1,720,973 research outputs found
ANALYSIS OF SEISMIC PERFORMANCE OF EXISTING REINFORCED STRUCTURES
No full textBu çalışmada, Deprem Bölgelerinde Yapılacak Binalar Hakkında Yönetmelik (DBYBHY-2007) ve Eurocode 8 kullanılarak mevcut yapıların performans değerlendirmeleri yapılmıştır. Örnek olarak 4 ve 8 katlı iki adet betonarme bina ele alınmıştır. 8 katlı olan mevcut betonarme yapının performans değerlendirmesi, hem Deprem Bölgelerinde Yapılacak Binalar Hakkında Yönetmelik hem de Eurocode 8’de belirtilen şartlara göre doğrusal olmayan elastik yöntemlerden biri olan statik itme analizi yöntemi kullanılarak yapılmıştır. Ayrıca, 4 ve 8 katlı olan mevcut betonarme yapıların performans değerlendirmeleri, aynı ivme spektrumu uygulanarak her iki yönetmelik hükümleri uyarınca yapılmıştır. Analiz sonucunda elde edilen eleman hasar düzeyleri karşılaştırılmış ve yapı performansları her iki yönetmeliğe göre değerlendirilmiştir.In this study, the performances of existing reinforced structures are evaluated by using Turkish Seismic Code (TSC-2007) and Eurocode 8. Two samples of eight and four story reinforced structure are taken. The performance evaluation of eight story existing reinforced structure are made by using static pushover analysis method which is a nonlinear elastic method according to the conditions stated in both TSC-2007 and Eurocode 8. Also, the performance evaluations of eight and four story reinforced structure are made by applying same response spectrum both in accordance with provisions of two codes. The damage levels of elements obtained in analysis results are compared and the performances of existing reinforced structures are evaluated according to two codes.
EXPERIMANTAL INVESTIGATION of CONCRETE BEAMS REINFORCED WITH HYBRID BFRP/STEEL BARS
No full textAn experimental investigation of the hybrid reinforcement application on concrete beams, which are reinforced with Basalt FRP (Fiber Reinforced Polymer) and steel bars as longitudinal reinforcement, is presented in this study. By using the centric loading method, the behavior of produced hybrid reinforced concrete beams with GFRP/steel bars was observed and analyzed.
All tested models were created with rectangular cross section with the width of 200mm and the depth of 300mm. The beams are simple supported and have a span of 2800mm.
The main objective of this research is to investigate and to analyze the flexural behavior of concrete beams reinforced with BFRP bars. Also, the parameters as the type of material, the amount and the configuration of the rebars as longitudinal reinforcement were investigated as well
INFLUENCE OF BLAST FURNACE SLAG CONTENT ON THE SULFATE DURABILITY OF THE PERLITE BASED GEOPOLYMER MORTARS
No full textIn this study, the influence of blast furnace content on the magnesium sulfate resistance of the perlite geopolymer mortars was investigated. For the purpose, perlite was activated with 10M NaOH solution and blast furnace slag was replaced by perlite in three different proportions according to the CaO/SiO2 oxide ratio. The ultrasound pulse velocity, flexural strength (ffs) and compressive strength, water absorption, and magnesium sulfate durability of the geopolymer mortars were investigated. The test results indicated that the blast furnace slag improved the mechanical properties and the magnesium sulfate resistance of the perlite geopolymer mortars
ANALYTICAL INVESTIGATION OF CONCRETE BEAMS REINFORCED WITH HYBRID GFRP/STEEL BARS
No full textIn this study, an investigation of the hybrid reinforcement application on concrete beams, which are reinforced with Glass FRP (Fiber Reinforced Polymer) and steel bars as longitudinal reinforcement, is presented. By using ANSYS modelling software, five concrete beams were created as 3-D models to simulate the behavior of hybrid reinforced concrete beams with GFRP/steel bars.
All tested models were created with rectangular cross section with the width of 200mm and the depth of 300mm. The beams are simple supported and have a span of 2800mm.
The main objective of this research is to investigate and to analyze the flexural behavior of concrete beams reinforced with FRP bars. Furthermore, the parameters as the type of material, the amount and the configuration of the rebars as longitudinal reinforcement were investigated as well
EFFECT OF NAOH MOLARITIES ON STRENGTH PROPERTIES OF GROUND PERLITE-BASED GEOPOLYMER MORTARS
Full text linkGeopolymers are the eco-friendly binders derived from activation of alumina silicates such as fly ash and metakaolin with alkaline activators. Ground perlite, a volcanic alumina silicate, has a potential to be a precursor material for geopolymer production due to its high SiO2 content and amorphous form. This paper presents the investigation of geopolymer production with ground perlite and NaOH. For this purpose, mortar mixtures are prepared with four different NaOH solutions (3M, 6M, 9M and 12M). Mortar specimens with dimensions of 4*4*16 cm are taken from the mixtures and heat curing process is applied to the specimens after casting. The flexural and compressive strength tests are conducted on the mortar specimens at 7 and 28 days of curing. The test results showed that the flexural and compressive strengths of the ground perlite based geopolymer mortars are increased with the molarity of NaOH solution, significantly
Analysis of Rectangular Concrete Columns with Hybrid Frp-Steel Bars
No full textThis paper aims is to provide a clear panorama which leads to a better understanding of the axially loaded behaviour of hybrid rectangular reinforced concrete (RC) columns with different sections and amount area of longitudinal bars. This investigation is to compute the maximum axial load carrying capacity of FRP bar reinforced concrete columns under axial compression, the research is to find the contribution of the FRP longitudinal bars in concrete columns based on the ultimate tensile strength of FRP bars. This nonlinear finite element analytical research conducted three different sections 25/30, 25/40 and 25/50 cm with different amount area of steel and FRP bars
Prediction of Punching Shear Capacity of Two-Ways FRP Reinforced Concrete Slabs
Full text linkAn innovative solution to the corrosion problem is the use of fiber-reinforced polymer (FRP) as an alternative reinforcing material in concrete structures. In addition to the non corrodible nature of FRP materials, they also have a high strength-to-weight ratio that makes them attractive as reinforcement for concrete structures. Extensive research programs have been carried out to investigate the flexural behavior of concrete members reinforced with FRP reinforcement. On the other hand, the shear behavior of concrete members, especially punching shear of two-way slabs, reinforced with FRP bars has not yet been fully explored. The existing provisions for punching of slabs in most international design standards for reinforced concrete are based on tests of steel reinforced slabs. The elastic stiffness and bonding characteristics of FRP reinforcement are sufficiently different from those of steel to affect punching strength. In the present study, the equations of existing design standards for shear capacity of FRP reinforced concrete beams have been evaluated using the large database collected. The experimental punching shear strengths were compared with the available theoretical predictions, including the CSA S806 (CSA 2012), ACI-440.1R-15 (ACI 2015), BS 8110 (BSI 1997), JSCE (1997) a number of models proposed by some researchers in the literature. The existing design methods for FRP reinforced concrete slabs give conservative predictions for the specimens in the database. This paper also presents a simple yet improved model to calculate the punching shear capacity of FRPreinforced concrete slabs. The proposed model provides the accurate results in calculating the punching shear strengths of FRP-reinforced concrete slender slabs
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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