, structural health monitoring techniques could be employed to determine the current structural state. Current conditions of structures could be investigated by system identification techniques that is based on the modal parameters (modal frequencies, modal damping ratios and mode shapes) of structures. In this thesis, output-only system identification of civil structures is studied to estimate modal parameters of two different types of structures. For this purpose, a combination of the Natural Excitation Technique (NExT) and the Eigensystem Realization Algorithm (ERA) is coded within Matlab environment. The first study consists of a numerical and an experimental phase. In the numerical phase, the technique is implemented on the mathematical model of a three-story model building. In the experimental phase, it is implemented on the physical model of this three-story model building. 10 different scenarios of structural conditions are simulated by means of changes in story masses of the structure. By using NExT-ERA, the calculated modal frequencies and mode shapes are in good agreement with the results of the eigenvalue analysis. Further, the simulated mass change in each scenario is detected by a least squares approach. Changes in story masses are detected within reasonable errors. In the second study, a methodology is proposed to acquire measurements of large structures by using a few sensors, only. These sensors are used in a segmental way to measure the whole structure. The sensors are grouped and the groups of sensors are shifted on the model to obtain the response measurements from the whole structure. Then the grouped response measurements that are obtained at different time frames are transformed into the equivalent response data as if being acquired at a single time interval. To implement the methodology, a finite element model of a continuous beam bridge is constructed. Modal parameters of the model are estimated by using NExT-ERA and the results show that the first 10 modal frequencies are consistent with those of the eigenvalue analysis of the model, but only the first 6 mode shapes are successfully identified.Master Thesis Construction and Control of a Desktop Earthquake Simulator(Izmir Institute of Technology, 2006) Kınay, Gökçe; Turan, Gürsoy; Turan, Gürsoy; 03.03. Department of Civil Engineering; 03. Faculty of Engineering; 01. Izmir Institute of TechnologyA portable, servo motor driven, and single-degree-of freedom earthquake simulator is manufactured. The moving table has a dimension of 40 cm x 40 cm. It can carry a load of 80 kg, accelerated to 2 g (1 g @ 9.81 m/s 2 ). Its maximum displacement capacity is ± 7 cm. In order to obtain the desired motion, a voltage of .10 to +10 volts is applied to the servo unit (motor driver), which is adjusted to move the table at .25 cm/s and 25 cm/s, respectively. A runtime program is written to read an earthquake's velocity-time data and to produce an electrical voltage that takes care of the following two items: First, the maximum speed of the simulated earthquake can not be larger than the motor.s capacity. Second, the maximum earthquake displacement can not be larger than the table.s displacement capacity.In the present work, the recorded strong motion acceleration time series are processed in order to obtain useful data for engineering analysis. Strong motion accelerogram processing (earthquake data processing) is performed in Scilab. The objectives of strong motion data processing are corrections for the response of the strong motion instrument itself, and reduction of random noise in the recorded signals. The processing concentrates on the lowfrequency ranges of the usable signal in the records.The results obtained from comparison of the present work's outputs and some data providers' outputs are satisfactory. Some slight differences exist due to the different integration schemes and due to the application of different filter orders, zero-padding, and different filters for instance, acausal or causal Butterworth filter.The simulations are performed in a regular Linux environment and also in a Realtime Linux environment. The advantage of the realtime environment ensures the signals send to the servo driver to be on-time . no delay due to operating system tasks.