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The investigation of seismic performance of existing RC buildings with and without infill walls
Hakan Dilmac,Hakan Ulutas,Hamide Tekeli,Fuat Demir 사단법인 한국계산역학회 2018 Computers and Concrete, An International Journal Vol.22 No.5
One of the important factors is the infill walls in the change of the structural rigidity, ductility, dynamic and static characteristics of the structures. The infill walls are not generally included in numerical analysis of reinforced concrete (RC) structural system due to lack of suitable theory and the difficulty of calculating the recommended models. In seismic regions worldwide, the residential structures are generally RC buildings with infill wall. Therefore, understanding the contribution of the infill walls to seismic performance of buildings may have a vital importance. This paper investigates the effects of infill walls on seismic performance of the existing RC residential buildings by considering requirements of the Turkish Earthquake Code (TEC). Seismic performance levels of residential RC buildings with and without walls in high-hazard zones were determined according to the nonlinear procedure given in the code. Pushover curves were obtained by considering the effect of masonry infill walls on seismic performance of RC buildings. The analysis results showed that the infill walls beneficially effected to the rigidity, roof displacements and seismic performance of the building.
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Haşim Pihtili,Melih Ulutas 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.2
This study was conducted on mortar barrels, manufactured from different composite materials to replace the 120-mm mortar barrel, which is currently used in the defense industry. Kevlar/epoxy and glass/epoxy composite materials were used in the study. In this respect, the deformation, pressure, lifespan and flow analyses of the barrel were conducted and the mechanical and strength properties between two different composite mortar barrels were compared. The “SolidWorks” program was used in order to obtain a solid modeling. The resulting data were transferred to the ANSYS program for static and dynamic analyses and the necessary square mesh operations were performed and the results were transformed into graphics using the finite elements method.
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Two Variants of the Reciprocal Super Catalan Matrix
Kilic, Emrah,Omur, Nese,Koparal, Sibel,Ulutas, Yucel Turker Department of Mathematics 2016 Kyungpook mathematical journal Vol.56 No.2
In this paper, we define two kinds variants of the super Catalan matrix as well as their q-analoques. We give explicit expressions for LU-decompositions of these matrices and their inverses.
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Multilevel Noncontiguous Spinal Fractures: Surgical Approach towards Clinical Characteristics
Mehmet Seçer,Fatih Alagöz,Ozhan Uçkun,Oğuz Durmuş Karakoyun,Murat Ömer Ulutaş,Ömer Polat,Ergün Dağlıoğlu,Ali Dalgıç,Deniz Belen 대한척추외과학회 2015 Asian Spine Journal Vol.9 No.6
Study Design: The study retrospectively investigated 15 cases with multilevel noncontiguous spinal fractures (MNSF). Purpose: To clarify the evaluation of true diagnosis and to plane the surgical treatment. Overview of Literature: MNSF are defined as fractures of the vertebral column at more than one level. High-energy injuries caused MNSF, with an incidence ranging from 1.6% to 16.7%. MNSF may be misdiagnosed due to lack of detailed neurological and radiological examinations. Methods: Patients with metabolic, rheumatologic diseases and neoplasms were excluded. Despite the presence of a spinal fracture associated clearly with the clinical picture, all patients were scanned within spinal column by direct X-rays, computed tomography and magnetic resonance imaging. When there were ≥5 intact vertebrae between two fractured vertebral segments, each fracture region was managed with a separated stabilization. In cases with ≤4 intact segments between two fractured levels, both fractures were fixed with the same rod and screw system. Results: There were 32 vertebra fractures in 15 patients. Eleven (73.3%) patients were male and age ranged from 20 to 64 years (35.9±13.7 years). Eleven cases were the American Spinal Injury Association (ASIA) E, 3 were ASIA A, and one was ASIA D. Ten of the 15 (66.7%) patients returned to previous social status without additional deficit or morbidity. The remaining 5 (33.3%) patients had mild or moderate improvement after surgery. Conclusions: The spinal column should always be scanned to rule out a secondary or tertiary vertebra fracture in vertebral fractures associated with high-energy trauma. In MNSF, each fracture should be separately evaluated for decision of surgery and planned approach needs particular care. In MNSF with ≤4 intact vertebra in between, stabilization of one segment should prompt the involvement of the secondary fracture into the system.
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