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Letteratura scientifica selezionata sul tema "Reinforced concrete Ductility"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 29 gennaio 2023

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Articoli di riviste sul tema "Reinforced concrete Ductility"

Galishnikova, Vera V., Paschal Chimeremeze Chiadighikaobi e Dafe Aniekan Emiri. "Comprehensive view on the ductility of basalt fiber reinforced concrete focus on lightweight expanded clay". Structural Mechanics of Engineering Constructions and Buildings 15, n. 5 (15 dicembre 2019): 360–66. http://dx.doi.org/10.22363/1815-5235-2019-15-5-360-366.

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Relevance. Ductility of basalt fiber reinforced concrete is an interesting property of basalt fiber reinforced concrete. However, very few experiments on this property is documented. The aim of the work. This paper provides a summarized analysis and review of existing publications on the ductility of lightweight basalt fiber reinforced concrete. Methods. This paper provides a comprehensive study on ductility of basalt reinforced concrete and lays the framework for proper laboratory experiment on the ductility of basalt fiber reinforced concrete. Results. From the findings of this review paper, ductility of dispersed basalt fiber reinforced concrete depends not only in the percentage of basalt fiber in the concrete but in the length and diameter of the basalt fiber. Increase in the percentage of basalt fiber in the concrete yielded an increase in the concrete ductility.

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Muralidhara Rao, Dr T., N. Srikar, G. Sukesh Reddy e B. Praveen. "Ductility of Reinforced Concrete Beams". CVR Journal of Science & Technology 9, n. 1 (1 dicembre 2015): 7–12. http://dx.doi.org/10.32377/cvrjst0902.

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Yun, Ying Wei, Qin Luo, Il Young Jang, Shan Shan Sun e Jia Wei Zhang. "Experimental Research on the Ductility of High Performance Concrete Beams". Applied Mechanics and Materials 166-169 (maggio 2012): 1316–20. http://dx.doi.org/10.4028/www.scientific.net/amm.166-169.1316.

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Ductility is important in the design of reinforced concrete structures. In seismic design of reinforced concrete members, it is necessary to allow for relatively large ductility so that the seismic energy is absorbed to avoid shear failure or significant degradation of strength even after yielding of reinforcing steels in the concrete member occurs. This paper aims to present the basic data for the ductility evaluation of reinforced HPC (high performance concrete) beams. Accordingly, 10 flexural tests were conducted on full-scale structural concrete beam specimens having concrete compressive strength of 40, 60, and 70 MPa. The test results were then reviewed in terms of flexural capacity and ductility. The effect of concrete compressive strength, tension steel ratio, and shear span to beam depth ratio on ductility were investigated experimentally.

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Hosen, Md Akter, Mahaad Issa Shammas, Sukanta Kumer Shill, Safat Al-Deen, Mohd Zamin Jumaat e Huzaifa Hashim. "Ductility Enhancement of Sustainable Fibrous-Reinforced High-Strength Lightweight Concrete". Polymers 14, n. 4 (14 febbraio 2022): 727. http://dx.doi.org/10.3390/polym14040727.

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To limit the cross-sectional size of concrete structures, high-strength, lightweight concrete is preferred for the design and construction of structural elements. However, the main drawback of high-strength, lightweight concrete is its brittleness over normal-weight concrete. The ductility of concrete is a crucial factor, which plays an important role when the concrete structures are subjected to extreme situations, such as earthquakes and wind. This study aims to improve the ductility of high-strength, lightweight concrete by incorporating steel fibers. The palm oil clinker (POC)-based, high-strength, lightweight concrete specimens reinforced with steel fibers were prepared and their ductility was systematically examined. POC was used as aggregates and supplementary cementitious materials. Steel fibers from 0–1.50% (by volume), with an increment of 0.5%, were used in the concrete mix. Compression ductility, displacement ductility and energy ductility were used as indicators to evaluate the enhancement of ductility. Moreover, the compressive strength, flexural strength, stress-strain behavior, modulus of elasticity, load-displacement characteristics, energy absorption capacity and deformability of the concrete samples were investigated. The compression ductility, displacement ductility and energy ductility indexes were found to be increased by up to 472%, 140% and 568% compared to the control specimens (concrete with 0% steel fibers), respectively. Moreover, the deformability and energy absorption capacity of the concrete were increased by up to 566% and 125%, respectively. Therefore, POC-based, high-strength, fibrous, lightweight concrete could perform better than conventional concrete under extreme loading conditions as it showed significantly higher ductility.

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Wang, Boxue, Shiping Yin e Ming Liu. "Investigation on the Displacement Ductility Coefficient of Reinforced Concrete Columns Strengthened with Textile-Reinforced Concrete". Advances in Civil Engineering 2021 (7 dicembre 2021): 1–12. http://dx.doi.org/10.1155/2021/3152619.

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To evaluate the seismic performance of reinforced concrete (RC) columns strengthened with textile-reinforced concrete (TRC), based on the ABAQUS numerical analysis results of 15 TRC-strengthened RC columns, the grey correlation theory was used to determine the input variables of the model, and the accuracy of the numerical simulation results is verified by some experiments. Then, according to FEM data, a neural network prediction model was established for the displacement ductility coefficients of TRC-strengthened columns, and a formula was proposed for calculating the displacement ductility coefficient. The results showed that the BP (backpropagation) neural network model had good rationality and accuracy and that the ductility coefficients of the strengthened columns calculated by the model agreed well with the experimental values. Therefore, the model can be applied for predicting the displacement ductility coefficients of TRC-strengthened columns and can be used as a reference for engineering design.

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Vandewalle, Lucie. "Ductility of hybrid fiber reinforced concrete". IABSE Symposium Report 92, n. 4 (1 gennaio 2006): 10–16. http://dx.doi.org/10.2749/222137806796185535.

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Bai, Z. Z., e F. T. K. Au. "Ductility of symmetrically reinforced concrete columns". Magazine of Concrete Research 61, n. 5 (giugno 2009): 345–57. http://dx.doi.org/10.1680/macr.2008.00149.

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Annamaneni, Krishna Kiran, Bhumika Vallabhbhai Dobariya e Krasnikovs Andrejs. "CONCRETE, REINFORCED BY CARBON FIBRE COMPOSITE STRUCTURE, LOAD BEARING CAPACITY DURING CRACKING". ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference 2 (17 giugno 2021): 232–37. http://dx.doi.org/10.17770/etr2021vol2.6655.

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Different authors conducted studies on fiber reinforced concretes (FRC) with carbon fibres of different lengths and some results showed that concrete mix with homogeneously distributed short fibres in their volume have good strength and ultra-strain compared to normal plain concrete mix. However, this study is focused more on 3-dimensional (3D) carbon fibre reinforced plastic (epoxy) CFRP composite thin rods frame used as a reinforcement in concrete which shows good increase in loadbearing and ductility. Were investigated concrete mixes with superplasticizer, nano-silica, quartz sand, fine natural sand and gravels. Diagonal cross bracing carbon fibre epoxy frames were used as a reinforcement giving better ductility results. Proposed study approach is to show that the reinforced concrete with provided materials have an increased performance in terms of ductility, sustainability, and load bearing in cracked statement. Total, four groups of concrete and each group with three beams were casted and tested in this experiment, three groups with three different shapes of carbon frames and three beams without frames to compare the mechanical properties after 28 days. Failure mechanisms in any particular case were analysed.

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Zhang, Xin Le, Hai Cao e Xiao Hui Guo. "Study on Compressive Stress-Strain Relationship of Polymer-Modified Concrete". Advanced Materials Research 779-780 (settembre 2013): 122–25. http://dx.doi.org/10.4028/www.scientific.net/amr.779-780.122.

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The axial compressive stress-strain relationship of concrete reflects its basic mechanical performance, which is important in analyzing the performance of materials, especially in the analyzing of the elastic modulus, ductility and carrying capacity. In order to study the mechanical properties of polymer-modified concrete and steel fiber reinforced polymer concrete, a comparative study of the compressive stress-strain relationship of polymer-modified concrete and steel fiber reinforced polymer concrete was carried out, the complete compressive stress-strain curves were obtained, and the influence of polymer and steel fiber on concrete elastic modulus and compressive ductility was also studied. It is demonstrated that the compressive ductility index of steel fiber reinforced polymer concrete can reach 7.39 which is greater than that of polymer-modified concrete with the same ingredients. The results also show that steel fiber reinforced polymer concrete is better than both polymer-modified concrete and steel fiber reinforced concrete.

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Siregar, Atur P. N. "Experimental investigation of the flexural ductility of singly reinforced concrete beam using normal and high strength concrete". Journal of Sustainable Engineering: Proceedings Series 1, n. 2 (30 settembre 2019): 218–24. http://dx.doi.org/10.35793/joseps.v1i2.30.

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This paper discusses and reports based on the experimental investigation of the flexural ductility of singly reinforced normal strength and high strength concrete beams. Compressive concrete strength of 40 and 95 MPa were employed to create singly reinforced normal strength and high strength concrete beams, respectively. Fourteen samples made of normal and high strength concrete were engaged to observe the flexural ductility behaviour of beams on the basis of four point bend testing. Analysis on the basis of the flexural cracking, ultimate failure and curvature ductility were carried out to derive the comparison of singly reinforced normal strength and high strength beams. The beams using high strength concrete revealed a higher ductility ratio than that of normal strength concrete, i.e. 4.50 for high strength concrete and 2.60 for normal strength concrete.

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Più fonti

Tesi sul tema "Reinforced concrete Ductility"

Soesianawati, M. T. "Limited ductility design of reinforced concrete columns". Thesis, University of Canterbury. Department of Civil Engineering, 1986. http://hdl.handle.net/10092/3643.

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This report describes an experimental and analytical investigation of the strength and ductility of reinforced concrete columns. Four columns of square cross-section were tested under axial compression loading and cyclic lateral loading applied at mid-height which simulated seismic loading. The main variable investigated was the quantity of transverse confining steel used, which ranged between 17 to 46 percent of the NZS 3101:1982 recommended quantity for ductile detailing. The experimental results are reported in the form of lateral loaddisplacement and lateral load-curvatures hysteresis loops, curvature profiles, transverse steel strain distributions and concrete compressive strains. The results are discussed and compared with the analytical predictions. A modified equation for the quantity of confining reinforcement in rectangular columns is recommended. Conclusions are made regarding the ductility available from columns containing substantially less transverse confining reinforcement than recommended by the New Zealand concrete design code.

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Lau, Tak-bun Denvid. "Flexural ductility improvement of FRP-reinforced concrete members". Click to view the E-thesis via HKUTO, 2006. http://sunzi.lib.hku.hk/hkuto/record/B38907756.

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Kim, SangHun Aboutaha Riyad S. "Ductility of carbon fiber-reinforced polymer (CFRP) strengthened reinforced concrete". Related Electronic Resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2003. http://wwwlib.umi.com/cr/syr/main.

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Lau, Tak-bun Denvid, e 劉特斌. "Flexural ductility improvement of FRP-reinforced concrete members". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2006. http://hub.hku.hk/bib/B38907756.

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Watson, Soesianawati. "Design of reinforced concrete frames of limited ductility". Thesis, University of Canterbury. Department of Civil Engineering, 1989. http://hdl.handle.net/10092/3745.

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An experimental programme was carried out to investigate the flexural strength and ductility. of reinforced concrete columns under simulated earthquake loading. The main variable examined was the quantity of transverse reinforcement for concrete confinement. The experimental results were described and compared with theoretical studies. It was found that to achieve adequate ductility in columns, the current New Zealand concrete design code NZS3101:1982 equations for concrete confinement need to be refined. Using design charts for ductility, which were previously derived from a theory for cyclic moment-curvature behaviour, a refined design equation to replace the current code equations is proposed. The inelastic dynamic response of frames of limited ductility was examined, and compared with the response of ductile frames. The analysis indicated that non-capacity designed frames, designed for seismic forces corresponding to a limited ductility demand, performed reasonably well. Although some plastic hinges did develop in the columns, the ductility demand was acceptable and can be achieved by appropriate detailing. As a result, some suggestions for the seismic design requirements of frames of limited ductility are presented.

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Azizi, Abdul R. "Modelling moment redistribution in continuous reinforced concrete beams". Thesis, Durham University, 1996. http://etheses.dur.ac.uk/1578/.

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Zaina, Mazen Said Civil &amp Environmental Engineering Faculty of Engineering UNSW. "Strength and ductility of fibre reinforced high strength concrete columns". Awarded by:University of New South Wales. School of Civil and Environmental Engineering, 2005. http://handle.unsw.edu.au/1959.4/22054.

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The main structural objectives in column design are strength and ductility. For higher strength concretes these design objectives are offset by generally poor concrete ductility and early spalling of the concrete cover. When fibres are added to the concrete the post peak characteristics are enhanced, both in tension and in compression. Most of the available experimental data, on fibre reinforced concrete and fibre reinforced high strength concrete columns, suggest that an improvement in both ductility and load carrying capacity due to the inclusion of the fibres. In this thesis the ductility and strength of fibre reinforced high strength concrete are investigated to evaluate the effect of the different parameters on the performance of columns. The investigation includes both experimental and the numerical approaches with 56 high strength fibre reinforced concrete columns being tested. The concrete strength ranged between 80 and 100 MPa and the columns were reinforced with 1, 2 or 2.6 percent, by weight, of end hooked steel fibres. The effect of corrugated Polypropylene fibres on the column performance was also examined. No early spalling of the cover was observed in any of the steel fibre reinforced column tested in this study. A numerical model was developed for analysis of fibre and non-fibre reinforced eccentrically loaded columns. The column is modelled as finite layers of reinforced concrete. Two types of layers are used, one to represent the hinged zone and the second the unloading portion of the column. As the concrete in the hinged layers goes beyond the peak for the stress verus strain in the concrete the section will continue to deform leading to a localised region within a column. The numerical model is compared with the test data and generally shows good correlation. Using the developed model, the parameters that affect ductility in fibre-reinforced high strength concrete columns are investigated and evaluated. A design model relating column ductility with confining pressure is proposed that includes the effects of the longitudinal reinforcement ratio, the loading eccentricity and the fibre properties and content and design recommendations are given.

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Davies, Paul. "Ductility and Deformability of FRP Strengthened Reinforced Concrete Structures". Thesis, University of South Wales, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.517957.

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Wassouf, Mohamad. "Bond and ductility of concrete reinforced with various steel bars surface and ductility conditions". Thesis, University of Birmingham, 2015. http://etheses.bham.ac.uk//id/eprint/6272/.

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Reinforced concrete is a wide field for researches and studies in civil engineering subject. It is due to the fact that reinforced concrete is the most widely used material for the infrastructure in the world. Reinforced concrete consists of two main materials: reinforcing steel and concrete, each of those two materials has its own effect on the performance of the structure. In this thesis, the change in RC performance due to different steel properties and specifications will be investigated. The study focuses on the bond interaction between steel and concrete and the flexural behaviour of RC beams. Pull-out forces have been exerted on the reinforcing bars in RC blocks to examine the impact of steel properties on the bond strength and failure mode of the blocks. In addition to that, flexural tests have been conducted on simply supported RC beams to investigate how reinforcement properties can affect the ductility of reinforced concrete. Comparison of results of the previous two tests with codes and analytical models have been carried out to verify the outcome of this research.

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Ho, Yin Bon. "Enhancing the ductility of non-seismically designed reinforced concrete shear walls /". View abstract or full-text, 2006. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202006%20HO.

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Più fonti

Libri sul tema "Reinforced concrete Ductility"

Dhakal, Rajesh P. Curvature ductility of reinforced concrete plastic hinges: Assessment of curvature limits for different forms of plastic hinges in reinforced concrete structures. Saarbrücken: VDM, Verlag Dr. Müller, 2008.

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Fuentès, Albert. Reinforced concrete after cracking: State of service ultimate limit state, ductility failure mechanism of hyperstatic structures. 2^a ed. Rotterdam: A.A. Balkema, 1995., 1995.

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Ozyildirim, H. Celik. Exploratory investigation of high-performance fiber-reinforced cementitious composites for crack control. Charlottesville, Va: Virginia Transportation Research Council, 2008.

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Ductility of reinforced concrete structures. Lausanne: Comité Euro-International du Béton, CEB, 1998.

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Monica, Starnes, e National Institute of Standards and Technology (U.S.), a cura di. Strength and ductility of concrete beams reinforced with carbon FRP and steel. Gaithersburg, MD: U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology, 2001.

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Kuchma, Daniel A. The influence of T-headed bars on the strength and ductility or reinforced concrete wall elements. 1996.

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Oehlers, Deric, e Rudolph Seracino. Design of FRP and Steel Plated RC Structures: Retrofitting Beams and Slabs for Strength, Stiffness and Ductility. Elsevier Science, 2004.

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Design of FRP and Steel Plated RC Structures: Retrofitting Beams and Slabs for Strength, Stiffness and Ductility. Elsevier Science, 2004.

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Capitoli di libri sul tema "Reinforced concrete Ductility"

Van Gysel, Ann, Tom Molkens e Inge Deygers. "Ductility of Heavily Reinforced Concrete Beams". In High Tech Concrete: Where Technology and Engineering Meet, 553–60. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-59471-2_66.

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Kollerathu, Jacob Alex. "Curvature Ductility of Reinforced Masonry Walls and Reinforced Concrete Walls". In Lecture Notes in Civil Engineering, 9–23. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-2826-9_2.

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Hsu, Thomas T. C. "Shear Ductility and Energy Dissipation of Reinforced Concrete Walls". In Infrastructure Systems for Nuclear Energy, 185–202. Chichester, UK: John Wiley & Sons, Ltd, 2013. http://dx.doi.org/10.1002/9781118536254.ch12.

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Frangou, Michael, e Kypros Pilakoutas. "Effect of spalling on reinforced concrete strength and ductility". In European Seismic Design Practice, 435–41. London: Routledge, 2022. http://dx.doi.org/10.1201/9780203756492-65.

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Šušteršič, Jakob, Rok Ercegovič, David Polanec e Andrej Zajc. "Ductility of the Four-Year-Old Steel Fibre Reinforced Concrete". In RILEM Bookseries, 290–300. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-58482-5_27.

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Scott, R. H., e P. A. T. Gill. "A Preliminary Investigation of Reinforcement Ductility in Reinforced Concrete Slabs". In Applied Stress Analysis, 506–15. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0779-9_48.

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Akbar, Sohaib, F. Michael Bartlett e A. Maged Youssef. "Flexural Ductility of Concrete Beams Reinforced with High Strength Steel". In Lecture Notes in Civil Engineering, 613–26. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-1004-3_51.

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Wenk, Thomas, e Hugo Bachmann. "Ductility demand of 3-D reinforced concrete frames under seismic excitation". In Structural Dynamics, 537–41. London: Routledge, 2022. http://dx.doi.org/10.1201/9780203738085-79.

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Dancygier, Avraham N., e Erez Berkover. "Effect of Steel Fibers on the Flexural Ductility of Lightly Reinforced Concrete Beams". In Innovative Materials and Techniques in Concrete Construction, 197–207. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-1997-2_12.

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Suthar, Jahanvi M., Antariksh Mohaniya e Sharadkumar P. Purohit. "Effect of Ductility on Performance of Reinforced Concrete Portal Frame Loaded with Lateral Load". In Lecture Notes in Civil Engineering, 3–11. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-64594-6_1.

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Atti di convegni sul tema "Reinforced concrete Ductility"

Si, Lin Jun, Guo Qiang Li e Fei Fei Sun. "Ductility Calculation of Reinforced Concrete Shear Walls". In 7th International Conference on Tall Buildings. Singapore: Research Publishing Services, 2009. http://dx.doi.org/10.3850/9789628014194_0015.

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"Compressive Strength and Ductility of Steel Fiber Reinforced Concrete". In SP-182: Structural Applications of Fiber Reinforced Concrete. American Concrete Institute, 1999. http://dx.doi.org/10.14359/5527.

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Al-Naimi, Hasanain, e Ali Abbas. "DUCTILITY OF STEEL-FIBRE-REINFORCED RECYCLED LIGHTWEIGHT CONCRETE". In 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering Methods in Structural Dynamics and Earthquake Engineering. Athens: Institute of Structural Analysis and Antiseismic Research School of Civil Engineering National Technical University of Athens (NTUA) Greece, 2019. http://dx.doi.org/10.7712/120119.7203.19035.

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"Ductility Index and Durability in Fiber-Reinforced Concrete". In SP-326: Durability and Sustainability of Concrete Structures (DSCS-2018). American Concrete Institute, 2018. http://dx.doi.org/10.14359/51711042.

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"On the Post-Peak Ductility of Shear-Critical Beams". In SP-237: Finite Element Analysis of Reinforced Concrete Structures. American Concrete Institute, 2006. http://dx.doi.org/10.14359/18249.

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"Glass Fiber Reinforced Concrete With Improved Ductility and Long Term Properties". In SP-146: Thin Reinforced Concrete Products and Systems. American Concrete Institute, 1994. http://dx.doi.org/10.14359/4323.

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Sheikh, Shamim Ahmed, e Zahra Kharal. "Corrosion-resistant Reinforced Concrete Columns". In IABSE Conference, Kuala Lumpur 2018: Engineering the Developing World. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2018. http://dx.doi.org/10.2749/kualalumpur.2018.0946.

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<p>To address this issue of corrosion of steel in reinforced concrete, large scale columns reinforced with glass fibre reinforced polymer (GFRP) bars were tested under simulated earthquake loads. In addition to the moment - curvature and shear - deflection responses, ductility factors, and work and energy dissipation parameters were used to evaluate column performance. Twenty-five columns with circular and square sections can be compared to investigate variables such as axial load level, amount and type of reinforcement, i.e. GFRP vs steel. GFRP-reinforced columns were found to behave with stable post-peak response and achieved high levels of deformability and energy dissipation. The optimum solution with respect to column strength, stiffness, ductility and energy dissipation, and corrosion resistance appears to be a hybrid column with steel longitudinal bars and GFRP transverse reinforcement.</p>

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Zhou, Mi, e Yongcun Jiang. "Analysis of Factors Affecting Ductility of Reinforced Concrete Column". In 2018 3rd International Conference on Smart City and Systems Engineering (ICSCSE). IEEE, 2018. http://dx.doi.org/10.1109/icscse.2018.00065.

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"Performance Evaluation of Fiber Reinforced Polymer Reinforcing Bar Featuring Ductility and Health Monitoring Capability". In SP-188: 4th Intl Symposium - Fiber Reinforced Polymer Reinforcement for Reinforced Concrete Structures. American Concrete Institute, 1999. http://dx.doi.org/10.14359/5608.

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Ali, Ziadoon M., Akram S. Mahmoud e Mustafa M. Al-Ani. "Ductility, stiffness and toughness of modified spliced steel reinforced concrete". In 3RD INTERNATIONAL SCIENTIFIC CONFERENCE OF ALKAFEEL UNIVERSITY (ISCKU 2021). AIP Publishing, 2022. http://dx.doi.org/10.1063/5.0067147.

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Rapporti di organizzazioni sul tema "Reinforced concrete Ductility"

Duthinh, Dat, e Monica Starnes. Strength and ductility of concrete beams reinforced with carbon FRP and steel. Gaithersburg, MD: National Institute of Standards and Technology, 2001. http://dx.doi.org/10.6028/nist.ir.6830.

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Ragalwar, Ketan, William Heard, Brett Williams, Dhanendra Kumar e Ravi Ranade. On enhancing the mechanical behavior of ultra-high performance concrete through multi-scale fiber reinforcement. Engineer Research and Development Center (U.S.), settembre 2021. http://dx.doi.org/10.21079/11681/41940.

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Abstract (sommario):

Steel fibers are typically used in ultra-high performance concretes (UHPC) to impart flexural ductility and increase fracture toughness. However, the mechanical properties of the steel fibers are underutilized in UHPC, as evidenced by the fact that most of the steel fibers pull out of a UHPC matrix largely undamaged during tensile or flexural tests. This research aims to improve the bond between steel fibers and a UHPC matrix by using steel wool. The underlying mechanism for fiber-matrix bond improvement is the reinforcement of the matrix tunnel, surrounding the steel fibers, by steel wool. Single fiber pullout tests were performed to quantify the effect of steel wool content in UHPC on the fiber-matrix bond. Microscopic observations of pulled-out fibers were used to investigate the fiber-matrix interface. Compared to the control UHPC mixture with no steel wool, significant improvement in the flexural behavior was observed in the UHPC mixtures with steel wool. Thus, the addition of steel wool in steel fiber-reinforced UHPC provides multi-scale reinforcement that leads to significant improvement in fiber-matrix bond and mechanical properties of UHPC.

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EXPERIMENTAL AND NUMERICAL INVESTIGATION ON SEISMIC PERFORMANCE OF RING-BEAM CONNECTION TO GANGUE CONCRETE FILLED STEEL TUBULAR COLUMNS. The Hong Kong Institute of Steel Construction, marzo 2022. http://dx.doi.org/10.18057/ijasc.2022.18.1.9.

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Abstract (sommario):

This paper presents an investigation on seismic performance of a ring-beam connection that is used to connect reinforced gangue concrete (RGC) beam to coal-gangue concrete-filled steel tubular (GCFST) column. Two specimens, including an interior connection with two beams and an exterior connection with one beam, were designed and fabricated for experimental tests under full-reversing cyclic loads at beam ends. In addition, finite element models which corresponded to tested specimens were developed using ABAQUS to conduct numerical simulations of the composite connection subjected to the combined axial and cyclic loads. The feasibility of the developed model to predict failure modes and load-deformation response of the connection was validated by comparing with test results. The response of the ring-beam connection to cyclic loads was examined with respects to the load-bearing capacity, deformation resistance, stiffness and strength degradation, ability to dissipate energy in a seismic event, and ductility. With numerical models, parametric analysis was completed to evaluate the influences of material and structural parameters on connection resistance against cyclic loads. Based on the results of parametric studies, a restoring force model of skeleton curve for the ring-beam connection was developed in terms of ultimate capacity and corresponding deformation. The results provided practical suggestions for the application of ring-beam connection to GCFST column in the projects.

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