Articoli di riviste: "Reinforced concrete Ductility"

1

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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Mo, Y. L., e S. F. Perng. "Behavior of Framed Shearwalls Made of Corrugated Steel under Lateral Load Reversals". Advances in Structural Engineering 3, n. 3 (luglio 2000): 255–62. http://dx.doi.org/10.1260/1369433001502184.

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Reinforced concrete buildings with shearwalls are very efficient to resist earthquake disturbances. In general, reinforced concrete frames are governed by flexure and low-rise shearwalls are governed by shear. If a structure includes both frames and shearwalls, it is generally governed by shearwalls. However, the ductility of ordinary reinforced concrete framed shearwalls is very limited. The experiments on framed shearwalls made of corrugated steel was recently reported. It was found that the ductility of framed shearwalls can be greatly improved if the thickness of the corrugated steel wall is appropriate to the surrounding reinforced concrete frame. If the thickness of the corrugated steel wall is too large when compared to the surrounding frame, the ductility will be reduced. It is shown in this paper that the fiber-reinforced plastic composites can be used to strengthen the critical regions of the reinforced concrete frames, so that the seismic behavior (including ductility and energy dissipation capability) is greatly improved.

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Yang, Lin Hu, Han Zhu e Apostolos Fafitis. "Curvature Ductility of Singly Reinforced CRC Beams (Part-II)". Advanced Materials Research 168-170 (dicembre 2010): 2111–15. http://dx.doi.org/10.4028/www.scientific.net/amr.168-170.2111.

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This article (Part-II) continues the work of a previous article (Part-I). It undertakes a theoretical analysis of the curvature ductility factor (CDF) of a singly reinforced CRC (crumb rubber concrete) beam and demonstrates how CRC’s material ductility is transformed into structural ductility of a reinforced CRC beam. The result shows that CDF for a reinforced CRC beam is much higher than that for a conventional concrete reinforced beam.

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Zhao, Jun, Li Jun Wang e Dan Ying Gao. "Non-Linear FEM Analysis of Steel Fiber Reinforced Concrete Shearwall". Advanced Materials Research 163-167 (dicembre 2010): 1551–54. http://dx.doi.org/10.4028/www.scientific.net/amr.163-167.1551.

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The numerical simulation by nonfinear finite element method(FEM) was adopted to analyze the behavior and the influences of the fraction of steel fiber by volume fraction and the strength of steel fiber reinforced concrete on the bearing capacity and the ductility of reinforced concrete shearwalls. The results show that with the increase of the fraction of steel fiber by volume fraction, the bearing capacity and ductility coefficient of steel fiber reinforced concrete shearwalls increase gradually. With the increase of the strength of steel fiber reinforced concrete, the bearing capacity and ductility coefficient of steel fiber reinforced concrete shearwalls decrease. It proves the rationality of the unit type, stress-strain relation of material and failure criteria used in the finite element analysis model.

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Rakhshanimehr, Mehrollah, M. Reza Esfahani, M. Reza Kianoush, B. Ali Mohammadzadeh e S. Roohollah Mousavi. "Flexural ductility of reinforced concrete beams with lap-spliced bars". Canadian Journal of Civil Engineering 41, n. 7 (luglio 2014): 594–604. http://dx.doi.org/10.1139/cjce-2013-0074.

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In this paper, the flexural ductility of lap-spliced reinforced concrete (RC) beams is experimentally investigated. Twenty-four specimens were designed and manufactured for laboratory experiments. Concrete compressive strength, amount of transverse reinforcement over the splice length, and the diameter of longitudinal bars were selected as the main variables. The ductility of tested specimens is evaluated based on a previously defined ductility ratio. Results show that concrete strength and amount of transverse reinforcement over the splice have major effects on ductility. With an appropriate amount of transverse reinforcement, a satisfactory ductility response for different concrete strengths can be obtained. The CSA-A23.3-04 Standard provisions on bond strength and ductility of lap-spliced RC beams are evaluated and discussed. This study shows that the provisions in predicting the bond strength of lap-spliced concrete beams are adequate but may not achieve a satisfactory performance for ductility. An equation is proposed to achieve the appropriate ductility.

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Deng, Shao Yu, e Rong Zong. "Study of Reinforced Concrete Bridge Column Ductility Based on VB". Applied Mechanics and Materials 368-370 (agosto 2013): 1410–14. http://dx.doi.org/10.4028/www.scientific.net/amm.368-370.1410.

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Because of the complexity of the ductility of reinforced concrete bridge columns test operation, the paper compiles VB application procedure to study the anti-earthquake ductility of reinforced concrete bridge columns.The experimental data in the test of concrete bridge piers and the caculation value of VB are compared, which agree very well. Therefore,feasibility of VB procedure to analysis the ductility of bridge columns is proved.

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Malla, Prafulla B., Hong Zhou e Yi Che. "Cyclic Flexural Behavior of Reinforced Concrete Beams". E3S Web of Conferences 38 (2018): 03022. http://dx.doi.org/10.1051/e3sconf/20183803022.

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The present study aims at investigating the cyclic flexural behavior of reinforced concrete beams with varying depths. Five reinforced concrete beams with beam depth ranging from 250 mm to 750 mm were tested under reversed cyclic loading and the influence of beam depth on the flexural strength and ductility of reinforced concrete beams was investigated. In addition, OpenSees was used to model the test specimens and the analytical results were compared with the experimental reuslts. It is shown that there is no apparent size effect on the normalized ultimate flexural strength of the tested beams, while for the displacement ductility factor, a significant size effect is observed. Load-deflection hysteric curves of test specimens obtained by the fiber-based element of OpenSees with Concrete03 and Hysteric models are in good agreement with those from experimental tests.

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Xu, Ling, Xiang Yu e Zhen Yu Di. "Experimental Study of CFRP Reinforced Concrete Beams". Applied Mechanics and Materials 578-579 (luglio 2014): 1271–75. http://dx.doi.org/10.4028/www.scientific.net/amm.578-579.1271.

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Through strengthening experiment of four limit damage reinforced concrete beams by CFRP, the performance index of the carrying capacity, the stiffness and the ductility compared with before strengthening of reinforced concrete beams, and analyzed before and after reinforcement. It shows that the ultimate load, the stiffness and the ductility of limit damage reinforced concrete beams by CFRP have different degrees of increase and can be widely used in practical engineering.

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Zhang, Shao Wu, Geng Biao Zhang e Ying Chuan Chen. "Experimental Study on Reinforced Concrete Framework that Reinforced by Steel Tube Concrete Wing Wall". Advanced Materials Research 1079-1080 (dicembre 2014): 22–27. http://dx.doi.org/10.4028/www.scientific.net/amr.1079-1080.22.

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In order to verify the feasibility of a new overallseismic reinforcement method of the framework. Firstly，carried low cyclic loading tests on reinforcedconcrete framework, then reinforced the framework with a new method, and repeatthe low cyclic loading tests , finally, compared and analyzed the data from twotests. Compared with the original framework, the shape of the hysteresis curveis more full and the skeleton curve of the parallel period is longer andthe ductility factor increased by 35% and the bearing capacity increased by 40%.The results show that reinforcement framework has better energy dissipationcapacity, ductility and transgender capacity.

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Wang, Zuohu, Zhanguang Gao, Yuan Yao e Weizhang Liao. "Experimental investigation on the seismic behavior of concrete beams with prestressing carbon fiber reinforced polymer tendons". Science Progress 103, n. 1 (1 novembre 2019): 003685041988523. http://dx.doi.org/10.1177/0036850419885235.

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Seven prestressed concrete beams and one normal concrete beam were tested to study the seismic performance of concrete beams with prestressing carbon fiber reinforced polymer tendons. The failure modes, hysteretic curves, ductility, stiffness degeneration, and energy dissipation capacity were studied systematically. This study shows that the partial prestressing ratio is the main factor that affects the seismic performance of carbon fiber reinforced polymer prestressed concrete beams. The beam is more resilient to seismic loads as the partial prestressing ratio decreases. Under the same partial prestressing ratio value, the energy dissipation capacity of prestressed concrete beams with unbonded carbon fiber reinforced polymer tendons was better than that of prestressed beams with bonded carbon fiber reinforced polymer tendons. When combining both bonded and unbonded prestressing carbon fiber reinforced polymer tendons, the ductility index of concrete beams was improved. Compared with that of fully unbonded and fully bonded carbon fiber reinforced polymer prestressed concrete beams, the ductility index of concrete beams with combined bonded and unbonded prestressing tendons increased by 26% and 12%, respectively.

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Renić, Tvrtko, e Tomislav Kišiček. "Ductility of Concrete Beams Reinforced with FRP Rebars". Buildings 11, n. 9 (21 settembre 2021): 424. http://dx.doi.org/10.3390/buildings11090424.

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Concrete beams reinforced with FRP rebars have greater durability than standard steel reinforced elements. The main disadvantage of using FRP rebars is the low ductility of elements which may be unacceptable in certain situations. There are several different ways of increasing the ductility of concrete elements, which are analyzed in this paper. They are compared based on efficiency, influence on durability and ease of construction. Less analyzed and tested methods are given more attention to try and expand the current knowledge and possibilities. For methods that lack experimental data, theoretical analysis is undertaken to assess the possible influence of that method on the increase in ductility. Ductility was obtained by calculating bending moment–curvature diagrams of cross sections for different reinforcement layouts. One method that lacks experimental data is confining the compressive area of beams with tensile FRP reinforcement. Theoretical analysis showed that confining the compressive area of concrete can significantly increase the ductility and bending capacity of beams. Since experimental data of beams reinforced with FRP rebars in tension and confined compressive area is sparse, some suggestions on the possible test setups are given to validate this theoretical analysis. Concrete beams reinforced with FRP can be detailed in such a way that they have sufficient ductility, but additional experimental research is needed.

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Al-Azawi, Thamir K., Raad K. Al-Azawi e Teghreed H. Ibrahim. "Curvature Ductility of Reinforced Concrete Column Sections Under Different strain Rates". Tikrit Journal of Engineering Sciences 13, n. 2 (30 giugno 2006): 67–92. http://dx.doi.org/10.25130/tjes.13.2.04.

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This paper presents theoretical parametric study of the curvature ductility capacity for reinforced concrete column sections. The study considers the behavior of concrete and reinforcing steel under different strain rates. A computer program has been written to compute the curvature ductility taking into account the spalling in concrete cover. Strain rate sensitive constitutive models of steel and concrete were used for predicting the moment-curvature relationship of reinforced concrete columns at different rate of straining. The study parameters are the yield strength of main reinforcement, yield strength of transverse reinforcement, compressive strength of concrete, spacing of ties and the axial load. The results indicated that higher strain rates improve both the curvature ductility and the moment capacity of reinforced concrete column sections.

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Lan, Feng, Qian Li, Zhuo Yi Chen e Wen Gang Ma. "Experimental Study on Seismic Performance of Fiber Reinforced Concrete Pier". Applied Mechanics and Materials 353-356 (agosto 2013): 1791–95. http://dx.doi.org/10.4028/www.scientific.net/amm.353-356.1791.

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In order to study the seismic performance of fiber reinforced concrete pier, four scaled piers whose material is reinforced concrete (RC), carbon fiber reinforced concrete (CFRC), polypropylene fiber reinforced concrete (PPFRC) and hybrid fiber reinforced concrete (HFRC) respectively have been tested under dynamic and static hydraulic servo testing system. The hysteretic curves, dissipating capability, residual deformation and ductility of each specimen are compared and studied. Experimental results indicate that the residual deformation of specimen PPFRC is not as good as CFRC, but it has well ductility. The specimen HFRC possesses the characteristic of small residual deformation and well performance of material dissipation and restoration ability. The dissipating ability of HFRC, CFRC and PPFRC are increase by 12%, 8% and 6% respectively as compared with RC. The HFRC has the best seismic performance due to small residual deformation, good restoration ability and ductility.

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Xiang, Ping, ZH Deng, YS Su, HP Wang e YF Wan. "Experimental investigation on joints between steel-reinforced concrete T-shaped column and reinforced concrete beam under bidirectional low-cyclic reversed loading". Advances in Structural Engineering 20, n. 3 (29 luglio 2016): 446–60. http://dx.doi.org/10.1177/1369433216653841.

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Steel-reinforced concrete T-shaped column-beam structure system has superiorities of both steel-reinforced structure and special-shaped column structure. This research focuses on steel-reinforced concrete T-shaped column-beam joint design and experimentally investigates seismic behaviors of the proposed joints. Pseudo-static tests are carried out on three steel-reinforced concrete T-shaped column-reinforced concrete beam joints and one reinforced concrete T-shaped column-reinforced concrete beam joint. The experiments were conducted under bidirectional low-cyclic reversed loading to simulate realistic loading conditions under earthquake. Hysteresis loops of all the specimens, including load–deflection, moment–rotation, and load–shear deformation loops, are plotted for the evaluation of seismic reaction. The working index, ductility coefficient, and equivalent viscous-damping coefficient are calculated for comparisons. Meanwhile, the ductility, capacity of energy dissipation, stiffness degradation, and the function of steel reinforcement in resisting shear force in the joint core area are intensively studied. Based on experimental results, this research analyzes shear-resistant capacity and the inner force transmission in these joints. It is found that the steel-reinforced concrete T-shaped column-reinforced concrete beam joint performs well under seismic conditions; moreover, shear-resistant capacity, ductility, and reliability are satisfactory. Conclusions derived from this research are useful for engineering practice.

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Zhao, Jun, Li Jun Wang e Dan Ying Gao. "Load and Deformation Properties of Steel Fiber Reinforced Concrete ShearWall". Applied Mechanics and Materials 69 (luglio 2011): 23–27. http://dx.doi.org/10.4028/www.scientific.net/amm.69.23.

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The numerical simulation by nonlinear finite element method(FEM) was adopted to analyze the behavior and the influences of the volume fraction of steel fibers and the strength of steel fiber reinforced concrete on the load capacity and the deformation performance of reinforced concrete shearwalls.The effect of steel fiber on the FEM was determined. The results show that with the increase of the volume fraction of steel fibers, the crack load, bearing capacity and ductility coefficient of steel fiber reinforced concrete shearwalls increase gradually. With the increase of the strength of steel fiber reinforced concrete, the bearing capacity and ductility coefficients of steel fiber reinforced concrete shearwalls decrease.

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Choi. "Evaluation of Ductility in Reinforced Concrete Members Using Material Models in Eurocode2". Journal of the Korean Society of Civil Engineers 35, n. 2 (2015): 287. http://dx.doi.org/10.12652/ksce.2015.35.2.0287.

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Yuan, Fang, Liping Chen, Mengcheng Chen e Kaicheng Xu. "Behaviour of Hybrid Steel and FRP-Reinforced Concrete—ECC Composite Columns under Reversed Cyclic Loading". Sensors 18, n. 12 (2 dicembre 2018): 4231. http://dx.doi.org/10.3390/s18124231.

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Fibre-reinforced polymer (FRP) is used widely in concrete structures owing to its noncorrosive, light-weight, nonmagnetic, and high tensile-strength properties. However, the FRP-reinforced concrete flexural member exhibits low ductility owing to the linear–elastic property of FRP reinforcement. Hybrid steel—FRP-reinforced concrete members exhibit good strength and ductility under flexure owing to the inelastic deformation of steel reinforcement. The existing investigations have focused on the mechanical behaviours of the hybrid steel—FRP-reinforced flexural members. Only few studies have been reported on the members under combined flexural and compression loads, such as columns, owing to the poor compressive behaviour of FRP bars. We herein propose a new type of hybrid steel—FRP-reinforced concrete—engineered cementitious composite (ECC) composite column with ECC applied to the plastic hinge region and tested it under reversed cyclic loading. The hybrid steel—FRP-reinforced concrete column was also tested for comparison. The influence of matrix type in the plastic hinge region on the failure mode, crack pattern, ultimate strength, ductility, and energy dissipation capacity, of the columns were evaluated systematically. We found that the substitution of concrete with ECC in the plastic hinge zone can prevent the local buckling of FRP bars efficiently, and subsequently improve the strength and ductility of the column substantially.

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Askarizadeh, N., e M. R. Mohammadizadeh. "Numerical Analysis of Carbon Fiber Reinforced Plastic (CFRP) Shear Walls and Steel Strips under Cyclic Loads Using Finite Element Method". Engineering, Technology & Applied Science Research 7, n. 6 (18 dicembre 2017): 2147–55. http://dx.doi.org/10.48084/etasr.1279.

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Reinforced concrete shear walls are the main elements of resistance against lateral loads in reinforced concrete structures. These walls should not only provide sufficient resistance but also provide sufficient ductility in order to avoid brittle fracture, particularly under strong seismic loads. However, many reinforced concrete shear walls need to be stabilized and reinforced due to various reasons such as changes in requirements of seismic regulations, weaknesses in design and execution, passage of time, damaging environmental factors, patch of rebar in plastic hinges and in some cases failures and weaknesses caused by previous earthquakes or explosion loads. Recently, Fiber Reinforced Polymer (FRP) components have been extensively and successfully used in seismic improvement. This study reinforces FRP reinforced concrete shear walls and steel strips. CFRP and steel strips are evaluated by different yield and ultimate strength. Numerical and experimental studies are done on walls with scale 1/2. These walls are exposed to cyclic loading. Hysteresis curves of force, drift and strain of FRP strips are reviewed in order to compare results of numerical work and laboratory results. Both numerical and laboratory results show that CFRP and steel strips increase resistance, capacity and ductility of the structure.

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Xiao, Xiao, Zhao Hui Li, Sheng Bo Liu e Qiong Fang Wu. "Proportion of High-Strength Steel Bars in Reinforced Concrete Ductile Piers". Advanced Materials Research 838-841 (novembre 2013): 605–10. http://dx.doi.org/10.4028/www.scientific.net/amr.838-841.605.

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This paper mainly focuses on the affect factors of ductility of reinforced concrete pier with the high-strength longitudinal reinforcement and stirrups. By finite element software ANSYS, changed the amount of longitudinal reinforcement and high-strength stirrups in the piers, the ductility performance of concrete piers was studied. The results show that under certain conditions, the ductility coefficient of concrete piers with high-strength reinforcement can increase with the amount of stirrups. In addition, high-strength longitudinal reinforcement can improve the ductility performance of the concrete piers, but it should be controlled in a reasonable range. If there are too much high-strength longitudinal reinforcement in the concrete piers, the ductility performance will be lower, and structural seismic performance will also be affected.

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Scarpitti, Nicholas, Nicholas Gavio, Alexander Pol e Seyed Hamid Reza Sanei. "Recycling Unrecycled Plastic and Composite Wastes as Concrete Reinforcement". Journal of Composites Science 7, n. 1 (5 gennaio 2023): 11. http://dx.doi.org/10.3390/jcs7010011.

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The land disposal of waste material is a major environmental threat, and recycling efforts must be exponentially improved to mitigate it. In this paper, a feasibility study was conducted to reinforce concrete with waste materials that are not typically recycled. Compression testing was performed to evaluate the mechanical properties of the concrete specimens. The results were compared with a conventional wire mesh reinforcement used in concrete. Alternative reinforcements that are typically disposed of in landfill were used, namely, plastic regrind, carbon fiber scraps, tempered glass, coarse aggregates, and wire mesh. For each reinforcement type, four specimens were manufactured to evaluate the consistency of the results. Cylindrical specimens with ASME standard dimensions of 10.16 cm × 20.32 cm were tested using a Tinius-Olsen compression testing machine after seven days of curing. A constant strain rate of 0.25 MPa/s was applied until a load drop of 30% was detected. The results show that, while the recycled reinforcements had lower compressive strengths than the wire mesh, they maintained a load-carrying capacity of more than 80%. A major improvement was observed in terms of the ductility and toughness of the reinforced concretes. The recycled-carbon-fiber-reinforced specimens showed 12% strain at failure, a major improvement in concrete ductility. The findings of this research indicate that such recycled particles and fibers without any post-processing can be used in the reinforcement of concrete, with a significant improvement in ductility.

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30

Galishnikova, Vera V., Alireza Heidari, Paschal C. Chiadighikaobi, Adegoke Adedapo Muritala e Dafe Aniekan Emiri. "Ductility and flexure of lightweight expanded clay basalt fiber reinforced concrete slab". Structural Mechanics of Engineering Constructions and Buildings 17, n. 1 (15 dicembre 2021): 74–81. http://dx.doi.org/10.22363/1815-5235-2021-17-1-74-81.

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Relevance. The load on a reinforced concrete slab with high strength lightweight aggregate concrete leads to increased brittleness and contributes to large deflection or flexure of slabs. The addition of fibers to the concrete mix can improve its mechanical properties including flexure, deformation, toughness, ductility, and cracks. The aims of this work are to investigate the flexure and ductility of lightweight expanded clay concrete slabs reinforced with basalt fiber polymers, and to check the effects of basalt fiber mesh on the ductility and flexure. Methods. The ductility and flexural/deflection tests were done on nine engineered cementitious composite (expanded clay concrete) slabs with dimensions length 1500 mm, width 500 mm, thickness 65 mm. These nine slabs are divided in three reinforcement methods types: three lightweight expanded clay concrete slab reinforced with basalt rebars 10 mm (first slab type); three lightweight expanded clay concrete slab reinforced with basalt rebars 10 mm plus dispersed chopped basalt fiber plus basalt fiber polymer (mesh) of cells 2525 mm (second slab type); three lightweight expanded clay concrete slab reinforced with basalt rebars 10 mm plus dispersed basalt fiber of length 20 mm, diameter 15 m (third slab type). The results obtained showed physical deflection of the three types of slab with cracks. The maximum flexural load for first slab type is 16.2 KN with 8,075 mm deflection, second slab type is 24.7 KN with 17,26 mm deflection and third slab type 3 is 32 KN with 15,29 mm deflection. The ductility of the concrete slab improved with the addition of dispersed chopped basalt fiber and basalt mesh.

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31

TAKIGUCHI, Masayuki, Tadatomo WATANABE, Tsutomu SATO e Hisashi TANAKA. "Evaluation of Ductility for Reinforced Concrete Members." Quarterly Report of RTRI 40, n. 3 (1999): 165–70. http://dx.doi.org/10.2219/rtriqr.40.165.

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32

Eswari, S., P. N. Raghunath e K. Suguna. "Ductility Performance of Hybrid Fibre Reinforced Concrete". American Journal of Applied Sciences 5, n. 9 (1 settembre 2008): 1257–62. http://dx.doi.org/10.3844/ajassp.2008.1257.1262.

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33

Kuang, J. S., e A. I. Atanda. "Enhancing ductility of reinforced concrete frame buildings". Proceedings of the Institution of Civil Engineers - Structures and Buildings 158, n. 4 (agosto 2005): 253–65. http://dx.doi.org/10.1680/stbu.2005.158.4.253.

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34

Samani, Ali Khajeh, Mario M. Attard e Stephen J. Foster. "Ductility in concentrically loaded reinforced concrete columns". Australian Journal of Structural Engineering 16, n. 3 (2 settembre 2015): 237–50. http://dx.doi.org/10.1080/13287982.2015.1092688.

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35

Wang, Qingxiang, Guofan Zhao e Liyan Lin. "Ductility of high strength reinforced concrete columns". Nuclear Engineering and Design 156, n. 1-2 (giugno 1995): 75–81. http://dx.doi.org/10.1016/0029-5493(94)00936-s.

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36

Kim, Jang Hoon. "Ductility enhancement of reinforced concrete thin walls". Computers and Concrete 2, n. 2 (25 aprile 2005): 111–23. http://dx.doi.org/10.12989/cac.2005.2.2.111.

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37

Demers, M., e K. W. Neale. "Confinement of reinforced concrete columns with fibre-reinforced composite sheets - an experimental study". Canadian Journal of Civil Engineering 26, n. 2 (1 aprile 1999): 226–41. http://dx.doi.org/10.1139/l98-067.

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Abstract (sommario):

The wrapping of fibre-reinforced composite sheets around concrete columns is a promising method for structural strengthening and repair. This rehabilitation technique is of practical interest, as the lay-up of the sheets is rather easy; it does not require specialized tools, and the epoxy resins employed cure at ambient temperatures. Here, results of an experimental investigation are reported for 16 round reinforced concrete columns 300 mm in diameter and 1200 mm high. These columns were confined by means of carbon-epoxy sheets and loaded concentrically in axial compression. The effects of various parameters on the structural behaviour of the confined concrete columns are investigated. These parameters included the concrete strength, longitudinal steel reinforcement, steel stirrups, steel corrosion, and concrete damage. The test results show that composite confinement can considerably enhance the structural performance of concrete columns, especially with regard to ductility. The potential to restore the full strength of severely damaged columns is also demonstrated, as retrofitted columns exhibit axial load carrying capacities equal or superior to those of undamaged columns, along with significant increases in ductility. The contribution of the transverse steel reinforcement is seen to be minimal, as long as the stirrup spacing is medium to large. For such cases tests on plain concrete cylinders are sufficient for further investigations of this retrofit method, as the key parameters which really affect strength and ductility are the concrete strength, composite fibre type, and sheet thickness.Key words: fibre composite sheets, confinement, concrete, column repair, rehabilitation, strengthening.

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38

Du, Chuang, Xiao Ming Yang e Ning Li Li. "Performance Analysis of Concrete-Filled Steel Tube Column and Reinforced Concrete Column under Axial Compression". Advanced Materials Research 446-449 (gennaio 2012): 82–85. http://dx.doi.org/10.4028/www.scientific.net/amr.446-449.82.

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In this paper, a comparative investigation into the behavior of concrete-filled steel tube column and reinforced concrete column with the same quantity of material and cross-section sizes under axial load have been undertaken using the finite element method. Both is analyzed to compare the axial compression performance,including bearing capacity, ductility and their mechanism. The results of the analyses clearly exhibit that bearing capacity of concrete-filled steel tube column is higher about 25% than that of reinforced concrete column. Under the same conditions, ductility of concrete-filled steel tube column is better than reinforced concrete column, its application is recommended in construction practice.

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39

Wu, Qin, Huagang Zhang, Hongniao Chen, Xin Zhang, YanHui Wei, Li Li e Kejian Ma. "Seismic Behaviour of Cast-In-Situ Phosphogypsum-Reinforced Concrete Grid Frame Composite Walls". Advances in Civil Engineering 2019 (4 novembre 2019): 1–17. http://dx.doi.org/10.1155/2019/1529137.

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This paper mainly studies the effect of cast-in-situ phosphogypsum on seismic behaviour of reinforced concrete grid frame. The mechanical behaviour of three reinforced concrete grid frames and four cast-in-situ phosphogypsum-reinforced concrete grid frame composite walls under low cycle alternating load was designed and tested. The test results show that the reinforced concrete grid frame has less bearing capacity and poor energy consumption. The addition of cast-in-situ phosphogypsum can effectively improve the seismic behaviour of the reinforced concrete grid frame. Compared with the reinforced concrete grid frame, the bearing capacity of the cast-in-situ phosphogypsum-reinforced concrete grid frame composite wall is increased by 2-3 times, the displacement ductility coefficient is increased by 0.95∼1.2 times, and the relative accumulative energy consumption is increased by 86%∼216%. This shows that the composite wall has better bearing capacity, ductility, and energy dissipation capacity.

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40

Alzeebaree, Radhwan, Abdulkadir Çevik, Alaa Mohammedameen, Anıl Niş e Mehmet Eren Gülşan. "Mechanical performance of FRP-confined geopolymer concrete under seawater attack". Advances in Structural Engineering 23, n. 6 (14 novembre 2019): 1055–73. http://dx.doi.org/10.1177/1369433219886964.

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In the study, mechanical properties and durability performance of confined/unconfined geopolymer concrete and ordinary concrete specimens were investigated under ambient and seawater environments. Some of the specimens were confined by carbon fiber and basalt fiber–reinforced polymer fabric materials with one layer and three layers under chloride and ambient environments to observe mechanical strength contribution and durability performances of these hybrid types of materials. These fiber-reinforced polymer fabric materials were also evaluated in terms of retrofit purposes especially in the marine structures. In addition, microstructural evaluation is also conducted using scanning electron microscope on geopolymer concrete and ordinary concrete specimens to observe the amount of deterioration in microscale due to the chloride attacks. Results indicated that confined specimens exhibited enhanced strength, ductility, and durability properties than unconfined specimens, and the degree of the enhancement depended on the fiber-reinforced polymer confinement type and the number of fiber-reinforced polymer layer. Specimens confined by carbon fabrics with three layers showed superior mechanical properties and durability performance against chloride attack, while specimens confined by basalt fabrics with one layer exhibited low performance, and unconfined specimens showed the worst performance. Both fiber-reinforced polymer fabric materials can be utilized as retrofit materials in structural elements against chloride attacks. The results also pointed out that seawater attack reduced the ductility performance of the geopolymer concrete and ordinary concrete specimens. Furthermore, geopolymer concrete specimens were found more durable than the ordinary concrete specimens, and both types of concretes exhibited similar fracture properties, indicating that geopolymer concrete can be utilized for structural elements instead of ordinary concretes.

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41

Wang, Kai Bin, Chun An You e Li Min Xin. "Application of ANSYS Program in Ductility Analysis of Reinforced Concrete Frame Structure with Specially-Shaped Columns". Applied Mechanics and Materials 215-216 (novembre 2012): 1118–21. http://dx.doi.org/10.4028/www.scientific.net/amm.215-216.1118.

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In this paper, the writer analyzed a three-ply reinforced concrete frame structure with specially shaped columns through compiling a program by finite elements program of ANSYS. The results of simulated approached to experimental dates by comparison them. Which mean that use ANSYS program simulated ductility performance of reinforced concrete frame structure with specially shaped columns under reversed cyclic load is feasible. The simulation reflected the ductility of reinforced concrete frame structure, in which from load-on till destruction is perfectly.

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42

Xue, Wei Chen, Bin Zhang e Yi Wang. "Static Performance of Reinforced Concrete U-Shaped Composite Beams Subjected to Positive Moment". Advanced Materials Research 368-373 (ottobre 2011): 365–68. http://dx.doi.org/10.4028/www.scientific.net/amr.368-373.365.

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The reinforced concrete U-shaped composite beam which is composed of precast U-shaped beam, precast slabs and cast-in-place (CIP) concrete, is investigated in this paper. The performance of the reinforced concrete U-shaped composite beam and the cast-in-place concrete control specimen subjected to positive moment was evaluated in terms of failure pattern, flexural strength of normal section, ductility and slips based on the monotonic static loading tests. The results showed that both specimens behaved in ductile manner. The flexural strength of reinforced concrete U-shaped composite beam was about 11% lower than that of the control specimen. The displacement ductility and curvature ductility of the precast specimen were about 33% and 18% lower than those of corresponding control specimen, respectively. The slip between precast beam and precast slab and the slip between precast slab and CIP concrete were less than 0.16mm and 0.17mm, respectively. The results in this paper are useful to expand the application of reinforced concrete U-shaped composite beam in the field of civil engineering.

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43

Chen, Xiao Qiang, Bin Jia, Hua Chuan Yao e Yu Zhang. "A Study on Flexural Bearing Capacity of RC Beams Combination Strengthened with CFRP by Comparative Experiments". Applied Mechanics and Materials 94-96 (settembre 2011): 1624–27. http://dx.doi.org/10.4028/www.scientific.net/amm.94-96.1624.

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This paper compares the flexural bearing capacity, rigidity, and ductility of the reinforced RC beams after comparative tests of reinforcing RC beams by three different ways: directly bonding CFRP, bonding CFRP after replacing concrete and bonding CFRP after replacing concrete and planting bar. The results show that the method of replacing concrete can sufficiently avoid the debonding between CFRP and concrete, improve the flexural bearing capacity, and further strengthen the rigidity and ductility; whereas the method of planting bar can well guarantee the bond of Young and old concretes, let the replacing concrete together with CFRP work better, and carry capacity increase in reinforcement.

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44

Bei, Cheng, Shi Wei Li e Ray K. L. Su. "Application of Steel Plates on the Retrofitting of Current Reinforced Concrete Coupling Beams". Advanced Materials Research 721 (luglio 2013): 714–19. http://dx.doi.org/10.4028/www.scientific.net/amr.721.714.

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Coupling beams are essential structural elements of reinforced concrete coupled shear wall to resist earthquakes and other lateral loads. But many current reinforced concrete coupling beams are insufficient in resisting lateral loads due to their bad ductility. So a test of retrofitting methods of deep coupling beams with steel plates since their good performance in the ductility and deformation was made to find ways of improving the ductility of the beams, and the results of this retrofitting method prove good because of the incensement of the ductility, deformation and strength of the beams.

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45

Rong, Xian, Jian Xin Zhang, Yan Yan Li e Yan Feng Chen. "Experimental Research on Ductility and Bearing Capacity of Prestressed High Strength Concrete Pipe Piles". Applied Mechanics and Materials 405-408 (settembre 2013): 2511–14. http://dx.doi.org/10.4028/www.scientific.net/amm.405-408.2511.

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Based on the low cyclic loading experiments on prestressed high strength concrete pipe piles, in which one of them was reinforced by steel fiber, another stirrup ratio, the other was not reinforced, the authors compare the results in terms of damage characteristic, hysteretic curve, bearing capacity, displacement and ductility. It is shown that the bearing capacity and ductility of prestressed high strength concrete pipe piles reinforced by steel fiber increases. With the increase of stirrup ratio, the hysteretic behavior and the deformation behavior of prestressed high strength concrete pipe piles improves.

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46

Xue, Jian Yang, Jian Peng Lin e Hui Ma. "Experimental Study on Seismic Performance of Steel Reinforced Recycled Concrete Column". Applied Mechanics and Materials 501-504 (gennaio 2014): 1580–86. http://dx.doi.org/10.4028/www.scientific.net/amm.501-504.1580.

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The pseudo-static tests were carried out on seven steel reinforced recycled concrete columns. The main parameters of specimens were recycled aggregate replacement ratio, axial compression ratio and volumetric stirrup ratio. The results indicate that the incorporation of recycled aggregate doesnt reduce the horizontal bearing capacity, ductility and the energy dissipation capacity of specimens and has little effect on seismic performance. The seismic performance of steel reinforced recycled concrete column decreases significantly in the high axial compression ratio. The ductility, horizontal bearing capacity and the energy dissipation capacity of the steel reinforced recycled concrete column increase with a rise in the volumetric stirrup ratio. This study provides a reference on the application of the steel reinforced recycled concrete column.

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47

M., Ahmed Heidayet, e Omer Qarani. "Ductility Ratio and Toughness Index of Reinforced Concrete Slabs Subjected to High Temperature". Journal of Zankoy Sulaimani - Part A 5, n. 2 (17 maggio 2001): 1–8. http://dx.doi.org/10.17656/jzs.10095.

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48

Arslan, Guray, e Ercan Cihanli. "CURVATURE DUCTILITY PREDICTION OF REINFORCED HIGH‐STRENGTH CONCRETE BEAM SECTIONS". JOURNAL OF CIVIL ENGINEERING AND MANAGEMENT 16, n. 4 (31 dicembre 2010): 462–70. http://dx.doi.org/10.3846/jcem.2010.52.

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Abstract (sommario):

The ductility of reinforced concrete beams is very important, since it is essential to avoid a brittle failure of the structure by ensuring adequate curvature at the ultimate limit state. One of the procedures used to quantify ductility is based on curvatures, namely, curvature ductility. It is necessary to know the curvature ductility of singly reinforced high‐strength concrete (HSC) sections for determining a maximum permissible tensile reinforcement ratio or a maximum depth of the concrete compression area in design codes. The requirements of several codes and methods of prediction of the curvature ductility are based on the experimental results of normal strength concrete (NSC). The rules derived for NSC sections may not be appropriate for HSC sections, and verifications and modifications may be required for the evaluation of curvature ductility of HSC sections. In this study, the major factors affecting the curvature ductility of a singly reinforced HSC beam section are investigated. Based on numerical analyses, a parametric study has been carried out to evaluate the effects of various structural parameters on the curvature ductility of reinforced HSC beam sections. Santrauka Gelžbetoniniu siju plastiškumas yra labai svarbi savybe, apsauganti konstrukcija nuo staigios irties. Tam užtikrinti reikalinga atitinkama kreive, esant tinkamumo ribiniam būviui. Plastiškumas ivertinamas naudojant kreivines diagramas – plastiškumo kreives. Norint nustatyti didžiausia tempiamos armatūros kieki arba didžiausia gniuždomosios zonos aukšti, remiantis normomis reikia žinoti armuoto stipriojo betono (HSC) plastiškumo kreive. Kai kurios normos ir metodai plas‐tiškumo kreive nustato pagal paprastojo betono (NSC) eksperimentinius duomenis. Taisykles, skirtos paprastojo betono skerspjūvio plastiškumo kreivei nustatyti, gali netikti stipriajam betonui, todel reikia atlikti papildomus tyrimus ir metodu pakeitimus. Šiame darbe tiriami pagrindiniai veiksniai, darantys itaka stipriojo betono plastiškumo kreivei. Atliekant skai‐tini modeliavima, buvo ivertinti ivairūs skerspjūvio konstrukciniai parametrai, darantys poveiki stipriojo betono plas‐tiškumo kreivei.

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49

Chen, C. C., e S. M. Hsu. "Formulas for Curvature Ductility Design of Doubly Reinforced Concrete Beams". Journal of Mechanics 20, n. 4 (dicembre 2004): 257–65. http://dx.doi.org/10.1017/s1727719100003476.

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Abstract (sommario):

AbstractWith the concrete treated as unconfined, semi-empirical equations for curvature ductility ratios of doubly reinforced beam sections were derived. Based on the resulted semi-empirical equations, design formulas for curvature ductility ratios, which take into account the effect of tension and compression reinforcement ratios and strengths of reinforcement and concrete, are established and calibrated. The proposed design formulas are fairly simple with reasonable accuracy. The proposed design formulas enable the designer to design beam sections for selected ductility ratios, and, consequently, to acquire better control of concrete spalling during major earthquakes. From the aspect of performance based design, the proposed formulas can facilitate beam design for concrete spalling limit state.

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50

Kamal, Ahmed Youssef. "Ductility of simply supported rubberized concrete beams". Challenge Journal of Concrete Research Letters 12, n. 2 (23 giugno 2021): 49. http://dx.doi.org/10.20528/cjcrl.2021.02.002.

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Dispose of waste rubberized tires become a dangerous problem around the world, represented a big serious risk to the sur-rounded environment. Many studies show that over 1000 million tires reach their expired date yearly and this figure is anticipated to be 5000 million tires by reaching 2030. A minor part of them is employed as recycled materials and the residual amount is stockpiled or buried. This paper aimed to successfully utilize the vast amounts of tire rubber waste existing currently in landfills. This paper represents a practical investigation of the ductility performance of the reinforced rubberized concrete beams. Thirteen reinforced concrete beams simply supported, with waste rubber tires mixtures vary from 0 to 8 percentage as aggregates replacements, were tested by mid-span load. Therefore, to examine the ductility performance of reinforced rubberized concrete beams, three sets of samples were made. In the first group, coarse aggregates in the concrete mix were replaced by different percentages of the waste rubber partials, while for the second group, crumb rubber was replaced for the fine aggregates, and for the third one, a mix of waste and crumbed rubber were replaced for both types of aggregates. Experimental results of rubberized specimens were also compared with that of the reference beam (without rubber replacement), the comparison results declare that concrete contains rubber particles is less ductile than conventional concrete.

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