Master Degree / Yüksek Lisans Tezleri
Permanent URI for this collectionhttps://hdl.handle.net/11147/3008
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Master Thesis Evaluation of Effective Stiffness Procedures in Seismic Design of Reinforced Concrete Frames(01. Izmir Institute of Technology, 2021) Dönmez, Cemalettin; Dönmez, Cemalettin; 03.03. Department of Civil Engineering; 03. Faculty of Engineering; 01. Izmir Institute of TechnologyThis study investigates the success of the effective stiffness procedures defined for the design of reinforced concrete frames in seismic design regulations. The emphasis will be on the effort to model success relations. The origins of the effective stiffness approach could be identified in the effort to use the equal displacement rule for seismic design purposes. The equal displacement rules dictate that if a system's effective stiffness at the sustained drift levels could be identified, the linear and nonlinear system deflection demands are approximately equal. The nonlinear displacement response of a system could be obtained using this "estimated" stiffness value at the sustained displacement levels from the elastic analysis of the system. Hence, there is no consensus about defining the effective stiffness, and different approaches exist for its calculation. In this study, the effective stiffness approaches of the Turkish Earthquake Code (2018), Canadian Standards Association Design of Concrete Structures (CSA A.23.3-14), New Zealand Concrete Structures Standard (NZS3101-2006), Eurocode 8 (EN 1998-3), Building Code Requirement for Structural Concrete of American Concrete Institute (ACI318-19) and Sozen's Method are investigated in terms of effort in their execution to the success of the result. In order to provide a comparison in reference to measured values, the evaluation is based on the shaking table tests of a ten-story-three-bay reinforced concrete frame model. The numerical analysis is performed using the OpenSees platform. The model is formed by defining nonlinear rotational springs at the element ends. The effective stiffness definitions are performed per each regulation, and the results are compared with the test results. Also, a suite of ground motions is selected, and time history analyses are performed using each effective stiffness approach. Results are compared in terms of the maximum and envelope drift levels of the frames obtained by each approach.Master Thesis Dynamic Behavior of Reinfor Ced Concrete Frames With Infill Walls(Izmir Institute of Technology, 2011) Çankaya, Mehmet Alper; Dönmez, Cemalettin; Dönmez, Cemalettin; 03.03. Department of Civil Engineering; 03. Faculty of Engineering; 01. Izmir Institute of TechnologyCurrent practices utilize infill walls as insulation or partition material but not as a structural material. The main reason for this choice is the complexity of the partition wall-frame interaction behavior. Therefore infill walls typically ignored in the structural designs. However, existence of partition walls heavily effect stiffness, strength and behavior of structures. The main purpose of the presented study is the investigation of the dynamic parameters of reinforced concrete frames with and without infill walls. Moreover, lateral strength, stiffness and energy dissipation properties of the frames are also studied. In order to achieve the purpose four planar, one-bay, four story RC frames with 1/5 scale are designed, constructed and tested. In the frames main parameters are selected as presence of partition walls and ductile/non-ductile reinforcement detailing. Experiments are consisted of static and dynamic tests. In static tests each frame subjected to lateral loads that were applied at the each story level to provide a lateral loading increasing with height. Lateral load levels were controlled by the drift levels in the first story. Dynamic tests were performed at the end of each deformation level and modal analysis methods are utilized. Analyses have shown that existence of partition walls in the frame increased the natural frequencies of the frames. However, reinforcement detailing did not have a significant effect on natural frequencies. It is also observed that the natural frequencies of the frames decreased with increasing damage level. On the other hand, presence of partition walls effected the damaged behavior of the frames and drift is observed to concentrate to the first story with the increasing level of damage. And finally stiffness, strength and energy dissipation properties of frames with partition walls are observed to be dramatically higher than the frames without partition walls.