Bağ kiriş katkı oranının boşluklu perdelerin doğrusal olmayan davranışına etkisi

Coupled walls result from the need to provide openings in window or door locations. Besides, coupled wall systems are exceptional lateral load resisting systems that not only reduce the deformation demands of the building, but also extend the plastic deformation vertically. This dissertation investigates the dependency on the initial coupling ratio on the actual behavior of rectangular coupled wall systems. In addition, a comprehensive review of the mathematical modeling for diagonally reinforced concrete coupling beams is carried out in the state-of-the-art. First, a simple yet accurate macro modeling procedure for coupling beams was investigated through a compressive literature survey for capturing the nonlinear behavior properly. Further enhancement to existing models were proposed to have better accuracy in cyclic behaviors comparing to previously performed test results. In addition, the simplicity in the modeling was improved by eliminating the slip/extension rotation hinges. In the second part of this research, 8, 16 and 24-story prototype reinforced concrete coupled wall buildings located in a high seismic zone were numerically studied. Totally, nine coupled wall prototype structures with identical wall piers, having varying coupling ratio values and number of stories were designed. Elastic analyses using the response spectrum analysis procedure were utilized to establish initial proportions in the coupled wall system, and to determine the design forces and moments. Nonlinear static and dynamic analyses were also conducted to investigate the coupled wall behavior, adequacy of design, and alteration in the coupling beams' efficiency. An additional unique aspect of this work is about investigating the distribution of force demands between wall piers depending on the initial coupling ratio. The results of this study indicate that low coupled systems do not always satisfy the required performance targets under specific earthquake levels. Moreover, the coupling beams at high-degree coupled systems exhibit comparatively low ductile behavior with limited plastic deformations along elevation. Although linear analysis results show that the bending moment demands at identical wall piers are the same; this cannot be expected to be valid for nonlinear cases. As coupling beams alter the axial demand on wall piers, they also change their moment capacities. It was observed that the disparity in the moment demands becomes larger as the coupling ratio gets higher. Therefore, further recommendations have been provided on moment redistribution to be utilized during the linear analysis. Finally, the change in the coupling ratio as plastic deformations increase in the system has been investigated in this study. It was observed that the coupling ratio degradation rate seems more critical in the systems where low coupling ratio is selected initially.