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Öğe Çelik çatılarda kafes kiriş ve aşık aralıklarının optimum tesbiti(Selçuk Üniversitesi Fen Bilimleri Enstitüsü, 1987) Sezer, Rifat; Karaduman, MustafaBu çalışmada çelik çatıların, kafes kiriş ve âşık aralıklarının optimum tespiti, sayısal optimizasyon metodlarından ve doğrudan araştırma tekniklerinden, "Patern Araştırma Metodu" kullanılarak araştırılmış ve bu amaçla bir bilgisayar programı geliştirilmiştir. tik bölümde optimizasyon ' konusuna ilişkin gerekli açıklamalar yapılmış; yapı optimizasyonunun amacı, yararı ve gerekliliği belirtilerek konunun gelecek için önemi vurgulanmıştır. Mevcut ye önemli optimizasyon metodlarından kısaca bahsedilerek, çelik çatıların optimizasyonuna uygunluklarına değinilmiştir. İkinci bölümde çelik çatılarda, ağırlık fonksiyonları ve sınırlayıcı şartlarının elde edilmesine ilişkin açıklamalar yapılmıştır. Üçüncü bölümde mevcut optimizasyon teknikleri ve bu tekniklerin çelik çatı sistemlerinin optimum boyutlandırılmasına uygulana bilirliği araştırılarak uygulamada sıkça kullanılan optimizasyon metodları incelenmiştir. Dördüncü bölümde Patern Araştırma Metodu ile çelik çatıların optimizasyonu üzerinde durulmuş ve bilgisayar programının tanıtımı yapılmıştır. Beşinci bölümde yapılan tez çalışmasında çelik çatıların optimizasyonu ile ilgili neticeler ele alınarak değerlendirmeler yapılmış ve farklı çatı kaplaması ağırlıklarına ve aşık türlerine göre bulunan sonuçlar karşılaştırılmıştır. Çalışmanın EKLER bölümünde ise; geliştirilen bilgisayar programlarının listesi ve örnek problemin iki iterasyon için bilgisayar çıktıları verilmiştir.Öğe The geometrical nonlinear analysis of the prismatic plane frames with the stiffness matrice method(ACADEMIC JOURNALS, 2010) Sezer, RifatIn this study, the geometrical non-linear analysis of the prismatic plane frames was researched with the stiffness matrice method by using the stability functions. First of all, having assumed the axial forces acting on the members as zero, the system was solved linearly under the initially set external loads, and the member axial forces were determined. The Stability Functions were calculated by using the obtained axial forces and the system was resolved under the same external loads. The operations were repeated for each iteration under the same external loads until the axial forces became constant. At the end of the iteration, the determinant and the eigenvalues of the system stiffness matrice, the system displacements and the axial forces of the members were determined. The external loads were regularly increased at the beginning of each iteration by multiplying them with a load factor of lambda, or the operations were continued until the least Eigenvalue became zero. Thus, at this stage, the critical load or buckling load of the system was found.Öğe Investigation of precast new diagonal concrete panels in strengthened the infilled reinforced concrete frames(KOREAN SOCIETY OF CIVIL ENGINEERS-KSCE, 2018) Aksoylu, Ceyhun; Sezer, RifatMajor part of the structural stock in Turkey doesn't have sufficient endurance, rigidity and ductility against possible large earthquakes. Strengthening of structures against earthquakes always appears on the agenda and structures are being strengthened by using different techniques. In this context, cast in place reinforced concrete shear walls is a highly effective and reliable method for improving the system behavior. However, construction work takes long time in this method, so the structure is required to be emptied before the practice. For this reason, it is required to develop the strengthening methods which facilitates lives of people and which is economic and effective in terms of structure. The principle of the technique recommended in this study is to convert plastered hollow brick walls of the structure to shear walls equivalent to reinforced concretes (RC) by strengthening them with high-strength precast new diagonal concrete panels. For this purpose, a reinforced concrete frame, which is 1/3 scaled, low-strengthened against earthquake, has two-story and single span unreinforced brick infilling wall, has been produced with failures frequently seen especially in concrete buildings of our country as reference sample. Moreover, strengthening three reinforced concrete infilled frame wall having same features with reference sample by new diagonal concrete panels which are precast, high strengths in different shapes used for the first time in the literature, their behaviors under reversible-repeatable horizontal loading simulating earthquake effect have been tested. Results of the experiment have been compared with the analytic study and it has been observed that applied technique has increased the energy dissipation capacity of test elements and improved the earthquake behaviors.Öğe STRENGTHENING AND SEISMIC PERFORMANCE IMPROVEMENT OF THE BUILDING OF CHAMBER OF ARCHITECTS IN AKSARAY (HISTORICAL IBRAHIM AGA MANSION)(INT SCIENTIFIC CONFERENCE SGEM, 2009) Sezer, Rifat; Yildiz, Mustafa; Dulgerler, O. Nuri; Kara, Nail; Dere, YunusThe historical Ibrahim Aga Mansion purchased by the Chamber of Architects of Aksaray and wished to be used as the service building for the chamber. In this study, the strengthening project before the restoration of the building was prepared. The building had no foundations under the stone walls and suffered from cracks and decaying of the wooden floors. Since the existing structural system did not allow restoration of the building, strengthening and redesign of the structural system was the main priority. In the retrofit project prepared, the exterior of the building is totally preserved, and the interior which had low load-carrying capacity and functionality is redesigned for more functionality and a new structural system made of reinforced concrete and steel members was proposed. The foundations were combined into a raft foundation, the basement walls were changed into shear walls, basement and ground floors designed as a reinforced concrete whereas the roof columns, beams and floors were designed as a steel system. The exterior walls and the interior structural system were anchored together in order to prevent possible settlements and deformations that may occur in the future. The prepared strengthening project has been put into practice and the construction work is still undergoing.Öğe A study on strengthening of reinforced concrete frames using precast concrete panels(KOREAN SOCIETY OF CIVIL ENGINEERS-KSCE, 2016) Akin, Arife; Sezer, RifatThis study describes the effectiveness of the behavior resulting from strengthening infill walls in existing reinforced concrete frame systems with low resistance against earthquake effects using precast concrete panels. In this study, a strengthening method that can be applied without building occupants having to leave the building was investigated. For this purpose, six 1/2 scale, two-story and single span test specimens with brick infill walls and low earthquake resistance, which have common errors seen in existing reinforced concrete buildings, were generated. The first of test frames with equivalent properties was tested as the reference specimen under reversible repeatable lateral loads. Others were tested after high-strength concrete panels produced in different geometric shapes were strengthened by bonding them onto existing frame infill walls. Brick infill walls strengthened using concrete panels were modeled as shell elements by SAP2000 software package and the accuracy of experimental studies were compared with analytical results. Experimental and analytical studies demonstrated that the reinforcement method significantly improved properties, such as resistance to lateral loads, energy dissipation capacity, of brick infill reinforced concrete frames.
