Journal articles on the topic 'One-way slabs'
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1
Yaagoob, Ali H., and Ibrahem S. Harba. "Behavior of Self Compacting Reinforced Concrete One Way Bubble Deck Slab." Al-Nahrain Journal for Engineering Sciences 23, no. 1 (March 20, 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, and Ayman El-Zohairy. "Behavior of One-Way Reinforced Concrete Slabs with Polystyrene Embedded Arched Blocks." Buildings 12, no. 3 (March 10, 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, and Chang Sik Choi. "Flexural Capacities of One-Way Hollow Slab with Donut Type Hollow Sphere." Key Engineering Materials 452-453 (November 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, no. 1 (March 1, 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., and Hassan Falah Hassan. "Flexural Strength of Modified Reactive Powder Concrete One Way Slabs." Open Civil Engineering Journal 13, no. 1 (December 31, 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., and 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, and Muhammad Iqbal. "Structural Performance of One-Way Slabs Reinforced with Steel and Polypropylene Fibers." Jurnal Kejuruteraan 33, no. 2 (May 30, 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, and Wen Jun Hu. "Experimental Research on Flexural Behavior of Recycled Concrete One-Way Slab Reinforced with CFRP." Advanced Materials Research 261-263 (May 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, and Ali Hussein Ali Al-Ahmed. "Behaviour of One-Way Reinforcement Concrete Cantilever Slabs with Openings." IOP Conference Series: Earth and Environmental Science 961, no. 1 (January 1, 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, and Amged O. Abdelatif. "Modeling Deflection in Reinforced Concrete One-way Slabs using Eurocode2 Model." FES Journal of Engineering Sciences 9, no. 1 (February 22, 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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Ashteyat, Ahmed M., Yousef S. Al Rjoub, Ala’ T. Obaidat, and Huthaifah Dagamseh. "Strengthening and repair of one-way and two-way self-compacted concrete slabs using near-surface-mounted carbon-fiber-reinforced polymers." Advances in Structural Engineering 22, no. 11 (April 17, 2019): 2435–48. http://dx.doi.org/10.1177/1369433219843649.
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The effectiveness of near-surface-mounted carbon-fiber-reinforced polymers on strengthening and repair of self-compacted concrete slabs was investigated experimentally and numerically. Twenty slabs were cast (10 one-way and 10 two-way) and tested under four-point load. Strengthening and repair effectiveness was investigated on slabs using near-surface-mounted carbon-fiber-reinforced polymer strips with straight and inclined orientation. Repair was performed on eight slabs using near-surface-mounted carbon-fiber-reinforced polymer strips with an orientation based on the best cost/capacity ratio, with two preloading levels: 35% and 50% of the ultimate load of the control slab. The results showed that using near-surface-mounted carbon-fiber-reinforced polymers increases the ultimate strength of one-way strengthened self-compacted concrete slabs (45%–163%) for both strip orientation, with the straight orientation performing better. Also, the cracking load and stiffness increased, while deflection decreased. The increase in ultimate strength for strengthened two-way slabs was 15% to 17%. The ultimate deflection and toughness of the two-way strengthened slabs increased 43% and 34%, respectively. Using near-surface-mounted carbon-fiber-reinforced polymers restored the load capacity of repaired one-way and two-way slabs but was more effective for one-way slabs. The repaired one-way slabs regained up to 223% of the control slabs’ ultimate strength, with a significant increase in stiffness (296%). The repaired two-way slabs regained up to 116% of the control slabs’ ultimate strength. The strength was higher in the case of the 50% preload compared to 35% preload. The finite element model shows somehow a reasonable capability of predicting the experimental behavior with a gap in terms of the stiffness and the maximum load.
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Xu, Xiaoqing, and Zhujian Hou. "Experimental Study on One-Way BFRP Bar-Reinforced UHPC Slabs under Concentrated Load." Materials 13, no. 14 (July 10, 2020): 3077. http://dx.doi.org/10.3390/ma13143077.
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The application of fiber-reinforced polymer (FRP) bars and ultra-high performance concrete (UHPC) in the field of civil engineering is promising. An innovative FRP bar-reinforced UHPC short-ribbed bridge deck slab, with low self-weight and high structural performance, was proposed in this study. The behavior of one-way basalt FRP (BFRP) bar-reinforced UHPC slabs under concentrated load was experimentally investigated, and compared with that of a steel bar-reinforced UHPC slab. The ultimate capacity of the one-way BFRP bar-reinforced UHPC slab was 0.59 times that of the steel bar-reinforced UHPC slab, while its ductility was better. Increasing the reinforcement ratio and loading area was beneficial to the ductility of one-way BFRP bar-reinforced UHPC slabs. Moreover, the model proposed by EI-Gamal et al. was found to be suitable for evaluating the punching shear capacities of one-way BFRP bar-reinforced UHPC slabs. However, the model failed to consider the unique strain-hardening characteristics of UHPC, which led to conservative prediction.
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Zhang, Da Shan, and Yu Li Dong. "Experimental Behavior of One-Way Concrete Slabs at Large Displacements." Applied Mechanics and Materials 105-107 (September 2011): 1035–39. http://dx.doi.org/10.4028/www.scientific.net/amm.105-107.1035.
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This paper presents the tensile membrane action on one-way reinforced concrete slabs, and two full-scale specimens with one edge clamped and one edge simply supported were tested at large displacements. The details of the two tests including support conditions, arrangement of reinforcements and layout of displacement transducers are described. The test results show that the load-carrying capacity of the two slabs is significantly improved due to the tensile membrane action, about 26.6% more than the predicted value using the well-established yield-line theory. Until maximum vertical displacement reached 1/15 of the span-length, the slab did not fail and carried the load steadily.
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Nguyen, Huy Q., Tri N. M. Nguyen, Do Hyung Lee, and Jung J. Kim. "A Design Method to Induce Ductile Failure of Flexural Strengthened One-Way RC Slabs." Materials 14, no. 24 (December 12, 2021): 7647. http://dx.doi.org/10.3390/ma14247647.
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Strengthening existing reinforced concrete (RC) slabs using externally bonded materials is increasingly popular due to its adaptability and versatility. Nevertheless, ductility reduction of the rehabilitated flexural members with these materials can lead to brittle shear failure. Therefore, a new approach for strengthening is necessary. This paper presents a methodology to induce ductile failure of flexural strengthened one-way RC slabs. Ultimate failure loads can be considered to develop the proposed design methodology. Different failure modes corresponding to ultimate failure loads for RC slabs are addressed. Flexural and shear failure regions of RC slabs can be established by considering the failure modes. The end span of the concrete slab is shown for a case study, and numerical examples are solved to prove the essentiality of this methodology.
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Raongjant, Werasak, and Meng Jing. "One-Way Slab of Structural Insulated Panel Strengthened with FRP." Materials Science Forum 859 (May 2016): 56–61. http://dx.doi.org/10.4028/www.scientific.net/msf.859.56.
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In order to promote the usage of structural insulated panels (SIP) as floor and roof for residential buildings, the bending capacity of SIP should be improved. In this paper, fiber reinforced polymer sheets were used as strengthening materials. The new variation of SIPs, which is called Fiber Reinforced Structural Insulated Panel (FSIP), was tested in this paper. Five one-way slabs were subjected to uniformly distributed loads till failure. It is observed that the flexural bearing capacity and stiffness of the slabs were affected by the thickness of foam core and the strength of FRP sheet. By strengthened with FRP sheets, the one-way slab of structural insulated panel can be used for floor and roof in residential and light commercial buildings.
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Razavi Tosee, Seyed Vahid, Iman Faridmehr, Moncef L. Nehdi, Vagelis Plevris, and Kiyanets A. Valerievich. "Predicting Crack Width in CFRP-Strengthened RC One-Way Slabs Using Hybrid Grey Wolf Optimizer Neural Network Model." Buildings 12, no. 11 (November 3, 2022): 1870. http://dx.doi.org/10.3390/buildings12111870.
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This study deploys a hybrid Grey Wolf Optimizer Neural Network Model for predicting the crack width in reinforced concrete slabs strengthened with carbon fiber-reinforced polymers (CFRP). Reinforced concrete (RC) one-way slabs (1800 × 400 × 120 mm in size) were strengthened with CFRP with various lengths (1800, 1100, and 700 mm) and subjected to four-point bending. The experimental results were compared to corresponding values for conventional RC slabs. The observed crack width results were recorded, and subsequently examined against the expression recommended by Eurocode 2. To estimate the crack width of CFRP-reinforced slabs, ANN combined with the Grey Wolf Optimizer algorithm was employed whereby the applied load, CFRP width/length, X/Y crack positions, and stress in steel reinforcement and concrete were defined as the input parameters. Experimental results showed that the larger the length and width of the carbon fiber, the smaller the maximum crack width in the tensile area of the slab at the final load step. On average, the crack width in slabs retrofitted with CFRP laminates increased by around 80% compared to a slab without CFRP. The results confirm that the equation provided by Eurocode 2 provides an unconservative estimation of crack widths for RC slabs strengthened with CFRP laminates. On the other hand, the results also confirm that the proposed informational model could be used as a reliable tool for estimating the crack width in RC slabs. The findings provide valuable insight into the design approaches for RC slabs and rehabilitation strategies for existing deficient RC slabs using CFRP.
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Gao, Dan Ying, Pei Bo You, and Chang Hui Zhang. "Crack Resistant Performance and Crack Width of one-Way Slabs Strengthened with FRP." Applied Mechanics and Materials 71-78 (July 2011): 3810–15. http://dx.doi.org/10.4028/www.scientific.net/amm.71-78.3810.
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Based on the tests of six reinforced concrete slabs strengthened with fibre reinforced plastic (FRP) sheets and one reference slab without the sheet, the influences of factors such as type of FRP sheets (CFRP and GFRP), amount of FRP sheets and strengthening scheme upon the crack resistant performance were presented and discussed in this paper. In the end, a calculation method was put forward, which can be used to calculate cracking moment and crack width in reinforced concrete slabs strengthened with FRP sheets.
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Mohammed, Qasim. "Performance of high-strength concrete one-way slabs with embedded BFRP bar reinforcement." International Journal of Advanced Engineering, Sciences and Applications 1, no. 3 (July 15, 2020): 1–9. http://dx.doi.org/10.47346/ijaesa.v1i3.55.
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In this paper, a theoretical study has been concluded using ANSYS-15 software to investigate the performance of reinforced concrete one-way slabs with embedded basalt fibre reinforced polymer (BFRP) bars under monotonic loads. Six slabs have been considered, two were simply supported, and four were continuous each with two-span. Several parameters have been studied, such as continuity condition, reinforcement ratio, the position of the reinforcement and the effect of replacement basalt bars by steel bars. It is found that the finite element analysis (FEA) agree with experimental results in a range of 1% - 9% in deflection compared with the maximum difference of ACI440 committee of 49%. For simply supported slabs, it is found that increasing the reinforcement from 0.2% to 0.5% resulted in increased capacity by 86%. For continuous slabs, it is observed that increasing the reinforcement for top and bottom from 0.2% to 0.5% resulted in increased capacity by 60% while the maximum deflection is reduced by 56%. Moreover, it is found that with an efficient distribution of bars a slab with a reinforcement ratio of 0.7%, the load capacity is improved by 12.5% and a reduction in maximum deflection 46%. Furthermore, it is found that for simply supported slabs, it is better to use higher ratios of BFRP reinforcement,0.5% instead of 0.2% due to a good improvement in capacity. Regarding dissipation in energy, it is found that the difference in predicting toughness by FEA by ANSYS was 1% - 15% for simply supported slabs while for continuous slabs the dissipation in energy was in the range of 20% - 50% compared with experimental results.
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Mazin B. Abdul-Rahman, Dr, Dr Alya'a A. Al-attar, and Amenah M. Younus. "Elevated Temperature Effects on the Behavior of One-Way Fi-brous Reinforced Concrete Slabs." International Journal of Engineering & Technology 7, no. 4.37 (December 13, 2018): 179. http://dx.doi.org/10.14419/ijet.v7i4.37.24097.
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In this research, the effect of elevated temperature on the flexural behavior of one-way reinforced concrete slabs under service static loads contain different volume fraction (0.25% , 0.75% and 1.25%) of steel fibers and different addition ratios (15%, 20% and 25%) of fly ash in addition to the reference slabs with not any additives was studied. For this purpose, thirty cylinders (150 *300)mm , thirty prisms (100 * 100 * 500)mm and forty one-way slabs (900 * 350 * 70) mm were cast and tested. The one-way tested slabs were divided into two groups. The first group (of twenty slabs) were tested to determine the ultimate flexural strength under static loads at normal temperature. While the second group (of twenty slabs) were tested to determine the flexural behavior of slabs under static service loads at elevated temperature (using burning furnace). In this test, the samples are exposed to rising temperature reached 850℃. From these tests, the relationships between the load and mid-span deflection as well as the relations between the fire-time and mid-span deflection are measured. The results showed that the addition of steel fibers and fly ash particles will enhance the flexural behavior of concrete slabs. The highest increase in ultimate load compared to the reference slab was (28.31%) at the volume ratio 1.25% of the steel fibers and 25% of the fly ash at normal temperatures , And the rate of increase of the deflection with fire time was the lowest increase rate is 14.1% at the volume of 1.25% of steel fibers and the proportion of weight 20% of fly ash at high temperature.
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Saeed, Jalal A. Saeed, Payman H. Mohammad, and Ibrahim H. Aziz. "Behavior and Flexural Strength of Ferrocement One Way Slabs with Square Openings." Journal of Zankoy Sulaimani - Part A 1, no. 1 (May 1, 1997): 57–67. http://dx.doi.org/10.17656/jzs.10015.
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Mohammed, Tamara Amer, and Hayder Mohammed Kadhim. "Effect of Pumice Stone and Sugar Molasses on the Behavior of Reinforced Concrete One-Way Ribbed Slabs." Civil Engineering Journal 8, no. 2 (February 1, 2022): 334–47. http://dx.doi.org/10.28991/cej-2022-08-02-011.
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The world is currently heading towards sustainability by reducing the amount of concrete, thus reducing the total unit weight. Moreover, design construction requires materials with a higher strength-to-weight ratio. Ribbed slabs and lightweight concrete (LWC) are considered two leading sustainability facilities. This research developed an experimental study to evaluate the effects of concrete type, steel reinforcement ratio, the geometry of ribs, voiding ratio, and slab type on the structural behavior of one-way ribbed slabs. Eight of the one-way slabs were constructed using pumice stone and by-product material sugar molasses (SM), and one slab was constructed using gravel and SM. These slabs were tested under a static two-point load and simply supported until failure. The results showed that using SM with pumice stone instead of gravel led to high strength-lightweight concrete (HSLWC), with a cylinder compressive strength of 42.2 MPa and a density of 1943 kg/m3, which meets the requirements of HSLWC codes. Using HSLWC instead of high-strength normal-weight concrete (HSNWC) decreased the thermal conductivity by 43.55% and the unit weight by 19.31%. Moreover, the ultimate strength of the HSLWC one-way ribbed slab decreased by 17.70%. Overcoming this strength reduction necessitated increasing the steel reinforcement ratio of the ribs from 0.28 to 0.44% in the HSLWC ribbed slab. Changing the number of ribs at the same amount of HSLWC showed a minor effect on the strength capacity of slabs but showed an economic benefit. However, increasing the rib width to reduce the voiding ratio from 44 to 40% resulted in a greater improvement in structural efficiency (SE) of one-way ribbed slab than reducing it from 44 to 33%. Consequently, the optimum rib width was 120 mm. Moreover, using a ribbed slab instead of a solid slab of HSLWC at the same amount of concrete increased the ultimate strength by 130.37%, decreased deflection by 3.99%, and improved SE by 126.46%. Furthermore, experimental results of ultimate load were compared with the ACI 318-19 code design equation. Doi: 10.28991/CEJ-2022-08-02-011 Full Text: PDF
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Qasim, Mohammed M., and Mazin B. Abdul Rahman. "Strength of SIFCON- Ferrocement One-Way Ribbed Slabs Contain Steel Fibers." IOP Conference Series: Earth and Environmental Science 961, no. 1 (January 1, 2022): 012066. http://dx.doi.org/10.1088/1755-1315/961/1/012066.
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Abstract Slurry infiltrated fiber concrete” composites (SIFCON) are a novel type of concrete with improved strength, ductility, and crack resistance. In this study, infiltrating fibers (SIFCON) were used to reinforce of specimens of ferrocement one way ribbed slabs. The laboratory work consists of cast and testing of eight specimens with dimensions of 750 mm in length, 500 mm in width and 50 mm in depth. These samples have the same wire mesh reinforcement and the same shape as the ferrocement slabs. Two reference ferrocement slab without ribs contains SIFCON and six ferrocement slabs with ribs contains SIFCON. The variables were the volumetric ratio of fibers in the ribs, which were (2, 4 and 6)% and type of steel fiber (hook-end and hybrid fiber). Hybrid fibers contain two type of steel fiber (hook-end and micro steel fiber) with equal ratio. All samples were tested under line load up to failure with mid deflections for each test with simple supported. The results of the test showed that the presence of steel fibers in the ferrocement ribs, for both types of steel fibers, improves the resistance to the final loads and the ability to reduce deflection and increases the ductility and stiffness significantly.
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Zhou, Lingzhu, Pengcheng Dong, Yu Zheng, Gangbing Song, and Xiaolu Wang. "Investigation of the Structural Behaviors of One-way HVFA-SCC Slabs Reinforced by GFRP Bars." Current Chinese Science 1, no. 1 (December 23, 2020): 160–82. http://dx.doi.org/10.2174/2210298101666200909160857.
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Background: The corrosion of steel bar leads to the deterioration of structural behaviors, high cost maintenance, shortened service life. The bridge deck structures constructed by Fiber Reinforced Polymer (FRP) bars and High-Volume Fly Ash-Self-Compacting Concrete (HVFA-SCC) can achieve low energy consumption, sustainable construction and high durability. However, the structural behaviors of this bridge deck are still unclear. Objective: The aim of this paper is to study the structural behaviors, including ultimate loads, failure mode, cracking behavior, deflection and strain of one-way HVFA-SCC slabs reinforced with Glass- FRP (GFRP). Experimental: Eleven full-scale HVFA-SCC slabs, varying in reinforcement diameter, reinforcement ratio, shear-span ratio, the type of reinforcing materials and concrete matrix materials, were tested by using a four-point bending load. Methods: The test results of tested specimens were compared with existing theoretical models, such as crack load, ultimate bearing capacity, maximum crack width, maximum crack space and deflection predicted model. Results: The GFRP reinforced HVFA-SCC slab exhibits similar structural behaviors to the GFRP reinforced NC slab. The maximum crack width of HVFA-SCC slab is significantly increased by using GFRP bars with a diameter of 19 mm. Conclusion: It is concluded that it is feasible to use HVFA-SCC instead of NC combined with GFRP bars in bridge deck structures. The stress limit of concrete materials (0.45fc) is the main governing factor for the service limit state (SLS) of GFRP reinforced HVFA-SCC slabs. The maximum crack width of GFRP reinforced HVFA-SCC slabs can be predicted by using EHE-08 and GB 50608-2010 models.
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Majeed, Wasif K., Muyasser M. Joma’h, and Mazin B. Abdulrahman. "Structural Behavior of Fibrous Reinforced Concrete Hollow Core One-Way Slabs Strengthening by C.F.R.P." Tikrit Journal of Engineering Sciences 22, no. 1 (April 1, 2015): 101–11. http://dx.doi.org/10.25130/tjes.22.1.10.
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A reinforced concrete hollow core one-way slab is one of the types of slabs used widely around the world in residential and industrial buildings to take advantage of them Economic and thermal insulation as well as to reduce the self-weight of the construction. The aim of the present study is to examine the structural behavior of the reinforced concrete hollow core one-way slabs reduce failure using the normal concrete and fibrous concrete and then strengthened using carbon fiber(CFRP)This study include molding of ( 6) specimens differ in terms of the voids volume (Vv) , volumetric percentage of steel fibers (
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Wang, Yabo, H. T. Liu, G. F. Dou, C. H. Xi, and L. Qian. "Experimental Study of Multi-Ribbed One-Way Composite Slabs Made of Steel Fibre, Foam, and Normal Concrete." Archives of Civil Engineering 64, no. 2 (December 31, 2018): 79–96. http://dx.doi.org/10.2478/ace-2018-0018.
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Abstract This paper aims to study the effect of reinforcement configuration (steel fibre and rebar) on the mechanical performance of composite slabs of the same total steel contents. We manufactured four pieces of fullscale multi-ribbed composite prefabricated slabs with different reinforcement configurations by using steel fibrereinforced concrete, foam concrete, and normal concrete. The multi-ribbed composite prefabricated slab has many excellent properties, such as light weight, good thermal and sound insulation. Thus, it can be applied to fabricated structures. In addition, the composite prefabricated slabs with the same total steel contents but with different reinforcement configurations were studied under the same static load, and many technical indicators such as crack resistance capacity, yield load, ultimate load capacity, maximum deflection, destructive pattern, and stress of steel rebar were obtained. Results indicate reinforcement configuration has a significant effect on the mechanical performance of composite prefabricated slabs with the same total steel contents, and composite prefabricated slabs reinforced with longitudinal rebar and steel fibre (volume fraction is 1.5%) have the best mechanical performance and ductility.
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Ibrahim, Falah Hassan, and Ali Hussein Ali. "Finite Element Analysis of Cracked One-Way Bubbled Slabs Strengthened By External Prestressed Strands." Journal of Engineering 27, no. 1 (January 1, 2021): 45–65. http://dx.doi.org/10.31026/j.eng.2021.01.04.
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Bubbled slabs can be exposed to damage or deterioration during its life. Therefore, the solution for strengthening must be provided. For the simulation of this case, the analysis of finite elements was carried out using ABAQUS 2017 software on six simply supported specimens, during which five are voided with 88 bubbles, and the other is solid. The slab specimens with symmetric boundary conditions were of dimensions 3200/570/150 mm. The solid slab and one bubbled slab are deemed references. Each of the other slabs was exposed to; (1) service charge, then unloaded (2) external prestressing and (3) loading to collapse under two line load. The external strengthening was applied using prestressed wire with four approaches, which are L1-E, L2-E, L1-E2, and L2-E2, where the lengths and eccentricities of prestressed wire are (L1=1800, L2=2400, E1=120 and E2=150 mm). The results showed that each reinforcement approach restores the initial capacity of the bubbled slab and improves it in the ultimate load capacity aspect. The minimum and maximum ultimate strength of strengthened cracked bubbled slab increased by (17.3%-64.5%) and (25.7%-76.3%) than solid and bubbled slab, respectively. It is easier to improve behavior with an increased eccentricity of the prestressed wire than to increase its length.
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Ibrahim, Falah Hassan, and Ali Hussein Ali. "Finite Element Analysis of Cracked One-Way Bubbled Slabs Strengthened By External Prestressed Strands." Journal of Engineering 27, no. 1 (January 1, 2021): 45–65. http://dx.doi.org/10.31026/10.31026/j.eng.2021.01.04.
Full textAbstract:
Bubbled slabs can be exposed to damage or deterioration during its life. Therefore, the solution for strengthening must be provided. For the simulation of this case, the analysis of finite elements was carried out using ABAQUS 2017 software on six simply supported specimens, during which five are voided with 88 bubbles, and the other is solid. The slab specimens with symmetric boundary conditions were of dimensions 3200/570/150 mm. The solid slab and one bubbled slab are deemed references. Each of the other slabs was exposed to; (1) service charge, then unloaded (2) external prestressing and (3) loading to collapse under two line load. The external strengthening was applied using prestressed wire with four approaches, which are L1-E, L2-E, L1-E2, and L2-E2, where the lengths and eccentricities of prestressed wire are (L1=1800, L2=2400, E1=120 and E2=150 mm). The results showed that each reinforcement approach restores the initial capacity of the bubbled slab and improves it in the ultimate load capacity aspect. The minimum and maximum ultimate strength of strengthened cracked bubbled slab increased by (17.3%-64.5%) and (25.7%-76.3%) than solid and bubbled slab, respectively. It is easier to improve behavior with an increased eccentricity of the prestressed wire than to increase its length.
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Tošić, Nikola, and Jean Torrenti. "New Eurocode 2 provisions for recycled aggregate concrete and their implications for the design of one-way slabs." Gradjevinski materijali i konstrukcije 64, no. 2 (2021): 119–25. http://dx.doi.org/10.5937/grmk2102119t.
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A significant amount of research has been performed on recycled aggregate concrete (RAC), both on the material and structural level. This has enabled the formulation of material and structural resistance models that can be safely and reliably used for the structural design of RAC members and the new Eurocode 2 (EC2) will contain an informative annex detailing provisions for the design of RAC. Thus, an increased market uptake of recycled aggregate (RA) can be achieved, leading to potential sustainability improvements of concrete structures. In order to familiarize designers with the new provisions for RAC, this paper presents an example of one-way slab design using varying RA substitution ratios, as well as a parametric study on the implications of RAC provisions on slab slenderness. The results of this study show that RAC one way slabs can be successfully designed using EC2. Although such slabs might require larger depths than natural aggregate concrete slabs, their applicability in the typical slenderness range is possible.
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Hallawi, Ali Faiq, and Ali Hussein Ali Al-Ahmed. "Enhancing the Behavior of One-Way Reinforced Concrete Slabs by Using Laced Reinforcement." Civil Engineering Journal 5, no. 3 (March 19, 2019): 718. http://dx.doi.org/10.28991/cej-2019-03091282.
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This paper studies experimentally the behavior of laced reinforced concrete one-way slabs under monotonic load. The experimental program included testing three simply supported one-way slabs of dimensions (1500 mm length, 600 mm width, and thickness 130mm. One of these slabs was the control specimen which was designed without lacing reinforcement steel and the other two specimens designed were with two variable lacing reinforcement ratio (0.27% and 0.52%). All specimens were cast with normal of 22 MPa compressive strength. Specimens were tested under two equal line loads applied at the third parts of the slab (monotonic load) gradually applying up to failure. The specimens showed an enhanced in ultimate load capacity up to 40% as a result of increasing the lacing steel ratio to 0.52 %. Also, decreasing in deflection at service and at ultimate load levels by 42% and %57 respectively. In addition, the results showed that specimen with lacing reinforcement are more ductility than specimen without lacing reinforcement so using of lacing steel reinforcement leads to significant improvements in ductility index which reached to about 49% with increasing the lacing steel ratio to (0.52%).
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Xu, Xin Jian, Li Juan Li, Wen Chao Zhou, Ming Min, and Feng Liu. "On-Site Test Study of RC Slabs Strengthened with CFRP and BFRP." Advanced Materials Research 163-167 (December 2010): 3782–86. http://dx.doi.org/10.4028/www.scientific.net/amr.163-167.3782.
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This paper presented the on-site test results on two-way RC slabs with and without FRP-strengthening. Two slabs strengthened with BFRP, one slab strengthened with CFRP and one slab without strengthening were tested on a practical engineering structure being repaired. The effects of different load cases on mid-span deflection, distribution of stresses around the steel bars at the top and bottom of slabs were analyzed.
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Li, Tian Hua, Jun Hai Zhao, and Xiao Ming Dong. "Numerical Simulation of One-Way Reinforced Concrete Slabs Subjected to Blast Loadings." Advanced Materials Research 671-674 (March 2013): 726–30. http://dx.doi.org/10.4028/www.scientific.net/amr.671-674.726.
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The damage and failure of reinforced concrete (RC) slabs under blast loadings may cause significant hazards for frame systems even progressive collapse of whole structures. The numerical simulation of one-way RC slabs using the finite element explicit code LS-DYNA to estimate the dynamic response and failure mode of one-way RC slabs .Blast loadings are imposed on the top surface of slabs using a blast model based on conwep algorithm. Concrete was modeled using a concrete damage constitutive model considering strain rate effect, and reinforcement was modeled using a elastoplastic material type with kinematic hardening and strain rate effect. The numerical model is introduced in details and adopted to simulate the dynamic responses of RC slabs in reference test. The numerical model can match well with the test data, and thus the proposed numerical model can be considered as a valuable tool in assessing the deformation or failure mechanism and predicting the dynamic responses of one-way RC slabs subjected to blast loadings.
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Shakir, Qasim M. "Performance of High-Strength Concrete One-Way Slabs with Embedded BFRP Bar Reinforcement." International Journal of Applied Science 1, no. 1 (July 4, 2018): p25. http://dx.doi.org/10.30560/ijas.v1n1p25.
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Since the invention of reinforced concrete, steel bars had been used as tension device to resist tensile stresses. Recently, several experimental and theoretical studies have been achieved to verify that FRP composites bars (CFRP and GFRP) may be a good competitive alternatives due to strength ,durability and weight aspects. Few studies have been published about the performance of BFRP bars in reinforced concrete simply supported or continuous slabs. Thus, In the present work, a theoretical study based of the finite element approach is achieved utilizing ANSYS-15 package to investigate the performance of the reinforced concrete one-way slabs with embedded basalt (BFRP) bars under monotonic loads. Six slabs have been considered, two were simply supported and four were continuous each with two-span. Several parameter have been studied such as continuity condition, reinforcement ratio, position of reinforcement and the effect of replacement basalt bars by steel bars.
It is concluded that slabs reinforced with BFRP bars have lower performance if compared with that reinforced with steel bar reinforcement. Also, it is found that the steel is more effective in bottom face within the midspan zone and basalt bars are inactive in top compression zone. It is found with an efficient distribution of bars that for slab with reinforcement ratio of 0.7%, the load capacity is improved by 12.5% and a reduction in max. deflection 46%. while the load capacity is improved by 61% when adopting a ratio of 1% while the max. deflection is reduced by 56%.
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Nguyen, Huy Q., Kijae Yang, and Jung J. Kim. "An Efficient Method for Optimizing HPC-FRP Retrofit Systems of Flexural Strengthened One-Way Continuous Slabs Based on ACI 440.2R." Materials 15, no. 23 (November 26, 2022): 8430. http://dx.doi.org/10.3390/ma15238430.
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An innovative retrofit system consisting of fiber-reinforced polymers (FRP) and high-performance concrete (HPC) considering the difficulty of the accessibility and installation of FRP on the underside of reinforced concrete (RC) slabs was found to be efficient in the flexural strengthening of existing RC slabs. It is important to note that continuous slabs using the FRP-HPC retrofit systems are less effective in exploiting FRP tensile strength and can cause sudden failure once excessively enhanced flexural strength exceeds shear strength. A design method to ensure ductile failure mode was also proposed for strengthened continuous RC slabs in the previous literature. Thus, it is necessary to optimize retrofit systems in terms of mechanical performance aspects to improve the efficiency of retrofitted slabs in serviceability. This study proposes a design method for optimizing the strength of materials and inducing ductile failure of continuous slab retrofitting FRP-HPC systems. The proposed approach demonstrated its effectiveness for strengthening a continuous RC slab with various FRP-HPC retrofit systems through a case study. The results show that the design factored load in the serviceability limit state does not change appreciably from a decrease in carbon fiber-reinforced polymers (CFRP) of 38%; the design factored load decreased only by 9% and the ultimate failure load by 13% while reducing CFRP by 20% and HPC by 25%.
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Zhao, Xin, Dan Dan Kong, Zhi Wei Zhang, and Mai Wu. "Study on Mechanical Behaviors of New Reinforced Concrete Hollow Floor Slab." Applied Mechanics and Materials 94-96 (September 2011): 1018–21. http://dx.doi.org/10.4028/www.scientific.net/amm.94-96.1018.
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In this paper a new type of reinforced concrete four-way rib hollow slab was proposed by the authors first. Further in order to research on the mechanical properties of the new floor slab the other two common slabs were compared with the new one, that was two-way rib hollow slab and solid slab. The rational finite element (FE) models of the three kinds of slabs supported by four corner columns were built up respectively by ANSYS. The deflection and stress of the three kinds of slabs under three load cases were calculated separately, on the basis of which thorough comparisons and analysis were carried out. The study results showed that the new reinforced concrete four-way rib hollow floor slab has superior mechanical properties.
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Al-Zaidee, Salah Rohaima. "Slab-beam Interaction in One-way Floor Systems." Journal of Engineering 24, no. 3 (March 1, 2018): 122. http://dx.doi.org/10.31026/j.eng.2018.03.10.
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This study focuses on the slab-beam interaction in one-way systems. In the context of this study, slab-beam interaction means how beam deflection can affect moment distribution in one-way slabs. This interaction is usually neglected in the traditional approximate analysis that is adopted in engineering practice and design codes. Slab positive moments have been considered as indicators on the accuracy of approximate methods, as they overestimate negative moments while underestimating positive moments.
After proposing of effecting parameters in slab-beam interaction including of panel length and width, beam dimensions, and slab thickness, Buckingham’s theorem has been adopted to transform the dimensional-model into a non-dimensional qualitative one. Different case studies with finite element models have been adopted to generate points on the proposed qualitative non-dimensional model. Finally, linear regression analyses have been adopted to develop the corresponding quantitative models.
Case studies and corresponding regression analysis indicate that non-dimensional parameters adopted in the model are related linearly with a correlation coefficient in the range of 0.97 and that an error up to 250% may be noted due to neglecting the slab-beam interaction. Therefore, a condition related to the relative stiffness of supporting beams should be added to the current conditions for the approximated methods to be more accurate and more compatible with those adopted in the analysis of two-way systems.
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Zhu, Sanfan, Yuli Dong, Sengui Ye, Dashan Zhang, and Jintao Duan. "Limit Carrying Capacity Calculation of Two-Way Slabs with Three Simply Supported Edges and One Clamped Edge under Fire." Applied Sciences 12, no. 3 (January 31, 2022): 1561. http://dx.doi.org/10.3390/app12031561.
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Fire-resistance experiments were conducted on two full-scale two-way reinforced concrete slabs with three simply supported edges and one clamped edge. This paper presents the design of the furnace, specimens and clamped-end device, the test plan, and the measuring contents and methods. The cracking and failure characteristics of the tested two-way reinforced concrete slabs were introduced. The temperature field distribution of the concrete and steel in the direction of the section thickness, out-of-plane deflections, in-plane deflections, and angle of the slab edges of the two-way concrete slab under fire conditions were analyzed. Cracks form on the slab surface, which is shaped similar to the bottom of a shallow bowl, with two transverse cracks in the mid-area of the medially clamped side and intensively annular diagonal cracks on the corner side. There were several main transverse cracks in the central area of the slab surface. The results indicate that there was a significant decrease in frequency under fire conditions. Relations between the frequency and the central vertical deflection of the two slabs were analyzed by the regression method. This research generates valuable test data that can be used to validate the numerical models developed by fellow researchers in the field of structural fire engineering. Based on the plate balance method and energy method, calculation formula of the limit carrying capacity calculation formula of reinforced concrete two-way slabs with four different boundaries under fire are given, which are simply supported on three sides and clamped on one side. The influence of membrane effect under large deflection is considered in the formula, and the calculated results are in good agreement with the experimental results.
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Amer M. Ibrahim, Nazar K. Ali, and Wissam D. Salman. "Flexural Capacities of Reinforced Concrete Two-Way Bubbledeck Slabs of Plastic Spherical Voids." Diyala Journal of Engineering Sciences 6, no. 2 (June 1, 2013): 9–20. http://dx.doi.org/10.24237/djes.2013.06202.
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This paper presents the flexural capacities of R.C two way hollow slabs of plastic spherical voids, also known as BubbleDeck slab system. Recently, various types of slab systems which can reduce the self-weight of slabs have been studied as the height and width of building structures rapidly increase (1). A biaxial hollow slab system is widely known as one of the effective slab systems which can reduce the self-weight of slabs (1). A BubbleDeck slab has a two-dimensional arrangement of voids within the slabs to reduce self-weight (2). The behavior of BubbleDeck slabs is influenced by the ratio of bubble diameter to slab thickness. To verify the flexural behavior of this BubbleDeck slab such as ultimate load, deflection, concrete compressive strain and crack pattern, two-dimensional flexural tests were tested by using special loading frame. Six test of specimens were used. Two were a conventional RC slab and four were BubbleDeck slabs having void diameter to slab thickness ratios of (0.51, 0.64 and 0.80). Results have shown that the crack pattern and flexural behavior depend on the void diameter to slab thickness ratio. The ultimate load capacities for BubbleDeck slabs having bubble diameter to slab thickness of (0.٥1 and 0.64) were the same of solid slabs, while when bubble diameter to slab thickness of (0.80) the ultimate capacities were reduced by about (10%).
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Lotfy, Ehab M., Sherif M. Elzeiny, and Alaa M. Rashad. "Flexural capacity of one-way GFRP concrete slabs." Proceedings of the Institution of Civil Engineers - Construction Materials 164, no. 3 (June 2011): 143–52. http://dx.doi.org/10.1680/coma.2011.164.3.143.
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Ahmed, M. H., Y. A. Hassaneen, Z. E. Abd El Shafy, and M. A. Farouk. "MATHEMATICAL STRUCTURAL ANALYSIS OF ONE WAY RIBBED SLABS." JES. Journal of Engineering Sciences 39, no. 4 (July 1, 2011): 761–80. http://dx.doi.org/10.21608/jesaun.2011.127702.
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Min, Chang-Shik. "Crack Control in Beams and One-Way Slabs." Journal of the Korea Concrete Institute 24, no. 4 (August 31, 2012): 381–90. http://dx.doi.org/10.4334/jkci.2012.24.4.381.
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Thoma, K., and F. Malisia. "Compressive membrane action in RC one-way slabs." Engineering Structures 171 (September 2018): 395–404. http://dx.doi.org/10.1016/j.engstruct.2018.05.051.
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Nasir, Nameer, and RAID DAUD. "Finite Element Modeling of One-Way Recycled Aggregate Concrete Slabs Strengthened using Near-Surface Mounted CFRPs under Repeated Loading." Journal of Engineering 28, no. 11 (November 1, 2022): 32–46. http://dx.doi.org/10.31026/j.eng.2022.11.03.
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This study offers numerical simulation results using the ABAQUS/CAE version 2019 finite element computer application to examine the performance, and residual strength of eight recycle aggregate RC one-way slabs. Six strengthened by NSM CFRP plates were presented to study the impact of several parameters on their structural behavior. The experimental results of four selected slabs under monotonic load, plus one slab under repeated load, were validated numerically. Then the numerical analysis was extended to different parameters investigation, such as the impact of added CFRP length on ultimate load capacity and load-deflection response and the impact of concrete compressive strength value on the structural performance of slabs. This article aims to provide a numerical model for simulating the nonlinear behavior of such slabs, including a trustworthy finite element model approach and constitutive material models. In aspects of load-deflection and cracking patterns, comparisons between computational and experimental models are provided, and a reasonable fit is demonstrated. The average ratio of numerical model ultimate load and deflections to experimentally tested slabs were 0.992 and 0.913, respectively. As a result, finite element analysis may be regarded as a preferred and trustworthy approach for simulating the non-linear behavior of one-way slabs (strengthened or not) in terms of complexity, difficulty, time savings, human effort, and money.
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Abdullah, Anas Ibrahim. "Structural Behavior of High Strength Laced Reinforced Concrete One Way Slab Exposed to Fire Flame." Civil Engineering Journal 5, no. 12 (December 1, 2019): 2747–61. http://dx.doi.org/10.28991/cej-2019-03091446.
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In this study, an experimental investigation had conducted for six high strength laced reinforced concrete one-way slabs to discover the behavior of laced structural members after being exposed to fire flame (high temperature). Self-compacted concrete (SCC) had used to achieve easy casting and high strength concrete. All the adopted specimens were identical in their compressive strength of ( , geometric layout 2000 750 150 mm and reinforcement specifics except those of lacing steel content, three ratios of laced steel reinforcement of (0.0021, 0.0040 and 0.0060) were adopted. Three specimens were fired with a steady state temperature of for two hours duration and then after the specimens were cooled suddenly by spraying water. The simply supported slabs were tested for flexure behavior with two line loads applied in the middle third of the slab (four-point bending test). The average residual percentage of cubic compression strength and splitting tensile strength were 57.5% and 50% respectively. The outcomes indicated that the residual bending strength of the burned slabs with laced ratios (0.0021, 0.004, 0.006) were (72.56, 70.54 and 70.82%) respectively. However; an increase in the deflection was gained to be (11.34, 14.67 and 17.22%) respectively with respect to non-burned specimens.
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Ewida, El-Sayed S., Rasha T. S. Mabrouk, Nasser El-Shafey, and Akram M. Torkey. "Flexural Behavior of One-Way Slabs Reinforced with Welded Wire Mesh under Vertical Loads." Civil Engineering Journal 8, no. 4 (April 1, 2022): 654–70. http://dx.doi.org/10.28991/cej-2022-08-04-03.
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This paper aims to study the behavior of one-way concrete solid slabs reinforced with welded wire mesh to investigate the efficiency of using welded wire mesh in the construction of structural slabs as a replacement for ordinary steel bars. This research included experimental and analytical programs. Nine 700×1050 mm one-way simple specimens and six 525×1050 mm continuous one-way slabs with two equal spans were tested under point, line, and uniform static loads. The experimental program studied the use of welded mesh and the number of layers utilized. Numerical analysis was conducted using finite element modeling developed using the ABAQUS 6.13 software package. Experimental and analytical results showed good correlation: the number of layers of welded metal mesh and load type significantly affected the peak vertical load capacity of simple and continuous slabs, with slabs showing higher values with welded mesh than those of ordinary reinforcing bars. In addition, using welded metal mesh to reinforce solid slabs enhanced their cracking behavior as well as their ductility. Doi: 10.28991/CEJ-2022-08-04-03 Full Text: PDF
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Tang, Jijun, and Adam S. Lubell. "Influence of longitudinal reinforcement strength on one-way slab deflection." Canadian Journal of Civil Engineering 35, no. 10 (October 2008): 1076–87. http://dx.doi.org/10.1139/l08-050.
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The CSA A23.3 standard for reinforced concrete design provides both an implicit check of deflection control based on minimum member thickness requirements and a direct computation method for deflection. This paper reports on an analytical study that compared maximum span-to-depth ratios from the implicit deflection provisions against ratios determined from direct deflection calculations. Emphasis was placed on the deflection performance of lightly reinforced one-way slabs, including those with high-strength steel reinforcement. The results indicated that maximum span-to-depth ratios should decrease as the span length increases, as the design load increases or as the cracking moment decreases. In contrast to the current implicit provisions, the design strength of the longitudinal reinforcement did not have a significant effect on the minimum slab thickness required to satisfy common deflection criterion. Design aids were proposed, with implications for design presented through a case study of a multispan one-way slab system.
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Devi Priyanka, M., and V. Ramesh. "Comparative Study on Slab Deflections." IOP Conference Series: Earth and Environmental Science 982, no. 1 (March 1, 2022): 012081. http://dx.doi.org/10.1088/1755-1315/982/1/012081.
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Abstract Slabs are one of the most common structural components in RC-framed structures, usually analysed under transverse loading. In the analysis, the thickness of the slab generally governs the serviceability requirement for deflection. The thickness of the slab controls the weight of the building since its contribution is nearly 50% of the total weight of the building. In order to minimize the weight of the building, proper analysis of the slab ensures minimum thickness satisfying deflection criteria. For a given loading, span, and assumed thickness of the slab, analysis will be performed using the material properties such as modulus of elasticity and Poisson’s ratio. Several theories, including the Rankine-Grashoff theory, Timoshenko’s plate theory, Marcus, and other methods have been proposed over the years using the same concept. These methods do not consider the participation of reinforcement in deflection estimation. IS code 456 – 2016 specifies limiting span to depth ratios with suitable modification factors based on percentage of tension reinforcement and stress level in steel for satisfactory serviceability criteria of deflection. In the present study, an attempt was made to compare the slab deflections analytically and experimentally with and without reinforcement contribution for the exactness of proposed theories. It concludes that, in one-way simply supported slabs, theoretical values differ by 45% from experimental values in reinforced concrete (RC) slabs. In two-way simply supported plain concrete (PC) slabs, the Rankine-Grashoff theory is in good agreement with the experimental values. Theoretical values of the two-way slabs when compared with experimental (RC slab) values are in good agreement with plate theory.
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Sun, Xiu Shan, Ying Hua Liu, Zhang Zhi Cen, and Dong Ping Fang. "Numerical Simulation of Deformation and Strength of Reinforced Concrete Slabs under Thermal-Mechanical Loads." Key Engineering Materials 353-358 (September 2007): 2676–80. http://dx.doi.org/10.4028/www.scientific.net/kem.353-358.2676.
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In this paper, full-scale reinforced concrete slabs are analyzed under thermal-mechanical loads in fire conditions. The rectangular one-way slabs including a simply supported slab and a three-span continuous slab are concerned in the analysis. Finite element simulation is carried out by using the ABAQUS program to evaluate the non-uniform temperature distributions in thickness of the slabs and to analyze the deformation and stress redistribution of the slabs at elevated temperatures. Sequentially coupled thermal and structural analyses are performed to simulate the responses of the slabs in fire conditions. Deformation and strength of the slabs under thermal and mechanical loads are discussed. The numerical results are compared with the experimental ones and good agreements are observed. The analysis results show that the main reinforcement ratio has significant effects on the deformation and strength of the slabs at elevated temperatures and the three-span continuous slab has better performance of fire-resistance than the simply supported slab.
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Fazaa Rajab, Omar, Ziadoon M. Ali, Akram S. Mahmoud, and Majid S. Mohammed. "Flexural Ductility, Stiffness, and Toughness of New Voided Reinforced Concrete One-Way Slab Using Waste Plastic Bottles." Journal of Engineering 2022 (August 10, 2022): 1–10. http://dx.doi.org/10.1155/2022/8672694.
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The enhancement of concrete structures’ performance can easily be achieved. However, the main challenge is how to achieve this performance with respect to the economy and sustainability. The aim of this research is to examine the flexural strength, ductility, stiffness, and toughness of RC hollow one-way slabs that are voided by plastic bottles. A new technique of hollowing has been used in this work, where a steel mesh tube was prepared previously and filled manually with blank waste plastic bottles to form a light tube. This technique has some advantages including ease of installation and adequate bonding for the main steel reinforcements. Five RC one-way slabs were cast and tested in the lab to investigate some variables: the presence of hollow, the ratio of reinforcement, and slab thickness. Briefly, a new technique for voids enhances the flexural behavior with less concrete and weight. The ductility is increased by about 100% for the voided specimens for the same section’s thickness. Also, the rotation in supports had been reduced by about 30% when the thickness of voided slab was increased by about 15%.
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Najem, Rabi M. "OPTIMUM COST DESIGN OF R. C. ONE WAY SLABS." AL-Rafdain Engineering Journal (AREJ) 18, no. 6 (December 28, 2010): 15–27. http://dx.doi.org/10.33899/rengj.2010.34788.
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., T. Geetha Kumari. "FLEXURAL CHARACTERISTICS OF SFRSCC AND SFRNC ONE WAY SLABS." International Journal of Research in Engineering and Technology 02, no. 07 (July 25, 2013): 220–29. http://dx.doi.org/10.15623/ijret.2013.0207030.
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