Gotowe bibliografie tematyczne / One-way slabs

Gotowa bibliografia na temat „One-way slabs”

Autor: Grafiati
Data publikacji: 4 czerwca 2021
Data aktualizacji: 20 lutego 2023

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Artykuły w czasopismach na temat "One-way slabs"

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Yaagoob, Ali H., i Ibrahem S. Harba. "Behavior of Self Compacting Reinforced Concrete One Way Bubble Deck Slab". Al-Nahrain Journal for Engineering Sciences 23, nr 1 (20.03.2020): 1–11. http://dx.doi.org/10.29194/njes.23010001.

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Reinforced concrete slab with plastic voids (Bubbled Deck system) is a new type of slabs which has two-dimensional arrangement of voids within the slab that is developed to decrease the slab self-weight while maintaining approximately the same load carrying capacity as compared with the solid slabs. Plastic voided slabs have the ability to reduce concrete amount by about 30 percent and this reduction is so important in terms of cost saving and enhancement the structural performance. In this research paper investigation is carried out to study the shear strength behavior of one-way bubble deck slab using self-compacting reinforced concrete. The experimental program consists of testing thirteen one-way slabs with dimensions of (1700 length, 700 width and 150 thick) mm. One of the tested slabs is a solid slab (without balls) is used as a reference, the remaining twelve bubbled slabs with ball diameter (73, 60) mm are divided into five groups according to the parameters of the experimental work, the parameters of the experimental work include: type of slab (bubble and solid slabs), ball diameter (73, 60) mm, shear reinforcement and spacing between balls. The experimental results showed that the bubbled slabs without shear reinforcement have a decrease in the ultimate load as compared to solid slab by about 3.7% to 14.3% and an increase in the deflection at ultimate load by about 10% to 22%, at the same time the first crack load decreases by about 15.3% to 42.4% as compared to solid slab due to decreases of moment of inertia of bubble slab compared to solid slab. Also, the results showed that the bubbled slabs withe shear reinforcement (multi-leg) have an increase in the ultimate load as compared to solid slab by about 35.4% to 57.3% and an increase in the deflection at ultimate load by about 1% to 15%, at the same time the first crack load decreases by about 2.8% to 27.4% as compared to solid slab.
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Al-Ahmed, Ali Hussein Ali, Falah Hasan Ibrahim, Abbas AbdulMajeed Allawi i Ayman El-Zohairy. "Behavior of One-Way Reinforced Concrete Slabs with Polystyrene Embedded Arched Blocks". Buildings 12, nr 3 (10.03.2022): 331. http://dx.doi.org/10.3390/buildings12030331.

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This study presents experimental and numerical investigations on seven one-way, reinforced concrete (RC) slabs with a new technique of slab weight reduction using polystyrene-embedded arched blocks (PEABs). All slabs had the same dimensions, steel reinforcement, and concrete compressive strength. One of these slabs was a solid slab, which was taken as a control slab, while the other six slabs were cast with PEABs. The main variables were the ratio of the length of the PEABs to the length of the slab (lp/L) and the ratio of the height of the PEABs to the total slab depth (hP/H). The minimum decrease in the ultimate load capacity was about 6% with a minimum reduction in the slab weight of 15%. In contrast, the maximum decrease in the ultimate load capacity was about 24% with a maximum reduction in the slab weight of 40%. Moreover, the mode of failure changed from flexure to shear failure, especially for those slabs with an lP/L ratio equal to one. The geometric and material non-linearity was adopted in the proposed finite element (FE) model to simulate the slabs with PEABs using Abaqus software. Good agreement was obtained between the developed FE and experimental results.
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Kim, Byoung Hoon, Joo Hong Chung, Hyun Ki Choi, Seung Chang Lee i Chang Sik Choi. "Flexural Capacities of One-Way Hollow Slab with Donut Type Hollow Sphere". Key Engineering Materials 452-453 (listopad 2010): 773–76. http://dx.doi.org/10.4028/www.scientific.net/kem.452-453.773.

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This paper presents the flexural capacities of one-way hollow slab with donut type hollow sphere. Recently, various types of slab systems which can reduce self-weight of slabs have been studied as the height and width of building structures rapidly increase. A biaxial hollow slab system is widely known as one of the effective slab system which can reduce self-weight of slab. A biaxial hollow slab has hollow spheres within slabs in order to reduce self-weight of slabs. The capacities of biaxial hollow slab are influenced by the shapes, volume and materials of hollow spheres. According to analytical studies, the hollow slab with donut type hollow sphere had good flexural capacities such as strength, stiffness and deflection. To verify the flexural capacities of this hollow slab, flexural tests were performed on the one-way hollow slabs. Five test specimens were used for test parameters. One was conventional RC slab and others were hollow slabs. The test parameters included two different shapes and materials of plastic balls. The shape parameters were donut and non-donut forms. And the material parameters were general plastic and glass fiber plastic.
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M. Ibrahim, Amer. "Effect of Construction Type on Structural Behaviour of R.C Bubbled One-Way Slab". DJES 12, nr 1 (1.03.2019): 73–79. http://dx.doi.org/10.24237/djes.2019.12109.

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Using Bubbles in the slab is a revolutionary method of eliminating concrete from the middle of conventional slab as this concrete does not perform any structural function, thereby dramatically reducing structural dead weight. This research presents experimental study to investigate the effect of construction type on the strength and behaviour of bubbled one-way slabs. The experimental program consists of testing four slabs with dimensions of 1850mm×460mm×110 mm. One1of the tested slabs was conventional slab (without bubbles), two bubbled slabs with different types of construction (simple and filigree bubbled slabs) and the remaining one is filigree bubbled slab strengthened with steel cage. The bubbles were made of recycled plastic balls. The experimental results show that the stiffness reduction factor for all the bubbled slabs was (0.87), this leads to decrease the ultimate strength of bubbled slabs and to be smaller than that of the solid slab by 4.4% 69% and 1.7% respectively. Also an increase in deflection at yield load (∆y) by about (10% to 12%), at the same time the crack load is found to be decreased by (13% to 40%). The simple bubbled slab is more efficient when compared with filigree bubbled slab. Also the results show that the use of steel cage in filigree bubbled slab gives an increase in the ultimate load by 69% and an increase in the ultimate deflection by about 77% when compared with filigree bubbled slab without steel cage.
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Abtan, Yaarub G., i Hassan Falah Hassan. "Flexural Strength of Modified Reactive Powder Concrete One Way Slabs". Open Civil Engineering Journal 13, nr 1 (31.12.2019): 260–70. http://dx.doi.org/10.2174/1874149501913010260.

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Background: Over the last three decades, the interest in using advanced high-performance materials in the construction industry has been increasing worldwide. Recently, a very high strength cement-based composite with high ductility called Reactive Powder Concrete (RPC) has been developed. The RPC concept is based on the principle that a material with a minimum of defects such as micro-cracks and voids will be able to achieve greater load-carrying capacity and durability. Methods: In the present paper, an experimental program of sixteen reinforced concrete one-way slabs was conducted to investigate their behavior under flexural loading. Four of these slabs were with Normal Concrete (NC) and the others of Modified Reactive Powder Concrete (MRPC). All slabs were identical in the dimension of its length and width (1000×500) mm, respectively, and its thickness was varied as one of the variables used in the present work. Other parameters for a one-way slab are concrete type, steel fibers content and flexural steel reinforcement ratio (0.33 and 0.66)%. Results: The results showed that the MRPC slabs with steel fibers failed in a ductile manner and had ultimate load capacity more than that of non-fibrous MRPC with an improvement percentage that reaches up to (66) %. This percentage became (212) % in comparison with normal concrete slabs. Conclusions: Moreover, the results showed that slabs, for both concrete types, reinforced with lower steel ratio failed by tension mode, otherwise, the slabs of higher reinforcement steel ratio failed by combined tension-shear mode. However, an improvement was observed in the ultimate load capacity up to (53 and 98) % when the ratio of steel reinforcement and slab thickness increased, respectively.
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Yaseen, Aws N., i Ali H. Ali Al-Ahmed. "Behaviour of One-Way Reinforcement Concrete Cantilever Slabs with Circle Openings". E3S Web of Conferences 318 (2021): 03014. http://dx.doi.org/10.1051/e3sconf/202131803014.

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Sometimes there is in need to make openings in the slabs, and this greatly effects on the strength of the structural element. Therefore, this research studies the behaviour of one-way reinforcement concrete cantilever slabs and the extent of their effect and resistance. The number of openings, their location and sizes are the main parameters that have been studied. A comparison was made between four slabs with openings and a fifth reference model (solid slab). After conducting laboratory tests, differences were found in their behaviour and resistance. The decrease in the ultimate load reached 31.5%, while the deflection rate was a decrease between 3.2% and 62.7%. It was also found that the location and number of openings affected the behaviour of the slab.
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Zaman Khan, Qaiser uz, Afaq Ahmad, Ali Raza, Mojtaba Labibzadeh i Muhammad Iqbal. "Structural Performance of One-Way Slabs Reinforced with Steel and Polypropylene Fibers". Jurnal Kejuruteraan 33, nr 2 (30.05.2021): 193–203. http://dx.doi.org/10.17576/jkukm-2021-33(2)-04.

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The present study aims to investigate the effects of the steel fibers (SF) and polypropylene fibers (PPF) on the structural response of one-way simply supported reinforced concrete (RC) slabs at the ultimate limit state (ULS). Next, an optimized combination of the hybrid fibers is proposed. The experimental program includes 21 experiments on the one-way slabs with different SF and PPF ratios. The load-deflection curves were obtained for slabs using a four-point bending method. The ultimate capacity and mid-span deflection of the slabs were measured. The experimental results did not produce a consistent trend of ultimate loading. The different blends produced different failure modes, cracking load, and ultimate failure load. Based on the obtained test results, the slab specimen, SM6, with 0.7% SF and 0.9% PPF ratios has the maximum and the slab specimen, SM16, with 0.9% SF and 0.9% PPF ratios has the minimum load-carrying capacity, respectively. The first shows a 31% increase and the second indicates a 31% reduction when compared to the reference slab specimen, SM1, which has no fibers used in its concrete mixture. It is worth to mention that the slab specimen, SM6, which has the largest load-carrying capacity, also shows the highest ductility (172% enlargement in deflection when compared to the reference slab, SM1).
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Xie, Jian Jun, Jun Lin Tao, Song Gu, Ting Lei i Wen Jun Hu. "Experimental Research on Flexural Behavior of Recycled Concrete One-Way Slab Reinforced with CFRP". Advanced Materials Research 261-263 (maj 2011): 120–24. http://dx.doi.org/10.4028/www.scientific.net/amr.261-263.120.

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This paper is supported by National 863 Plans Projects and Sub-project of Science and Technology Department of Sichuan Province, through experimental research on flexural behavior of non-crack recycled concrete one-way slabs reinforced with CFRP, research the ultimate bearing capacity and maximum deflection of it, and comparative analysis the results with recycled concrete one-way slabs which is not been reinforced and reinforced with CFRP after post-cracking. The results show that, the ultimate bearing capacity is higher than the non-crack reinforced concrete slabs, at the same time the deflection is smaller. The ultimate bearing capacity of non-crack recycled concrete one-way slab reinforced with CFRP is lower than post-cracking recycled concrete one-way slab reinforced with CFRP, at the same time the deflection is greater. But found bearing capacity and deflection is lower than that post-cracking recycled concrete one-way slab reinforced with CFRP when experimental on flexural behavior of non-crack recycled concrete one-way slabs reinforced with CFRP, and do a preliminary analysis for this phenomenon.
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Yaseen, Aws Nabeel, i Ali Hussein Ali Al-Ahmed. "Behaviour of One-Way Reinforcement Concrete Cantilever Slabs with Openings". IOP Conference Series: Earth and Environmental Science 961, nr 1 (1.01.2022): 012043. http://dx.doi.org/10.1088/1755-1315/961/1/012043.

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Abstract In some concrete structures, openings are placed because of the need for several utility requirements. These openings could affect the strength of the structural members. So the behavior of reinforcement concrete (RC) cantilever slab containing openings and its effect is the subject of the study. Opening shapes, numbers and sizes are the main variables that have been studied in this research. Five RC cantilever slabs were cast and tested; one is without openings and the other four slabs are with openings. It is found that there is a significant effect of openings on the behavior of these slabs. Where, the decrease in the ultimate load (from 39kN to 24.7kN), while the decrease in the deflection at ultimate load (from 67 mm to 35 mm).
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Ibrahim, Nehal, Mohammed A. Kabosh i Amged O. Abdelatif. "Modeling Deflection in Reinforced Concrete One-way Slabs using Eurocode2 Model". FES Journal of Engineering Sciences 9, nr 1 (22.02.2021): 91–95. http://dx.doi.org/10.52981/fjes.v9i1.664.

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This paper examines the validity of Euro code (EC2) method for modeling deflection in reinforced concrete one-way slabs. A numerical model which incorporates nonlinear effect due to cracking has been developed. A MATLAB program has been developed to implement the model. The performance of the model has been validated against experimental results in literature. The results show that the model is capable of predicting the deflection of simply supported reinforced concrete one- way slabs. A parametric study has then been carried out to quantify the influence of relevant parameters on slabs deflection. It has been found that most significant factor affecting deflection is the slab thickness.
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Rozprawy doktorskie na temat "One-way slabs"

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Miltenburg, Roger J. "Membrane behaviour in one-way prestressed concrete slabs". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0007/MQ30752.pdf.

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Abdul-Salam, Bahira. "Behaviour of shear critical frp reinforced concrete one-way slabs". Thèse, Université de Sherbrooke, 2014. http://savoirs.usherbrooke.ca/handle/11143/5352.

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Résumé : Les dalles de tabliers de ponts et des stationnements sont exposées à des environnements agressifs en particulier au Québec et en Amérique du Nord en raison de l'utilisation de sels de déglaçage et des cycles de gel-dégel. La substitution des armatures d’acier par des armatures en matériaux composites de polymères renforcés de fibres (PRF) constitue une alternative intéressante qui connait beaucoup de succès ces dernières années. Le béton armé de PRF est durable, car l’armature n’est pas sujette à la corrosion électrochimique. Aussi l’armature de PRF possède une résistance en traction élevée et est légère. En Amérique du Nord, l’utilisation des composites de PRF a suscité une attention toute particulière de la part des ingénieurs et des gestionnaires d’ouvrages. Plusieurs organismes dont des ministères de transport spécifient l’armature de PRF comme matériau structural dans leurs devis techniques pour lutter contre la corrosion et allonger la durée de service de leurs infrastructures. Les dalles en béton armé sont souvent soumises à des efforts de cisaillement critiques. Actuellement les méthodes de calcul au cisaillement (à l’effort tranchant) de dalles unidirectionnelles en béton armé de PRF différèrent d’une norme à une autre. En effet, la majorité des équations proposées dans les normes et guides de conception ont dérivées à partir de relations empiriques. Bien que des efforts de recherche considérables aient été consacrés dans ce domaine au cours de la dernière décennie, une meilleure compréhension du comportement au cisaillement et des mécanismes de rupture de dalles unidirectionnelles en béton armé de PRF est encore nécessaire. Dans cette recherche, un programme expérimental visant à étudier le comportement de dalles renforcées avec différents types de barres en PRF a été mis en place. Vingt-deux dalles unidirectionnelles en béton renforcées avec des barres de PRF ont été construites et testées en flexion a quatre points jusqu’à la rupture. Les paramètres d’étude comprennent : le type et le taux d’armature, le diamètre de la barre, l’espacement et la configuration de l’armature ainsi que la résistance en compression du béton afin d’examiner leur effet sur la résistance au cisaillement des dalles. Le comportement des dalles testées a été examiné en considérant le réseau de fissures, la charge ultime ainsi que les modes de rupture. Aussi, une base de données comprenant 203 poutres et dalles unidirectionnelles en béton armé de PRF rompues en cisaillement a été répertoriée et introduite dans les analyses. Les charges de rupture en cisaillement des dalles testées dans le cadre de cette thèse ainsi que celles de la base de données ont été comparées à celles prédites par les équations de calcul proposées par la normes canadiennes CSA S6-06/S1 et CSA S806-12, ainsi que celles des deux guides de calcul ACI 440.1R-06 et JSCE-97. Les analyses effectuées ont montré que les valeurs prédites par les équations de calcul proposées par l’ACI 440.1R-06 sont très conservatrices, alors que celles prédites par celles de JSCE-97 sont en meilleur accord avec les valeurs expérimentales. Aussi, les résultats obtenus ont montré que les équations de la nouvelle norme CSA S806-12 prédisent bien la résistance au cisaillement expérimentale. Toutefois, une amélioration de l'équation de la norme CSAS806-12, conduisant à de meilleurs résultats, est proposée. Par ailleurs, les résultats obtenus dans le cadre de cette thèse ont mené à une meilleure compréhension des mécanismes de rupture et des facteurs principaux qui contribuent à la résistance au cisaillement de dalles unidirectionnelles en béton armée de PRF. Enfin, des recommandations pour des travaux futurs y sont également formulées. // Abstract : Bridge deck and parking garage slabs are exposed to aggressive environments particularly in the North American regions resulting from the excessive use of de-icing salts. Fiber-reinforced-polymer (FRP) reinforcements have emerged as a practical and sustainable anti-corrosive reinforcing material with superior tensile strength to overcome the corrosion problem. High comfort level and increase use of the material is currently seen. Protection and regulations policies of some Public North American agencies currently include GFRP reinforcing bars as premium reinforcement. Shear behaviour in RC slabs is examined since most of the bridge deck and parking garage slabs are shear critical. However, there is still no agreement in FRP design codes and guidelines for shear strength equations. Several design code equations are still based on empirical relationships while recent developments are based on shear theories. The complex nature of shear phenomena which is influenced by many parameters, in addition to the existence of various schools of thoughts in shear, makes it difficult to find a general agreement on a unified equation. Huge research efforts are being established, however better understanding for the shear behaviour and failure mechanisms for unidirectional FRP RC slabs is still needed. In this research study, an experimental program was designed to investigate the shear behaviour of one-way concrete slabs reinforced with different types of FRP bars. A total of twenty one concrete slabs reinforced with FRP bars in addition to a steel reinforced slab were constructed and tested to failure under two-point loading. The variation in the concrete contribution to the shear strength V[subscript c] is investigated with respect to FRP reinforcement properties. Newly developed GFRP bars with high modulus, which were not previously investigated in the literature, are used. Different FRP reinforcement properties were included in the study such as reinforcement ratio, modulus of elasticity and axial stiffness, type of bars, and reinforcement configuration. Also, normal concrete and high strength concrete were considered in the research program. Analysis of the experimental results included the general behavior of the tested slabs, crack patterns, ultimate capacities, and modes of failure, load deflection relationships as well as the concrete and reinforcement strains. Test results of the present investigation indicate an influence of the reinforcement type, bar diameter, and the shear stiffness of the bars on the mode of failure and the shear strength. The experimental investigation and analysis of test results provided better understanding of concerning mechanisms of failure and factors contributing to the shear capacity of FRP RC slabs. A refined shear model to the CSA S806-12 is introduced and found to provide better results compared to the existing design codes and guidelines. The model is based on regression analysis of an experimental database. The database is assembled from twenty five different studies in addition to the present investigation. The used database includes 203 unidirectional members reinforced with FRP bars (without shear reinforcement) failing in shear. The model was evaluated through the experimental concrete shear capacities (V[subscript c exp]) of the database and found to provide good predictions. The experimental shear capacities of the database ( V[subscript c exp]) was compared to their corresponding predicted shear capacities (Vcpred ) using CSA S806-12, CAN/CSA-S6.1S1, ACI 440.1R-06, and JSCE-97. It was found that the ACI guide is very conservative. It can be noted that using this guide in its present form may reduce the economic competitiveness of fibre-reinforced polymers. JSCE recommendations are in better agreement with the test results. The Canadian CSA S806-12 equation was found to be in good fit with the experimental shear capacities.
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Shwani, Mohamed K. "Enhancing Ductility of One-way Concrete Slabs Reinforced With Welded Wire Reinforcement". DigitalCommons@USU, 2017. https://digitalcommons.usu.edu/etd/6894.

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A series of research studies have recently identified an issue called strain localization in welded wire reinforced (WWR) members. This phenomenon reportedly concentrates strains at welded cross wire locations and severely limit ductility. Those that identified the phenomenon used it to imply that WWR is unsafe because it does not warn of failure. This dissertation is investigating details to mitigate the strain localization effect and demonstrate the WWR can be used safely. A moment curvature analysis is developed using Response2000 program and calibrated using experimental data. Parametric study was developed to present a recommendation of details and minimum reinforcement required for WWR slabs. The effect of different types of WWR coating on mechanical properties were investigated. The dissertation next examined the effects of strain rate on the mechanical properties of WWR and traditional rebar. In total, fifty four slabs have been constructed using WWR and rebar with various cross wire spacing, using a realistic design. The strain localization phenomenon was not demonstrated, but WWR slabs are somewhat less ductile than traditionally reinforced members. The WWR members were shown to provide adequate ductility for warning of impending failure visually and with a well-accepted ductility measure. The WWR members were also shown the ability of load redistribution. The effect of coating demonstrates that both galvanizing WWR and coating WWR with epoxy has a positive effect on mechanical properties, along with adding corrosion resistance. The effect of strain rate shows that increase in loading rate tend to increase the yield and ultimate stresses and percent area reduction, however the loading rate increase does not have a significant effect on elastic modulus, elongation and uniform elongation.
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Islam, Mohammad Mafizul. "Moment redistribution in reinforced concrete beams and one-way slabs using 500 MPa steel /". Full text available, 2002. http://adt.curtin.edu.au/theses/available/adt-WCU20030804.121633.

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Islam, Mohammad M. "Moment redistribution in reinforced concrete beams and one-way slabs using 500 MPa steel". Thesis, Curtin University, 2002. http://hdl.handle.net/20.500.11937/631.

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In the Australian Standard, AS 3600-2001, the neutral axis parameter Ku is used as a convenient, but approximate, parameter to design for moment redistribution in building frames. The research work reported herein was conducted to obtain complete information regarding moment redistribution of beams and one-way slabs using 500 MPa steel reinforcement.A computer based iterative numerical method was developed to analyse reinforced two-span continuous concrete beams and one-way slabs. The method takes into account the material and geometrical non-linearities in the calculations. The deflected shape of the beam and one-way slab was calculated by dividing the span length into a number of rigid segments. The program also calculates the failure load and extent of moment redistribution. The analytical method was verified against the test results reported in the literature. The analytical results for load-deflection graphs and moment redistribution showed a good agreement with the test results.A parametric study was conducted using analytical method. The results of this study showed that moment redistribution depends not only on the neutral axis parameter (Ku) but also on the ratio of neutral axis parameter (Ku-/Ku+), ultimate steel strain (ªsu) and concrete compressive strength (fc).
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Islam, Mohammad M. "Moment redistribution in reinforced concrete beams and one-way slabs using 500 MPa steel". Curtin University of Technology, Department of Civil Engineering, 2002. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=13212.

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In the Australian Standard, AS 3600-2001, the neutral axis parameter Ku is used as a convenient, but approximate, parameter to design for moment redistribution in building frames. The research work reported herein was conducted to obtain complete information regarding moment redistribution of beams and one-way slabs using 500 MPa steel reinforcement.A computer based iterative numerical method was developed to analyse reinforced two-span continuous concrete beams and one-way slabs. The method takes into account the material and geometrical non-linearities in the calculations. The deflected shape of the beam and one-way slab was calculated by dividing the span length into a number of rigid segments. The program also calculates the failure load and extent of moment redistribution. The analytical method was verified against the test results reported in the literature. The analytical results for load-deflection graphs and moment redistribution showed a good agreement with the test results.A parametric study was conducted using analytical method. The results of this study showed that moment redistribution depends not only on the neutral axis parameter (Ku) but also on the ratio of neutral axis parameter (Ku-/Ku+), ultimate steel strain (ªsu) and concrete compressive strength (fc).
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Piyasena, Ratnamudigedara, i n/a. "Crack Spacing, Crack Width and Tension Stiffening Effect in Reinforced Concrete Beams and One-Way Slabs". Griffith University. School of Engineering, 2003. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20030606.165418.

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An analytical method for determining the crack spacing and crack width in reinforced concrete beams and one-way slabs is presented in this thesis. The locations and the distribution of cracks developed in a loaded member are predicted using the calculated concrete stress distributions near flexural cracks. To determine the stresses, a concrete block bounded by top and bottom faces and two transverse sections of the beam is isolated and analysed by the finite element method. Two types of blocks are analysed. They are: (i) block adjacent to the first flexural crack, and (ii) block in between successive cracks. The calculated concrete stress distribution adjacent to the first flexural crack is used to predict the locations of primary cracks (cracks formed at sections where the stresses have not been influenced by nearby cracks). The concrete stress distributions in between successive cracks, calculated for various crack spacings and load levels, are used to predict the formation of secondary cracks in between existing cracks. The maximum, minimum and the average crack spacing at a given load level are determined using the particular crack spacing that would produce a concrete tensile stress equal to the flexural strength of concrete. The resulting crack width at reinforcement level is determined as the relative difference in elastic extensions of steel and surrounding concrete. The accuracy of the present method is verified by comparing the predicted spacing and width of cracks with those measured by others. The analytical method presented in this thesis is subsequently used to investigate the effects of various variables on the spacing and width of cracks, and the results are presented. These results are used to select the set of parameters that has the most significant effect. A parametric study is then carried out by re-calculating the spacing and width of cracks for the selected parameters. Based on the results of this parametric study, new formulas are developed for the prediction of spacing and width of cracks. The accuracy of these formulas is ascertained by comparing the predicted values and those measured by other investigators on various types of beams under different load levels. The calculated stress distributions between successive cracks are also used to develop a new method of incorporating the tension stiffening effect in deflection calculation. First, curvature values at sections between adjacent cracks are determined under different load levels, using the concrete and steel stresses. These results are used to develop an empirical formula to determine the curvature at any section between adjacent cracks. To verify the accuracy of the new method, short-term deflections are calculated using the curvature values evaluated by the proposed formula for a number of beams, and the results are compared with those measured by others.
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Piyasena, Ratnamudigedara. "Crack Spacing, Crack Width and Tension Stiffening Effect in Reinforced Concrete Beams and One-Way Slabs". Thesis, Griffith University, 2003. http://hdl.handle.net/10072/366060.

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An analytical method for determining the crack spacing and crack width in reinforced concrete beams and one-way slabs is presented in this thesis. The locations and the distribution of cracks developed in a loaded member are predicted using the calculated concrete stress distributions near flexural cracks. To determine the stresses, a concrete block bounded by top and bottom faces and two transverse sections of the beam is isolated and analysed by the finite element method. Two types of blocks are analysed. They are: (i) block adjacent to the first flexural crack, and (ii) block in between successive cracks. The calculated concrete stress distribution adjacent to the first flexural crack is used to predict the locations of primary cracks (cracks formed at sections where the stresses have not been influenced by nearby cracks). The concrete stress distributions in between successive cracks, calculated for various crack spacings and load levels, are used to predict the formation of secondary cracks in between existing cracks. The maximum, minimum and the average crack spacing at a given load level are determined using the particular crack spacing that would produce a concrete tensile stress equal to the flexural strength of concrete. The resulting crack width at reinforcement level is determined as the relative difference in elastic extensions of steel and surrounding concrete. The accuracy of the present method is verified by comparing the predicted spacing and width of cracks with those measured by others. The analytical method presented in this thesis is subsequently used to investigate the effects of various variables on the spacing and width of cracks, and the results are presented. These results are used to select the set of parameters that has the most significant effect. A parametric study is then carried out by re-calculating the spacing and width of cracks for the selected parameters. Based on the results of this parametric study, new formulas are developed for the prediction of spacing and width of cracks. The accuracy of these formulas is ascertained by comparing the predicted values and those measured by other investigators on various types of beams under different load levels. The calculated stress distributions between successive cracks are also used to develop a new method of incorporating the tension stiffening effect in deflection calculation. First, curvature values at sections between adjacent cracks are determined under different load levels, using the concrete and steel stresses. These results are used to develop an empirical formula to determine the curvature at any section between adjacent cracks. To verify the accuracy of the new method, short-term deflections are calculated using the curvature values evaluated by the proposed formula for a number of beams, and the results are compared with those measured by others.
Thesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Engineering
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Papantoniou, Ioannis, Catherine Papanicolaou i Thanasis Triantafillou. "Optimum design of one way concrete slabs cast against Textile Reinforced Concrete Stay-in-Place Formwork Elements". Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2009. http://nbn-resolving.de/urn:nbn:de:bsz:14-ds-1244051009995-91187.

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This study presents a conceptual design process for one-way reinforced concrete slabs cast over Textile Reinforced Concrete (TRC) Stay-in-Place (SiP) formwork elements, aiming at the minimization of the composite slab cost satisfying Ultimate Limit State (ULS) and Serviceability Limit State (SLS) design criteria. The thin-walled TRC element is considered to participate in the structural behaviour of the composite slab. This distinct function of the TRC element (as formwork and as a part of a composite element) distinguishes the design procedure into two States: a Temporary and a Permanent one. Design parameters such as the type of the textile reinforcement (material), the geometry of the TRC cross-section, the flexural strength of the fine-grained concrete in the TRC element and the compressive strength of the cast in-situ concrete are considered as the main optimization variables.
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Al, Nussairi Alaa. "Characterising the static and impact load resistance of one-way RC slabs strengthened by NSM CFRP rods". Thesis, University of Bristol, 2018. http://hdl.handle.net/1983/3798ec86-ce52-4022-a27f-af94fbfb4a34.

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This study aims to enhance the blast resistance of reinforced concrete slabs which are commonly encountered in modern buildings. The focus is on preventing their collapse by increasing their ductility and energy dissipation by strengthening them with near surface mounted (NSM) carbon fibre reinforced polymer (CFRP) rods. Laboratory experiments were conducted to study the entire responses of one-way RC slabs with and without NSM CFRP strengthening with different loading rates (quasi-static and impact load). The quasi-static tests showed that strengthening both faces of the slab contributes to increasing the load capacity and ductility of the slab. In addition, the dissipated energy of the control slab was doubled in the strengthened slab. In the impact tests, the dissipated energy enhanced by a factor of 2.1 when only the compression face of the slab was strengthened by 7 CFRP bars. Also, applying the external strengthening technique led to a change in the crack pattern from one opened crack to multiple cracks in the tension face. Analytical and numerical models were also provided in this study to simulate the static and impact responses of the one-way NSM CFRP RC slabs. The analytical model was developed by modifying the traditional nonlinear layered analysis to incorporate CFRP bars and the various strain rate values. The modification in the nonlinear layered method comprised deriving and including the effect of the crack patterns on the entire response of the slabs, and combining a single-degree-of-freedom (SDOF) method to estimate the maximum response of the slab under blast and impact loads. The commercial software Abaqus was utilized in the numerical analysis. Results from both these models show a good agreement with the experimental results in terms of the entire load-deflection behaviour for both quasi-static and impact tests. The developed models were used to investigate the effects of the potential relevant factors on the entire response of the NSM CFRP system. The results show that the dissipated energy achieved by strengthening both faces of the slab depends on the ratio of the strengthening in each face, and the optimum dissipated energy was obtained when the CFRP in the tension face was allowed to rupture by increasing the CFRP strengthening ratio in the compression face if the shear resistance is controlled. The results also showed that the enhancing factor of the energy dissipation was almost strain rate independent.
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Książki na temat "One-way slabs"

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Al-Dafiry, Hamoud Ahmed. Impact resistance of reinforced fibrous concrete beams and one-way slabs. Birmingham: University of Birmingham, 1991.

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Phillips, Jeffrey M. P. The effect of corrosion on the structural performance of new and repaired one-way slabs. 1993.

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Mercati, Flavio. Shape Dynamics and the Linking Theory. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198789475.003.0012.

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This chapter explains in detail the current Hamiltonian formulation of SD, and the concept of Linking Theory of which (GR) and SD are two complementary gauge-fixings. The physical degrees of freedom of SD are identified, the simple way in which it solves the problem of time and the problem of observables in quantum gravity are explained, and the solution to the problem of constructing a spacetime slab from a solution of SD (and the related definition of physical rods and clocks) is described. Furthermore, the canonical way of coupling matter to SD is introduced, together with the operational definition of four-dimensional line element as an effective background for matter fields. The chapter concludes with two ‘structural’ results obtained in the attempt of finding a construction principle for SD: the concept of ‘symmetry doubling’, related to the BRST formulation of the theory, and the idea of ‘conformogeometrodynamics regained’, that is, to derive the theory as the unique one in the extended phase space of GR that realizes the symmetry doubling idea.
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Części książek na temat "One-way slabs"

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Hoffman, Edward S., David P. Gustafson i Albert J. Gouwens. "One-Way Reinforced Concrete Slabs". W Structural Design Guide to the ACI Building Code, 37–54. Boston, MA: Springer US, 1998. http://dx.doi.org/10.1007/978-1-4757-6619-6_3.

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Simmonds, Sidney H. "One- and Two-Way Slabs". W Handbook of Concrete Engineering, 81–120. Boston, MA: Springer US, 1985. http://dx.doi.org/10.1007/978-1-4757-0857-8_3.

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Setareh, Mehdi, i Robert Darvas. "Rectangular Beams and One-Way Slabs". W Concrete Structures, 37–149. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-24115-9_2.

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Vercher, Jose, Enrique Gil, Ángeles Mas i Carlos Lerma. "Residual Safety in One-Way Slabs with Severe Corrosion". W Building Pathology and Rehabilitation, 145–61. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-47302-0_7.

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Satasivam, Sindu, Yu Bai i Xiao-Ling Zhao. "Fibre Reinforced Polymer Built-Up Beams and One-Way Slabs". W Composites for Building Assembly, 27–48. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-4278-5_2.

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Zarei, Aslan, i Douglas Tomlinson. "Development of Design Charts for One-Way Slabs Reinforced with Glass Fiber Reinforced Polymer (GFRP) Bars". W 8th International Conference on Advanced Composite Materials in Bridges and Structures, 359–67. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-09632-7_42.

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Anas, S. M., Mehtab Alam i Mohammad Umair. "Performance of One-Way Concrete Slabs Reinforced with Conventional and Polymer Re-bars Under Air-Blast Loading". W Lecture Notes in Civil Engineering, 179–91. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-6389-2_18.

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Nareshnayak, N., i B. N. Rao. "Numerical Analysis of One-Way Flexural Strength of Voided Slab". W Structural Integrity, 250–56. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-04793-0_19.

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Huang, Jun-Qi, i Jian-Guo Dai. "Shear Performance of BFRP Reinforced Geopolymer Concrete One-Way Slab". W Lecture Notes in Civil Engineering, 1085–96. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-88166-5_95.

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Bharathi Murugan, R., G. Murali, Sunita, M. K. Haridharan i S. Karthikeyan. "Numerical Analysis of One Way – Prestressed Concrete Slab Subjected to Fire". W Structural Integrity, 287–305. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-98335-2_19.

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Streszczenia konferencji na temat "One-way slabs"

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Zhao, Junming, i Yijun Feng. "One-way electromagnetic energy absorber base on composite metamaterial slabs". W 2012 International Conference on Microwave and Millimeter Wave Technology (ICMMT). IEEE, 2012. http://dx.doi.org/10.1109/icmmt.2012.6230433.

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ZHAO, H. D., i K. H. TAN. "STRENGTHENING OF ONE-WAY RC SLABS WITH OPENINGS USING CFRP SYSTEMS". W Proceedings of the Sixth International Symposium on FRP Reinforcement for Concrete Structures (FRPRCS–6). World Scientific Publishing Company, 2003. http://dx.doi.org/10.1142/9789812704863_0104.

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Merta, I., i S. Kravanja. "Cost Optimum Design of Reinforced Concrete Simply Supported One-Way Slabs". W 12th Biennial International Conference on Engineering, Construction, and Operations in Challenging Environments; and Fourth NASA/ARO/ASCE Workshop on Granular Materials in Lunar and Martian Exploration. Reston, VA: American Society of Civil Engineers, 2010. http://dx.doi.org/10.1061/41096(366)251.

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"Fusion welding thermal simulation in corrugated steel for one-way slabs". W The 34th European Modeling & Simulation Symposium. CAL-TEK srl, 2022. http://dx.doi.org/10.46354/i3m.2022.emss.033.

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"Indirectly-Supported One-Way R/C Slabs: Durability And Safety Issues". W SP-305: Durability and Sustainability of Concrete Structures. American Concrete Institute, 2015. http://dx.doi.org/10.14359/51688575.

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"One-Way Slabs Reinforced with Glass Fiber Reinforced Polymer Reinforcing Bars". W SP-188: 4th Intl Symposium - Fiber Reinforced Polymer Reinforcement for Reinforced Concrete Structures. American Concrete Institute, 1999. http://dx.doi.org/10.14359/5629.

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Hu, Cheng, Yuan Wu i Shuangyin Cao. "Study on the Behavior of RC Two-Way Slabs Bonded with One-Way Steel Strips". W 2010 International Conference on E-Product E-Service and E-Entertainment (ICEEE 2010). IEEE, 2010. http://dx.doi.org/10.1109/iceee.2010.5661198.

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CASADEI, P., T. IBELL i A. NANNI. "EXPERIMENTAL RESULTS OF ONE-WAY SLABS WITH OPENINGS STRENGTHENED WITH CFRP LAMINATES". W Proceedings of the Sixth International Symposium on FRP Reinforcement for Concrete Structures (FRPRCS–6). World Scientific Publishing Company, 2003. http://dx.doi.org/10.1142/9789812704863_0105.

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Mahdi, Ahmed A., i Murtada A. Ismael. "Flexural Behavior and Sustainability Analysis of Hollow-core R.C. One-way Slabs". W 2020 3rd International Conference on Engineering Technology and its Applications (IICETA). IEEE, 2020. http://dx.doi.org/10.1109/iiceta50496.2020.9318843.

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"Long-Term Deflections of High-Strength Concrete Beams and One-Way Slabs". W SP-161: Recent Developments in Deflection Evaluation of Concrete. American Concrete Institute, 1996. http://dx.doi.org/10.14359/1505.

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Raporty organizacyjne na temat "One-way slabs"

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Two types of lenses for deep underwater photography. Woods Hole Oceanographic Institution, grudzień 2022. http://dx.doi.org/10.1575/1912/29564.

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In underwater photography, the object is immersed in water while the image is usually formed in air. The most obvious, straightforward way to form an image under these circumstances with a conventional type of lens is to use a plane parallel slab of glass as a window in front of the lens to separate the water from the air space. For most types of camera lenses, this is a perfectly adequate solution; But if one looks at the problem carefully, it is evident that such a system introduces a chromatic aberration referred to as lateral color. The source of this aberration is illustrated in Fig. 1. The dispersion at the glass to air interface overcompensates for the dispersion at the water to glass interface. As a result, the direction of a ray entering the camera lens for any given ray incident on the window varies with the wavelength of light.
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