Master Degree / Yüksek Lisans Tezleri
Permanent URI for this collectionhttps://hdl.handle.net/11147/3008
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Master Thesis Optimization of Isolators Between Floors of a High-Rise Building(01. Izmir Institute of Technology, 2024) Sönmez, Berkan; Turan, Gürsoy; Turan, Gürsoy; 03.03. Department of Civil Engineering; 03. Faculty of Engineering; 01. Izmir Institute of TechnologyEarthquake vibrations are natural phenomena that can cause tremors on the ground surface and lead to serious loss of life and property. Especially large-scale earthquakes have the potential to significantly damage infrastructure systems and the durability of structures. Several strategies are available to reduce these damages and increase the resistance of structures to earthquakes. One of these strategies is the implementation of seismic isolators. Seismic isolation minimizes earthquake damage to structures. The main purpose of the study is to examine the effectiveness of the seismic isolator being installed at various story levels of 3D 20-story steel building model. The building had two sets of 20 evaluation models, each with a different isolator story. The first set had identical evaluation models, except for the isolation story which is incremented in each model. The second set is similar to the first set except that the lower stories are strengthened by shear walls. The goal was to determine the best dimensions for the isolator to minimize the inter-story drift values. For this purpose, a set of 12 earthquake records are selected. These records are scaled according to the determined design spectrum. The optimization is performed for one of these earthquake records. Nonlinear dynamic analyses are carried out to evaluate the building model responses for all 12 earthquake records. Response values such as story shear forces and story drift ratios were analyzed and interpreted. This analysis will contribute to a better understanding of the impact of isolators with optimization methods on structural performance.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.