Master Degree / Yüksek Lisans Tezleri
Permanent URI for this collectionhttps://hdl.handle.net/11147/3008
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Master Thesis Assessment of the 2018 Turkish Seismic Regulations Unreinforced Masonry Construction Specifications Through a Case Study Structure(01. Izmir Institute of Technology, 2020) Turan, Egecan; Dönmez, Cemallettin; 01. Izmir Institute of TechnologyThe new release of the seismic regulation in 2018 resulted in major changes in masonry structures' design approach. It changes from the allowable stress design method to the ultimate strength design method. Also, the effect of vertical earthquake component, which was not considered, is included in the analysis combinations. The seismic risk is started to be defined by parameters determined according to the geographical coordinates of the building that is considered. The presented study is intended to investigate the impact of the listed changes on unreinforced masonry design. A case study building is utilized for this purpose. It is designed to satisfy the TER-2007 requirements and re-evaluated considering the TER-2018 requirements. The results show that the building did not have sufficient capacity, according to the 2018 earthquake regulation. Almost all the walls were beyond their capacities. The same structure has been analyzed by nonlinear static analysis (pushover analysis) as well. According to the nonlinear analysis results, performance assessment was made per the 2018 earthquake regulation and FEMA356. The performance evaluation by nonlinear static analysis using TER-2018 and FEMA356 demands, satisfies the life safety performance level for FEMA356 and TER-2018.Master Thesis Investigation of the Effect of Structural Grid Discontinuity on the Earthquake Behavior of Midrise Rc Moment Frames(Izmir Institute of Technology, 2019) Gemici Yormaz, Mefküre Banu; Dönmez, Cemallettin; 01. Izmir Institute of TechnologyReinforced concrete (RC) moment frames are the most common form among the building type structures in Turkey. The contemporary seismic design of building type structures evolves around the definition of deviations from an ideal structure that has a square-like floor plan, symmetric and uniform framing and mass distribution. These deviations are called the irregularities which are grouped in two as horizontal and vertical irregularities. There exists a horizontal irregularity that is not addressed in the current approach but it is needed to be investigated due to its possible impact on the lateral stiffness of the structure. It is the discontinuity of the horizontal grid in the structural frame. The purpose of this study is to investigate the earthquake response of the RC buildings that have horizontal grid discontinuities. It is intended to observe the level of additional vulnerability on the seismic response of RC moment frames due to this irregularity. Two 5-story reinforced concrete buildings are modeled in order to investigate the effects of the grid discontinuity phenomenon using nonlinear time-history analysis. The first building has discontinuous beams and framing that demonstrates the irregularity in the plan while the second one is the control case with uniform structural framing. The results are evaluated based on the member damage level. It is observed that the buildings with grid discontinuities are more vulnerable than those without irregularities to seismic excitation. Further study is needed to define a procedure to mitigate the vulnerability created by the horizontal grid discontinuity.