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Letteratura scientifica selezionata sul tema "Concrete beams Testing"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 31 gennaio 2023

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Articoli di riviste sul tema "Concrete beams Testing"

1

Zainurrahman, Eko Darma e Sri Nuryati. "Carbon Fiber Reinforced Polymer Sebagai Perkuatan Lentur pada Balok Beton". BENTANG : Jurnal Teoritis dan Terapan Bidang Rekayasa Sipil 8, n. 1 (15 gennaio 2020): 20–28. http://dx.doi.org/10.33558/bentang.v8i1.1947.

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Concrete Beams can experience a sudden collapse when overload because of its brittle characteristic. The use of Carbon Fiber Reinforced Polymer (CFRP) on concrete beams externally as external confinement is predicted to improve concrete mechanics properties, increase the ductility and capacity of concrete, and the flexural strength of concrete beams. An experimental study on the reinforcement of concrete beams with Carbon Fiber Reinforced Polymer (CFRP) was carried out to estimate the effectiveness of CFRP on concrete structures as a concrete beam flexural reinforcement material. Two types of concrete beams are provided in this study to test the flexural strengthening effect of the externally bound CFRP composite. First type of concrete beam used for testing is a normal concrete beams, whereas the second tested beam, the CFRP was laminated by coating the beams with Fiber. The dimensions of both types are 15cm x15cm with a length of 55cm footing range. Testing result obtained the compressive strength was 23,29 MPa, flexural strength of normal and CRFP concretes were 33,41 Kg/cm2 and 48,07 Kg/cm2 respectively. It was concluded that the use of CRFP at the concrete beam increases flexural strength up to 44% with the ratio of 143 %.

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2

Muhtar, Amri Gunasti, Suhardi, Nursaid, Irawati, Ilanka Cahya Dewi, Moh Dasuki et al. "The Prediction of Stiffness of Bamboo-Reinforced Concrete Beams Using Experiment Data and Artificial Neural Networks (ANNs)". Crystals 10, n. 9 (27 agosto 2020): 757. http://dx.doi.org/10.3390/cryst10090757.

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Stiffness is the main parameter of the beam’s resistance to deformation. Based on advanced research, the stiffness of bamboo-reinforced concrete beams (BRC) tends to be lower than the stiffness of steel-reinforced concrete beams (SRC). However, the advantage of bamboo-reinforced concrete beams has enough good ductility according to the fundamental properties of bamboo, which have high tensile strength and high elastic properties. This study aims to predict and validate the stiffness of bamboo-reinforced concrete beams from the experimental results data using artificial neural networks (ANNs). The number of beam test specimens were 25 pieces with a size of 75 mm × 150 mm × 1100 mm. The testing method uses the four-point method with simple support. The results of the analysis showed the similarity between the stiffness of the beam’s experimental results with the artificial neural network (ANN) analysis results. The similarity rate of the two analyses is around 99% and the percentage of errors is not more than 1%, both for bamboo-reinforced concrete beams (BRC) and steel-reinforced concrete beams (SRC).

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3

Michalek, Peter, Jakub Kralovanec e Jan Bujnak. "Composite Steel and RPC Testing". Pollack Periodica 15, n. 3 (7 novembre 2020): 144–49. http://dx.doi.org/10.1556/606.2020.15.3.14.

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Reactive powder concretes are a set of ultrahigh-strength concrete reinforced with fibers. Their compressive strength is greater than 100 MPa. For assuring connection of steel beams and a concrete slab, steel stud connectors are used. The investigation of that kind of shear connection efficiency, in the case of this higher strength concrete deck using standard push-out test specimens has been executed. The experimental results are presented in the paper.

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4

Aparicio, Angel C., Gonzalo Ramos e Juan R. Casas. "Testing of externally prestressed concrete beams". Engineering Structures 24, n. 1 (gennaio 2002): 73–84. http://dx.doi.org/10.1016/s0141-0296(01)00062-1.

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5

Sunar Bükülmez, Pınar, e Oguz C. Celik. "Pre and post-fire mechanical properties of structural steel and concrete in steel-concrete composite cellular beams". MATEC Web of Conferences 282 (2019): 02054. http://dx.doi.org/10.1051/matecconf/201928202054.

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This paper presents an experimental investigation into possible variations of mechanical properties of structural steel and concrete in composite cellular beams exposed to ISO 834 fire and cooled down phases. Four full-scale fire tests were performed on protected and unprotected beams under assumed service loads. Tensile stress-strain behavior of steel coupons taken from the beams and compressive strengths of concrete cores taken from the reinforced concrete slabs are studied. Material coupon tests for steel are carried out as per TS EN ISO 6892-1. As for the concrete, compression tests were conducted. Coupon test results reveal that, after fire testing, a maximum reduction ratio of 65% in ultimate strain is obtained for the unprotected beam samples. This indicates that the reductions in the mechanical properties of steel in the protected beams are much less when compared to those of the unprotected beams. It is also found that the maximum increase in post-fire strength/pre-fire strength ratios for concrete is 11% for the unprotected beam, while a 20 % decrease is recorded for water based protected cellular beam. For the protected specimens, the RC slabs were exposed to higher temperatures, and the compressive strength of concrete after testing was lower than that of the unprotected beam slabs.

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6

Jiang, De Bao, e Xiao Jing Gu. "Test Research of Prestressed Concrete Beams with CFRP under Low Cyclic Loading". Advanced Materials Research 163-167 (dicembre 2010): 3848–52. http://dx.doi.org/10.4028/www.scientific.net/amr.163-167.3848.

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Through testing it is obtained that force and the damage that 1 root structure of prestressed concrete beams strengthened and 3 different layers CFRP reinforced stickup prestressed concrete beams under cyclic loading. This test results show that CFRP reinforcement effect of prestressed concrete beams is obvious, and at the same time the cracking of prestressed concrete beam has also has certain reinforcement effect; But the CFRP reinforcement effect is proportional to the number of layers.

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7

Newtson, Craig M., Gaur P. Johnson e Brian T. Enomoto. "Fundamental Frequency Testing of Reinforced Concrete Beams". Journal of Performance of Constructed Facilities 20, n. 2 (maggio 2006): 196–200. http://dx.doi.org/10.1061/(asce)0887-3828(2006)20:2(196).

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8

Motter, Christopher J., David C. Fields, John D. Hooper, Ron Klemencic e John W. Wallace. "Steel-Reinforced Concrete Coupling Beams. I: Testing". Journal of Structural Engineering 143, n. 3 (marzo 2017): 04016191. http://dx.doi.org/10.1061/(asce)st.1943-541x.0001670.

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9

Jesse, S. Margaret, e V. M. Shanthi. "Investigating the Load–Deflection of FRP Material in Concrete Beams Wrapped with CFRP in Universal Testing Machine (UTM)". Journal of Computational and Theoretical Nanoscience 15, n. 2 (1 febbraio 2018): 744–51. http://dx.doi.org/10.1166/jctn.2018.7155.

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Strengthening Reinforced Concrete (RC) beams using FRP laminate becomes one of the main strengthening techniques. Failure of these beams is usually controlled by the bond strength between the laminate and the concrete. This paper presents the results of experimental investigation on six reinforced concrete beams, with various types, which were tested under two-point loading. The aim of the work was to study the efficacy of Carbon Fiber Reinforced Polymer (CFRP) sheets in enhancing the beam strength and stiffness from shear failure or flexural failure. The strengthening and deflection of the beams were carried out with cyclic loading. Experimental data on ultimate load, deflection and failure modes of each of the beams were obtained. For the comparison of CFRP sheet with cement concrete and the retrofitted specimens absorbs more energy, the CFRP beams yield a good result.

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Buller, A. H., M. Oad e B. A. Memon. "Flexural Behavior of Reinforced RAC Beams Exposed to 1000°C Fire for 18 Hours". Engineering, Technology & Applied Science Research 9, n. 3 (8 giugno 2019): 4225–29. http://dx.doi.org/10.48084/etasr.2733.

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In order to meet the socio-economic demands around the globe, construction industry not only consumes concrete at a very fast pace but also yields huge amounts of construction and demolishing waste. The phenomenon gives rise to environmental issues due to production of concrete ingredients and due to dumping of the waste. Therefore, one of the solutions is the production of green concrete utilizing demolished waste. This research work studies the effect of prolonged fire (18 hours) on the flexural behavior of reinforced concrete–recycled aggregate beams. The beams were using 50% replacement of natural coarse aggregates with demolished concrete. The beam samples were cast as both normal and rich mix concrete and were cured for 28 days. After curing, the beams were exposed to fire at 1000°C in a purpose made oven, followed by testing in a universal load testing machine under central point load. The test results show that the proposed beams (cast with rich mix) exhibited about 22% reduction in flexural strength. The failure mode of the beams was observed as shear failure.

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Tesi sul tema "Concrete beams Testing"

1

Mitchell, Andrew Douglass. "Shear friction behavior of high-strength concrete". Thesis, Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/19274.

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Saeed, Yasir Matloob. "Behavior of Prestressed Concrete Beams with CFRP Strands". PDXScholar, 2016. http://pdxscholar.library.pdx.edu/open_access_etds/2726.

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Abstract (sommario):

The high cost of repairing reinforced or prestressed concrete structures due to steel corrosion has driven engineers to look for solutions. Much research has been conducted over the last two decades to evaluate the use of Fiber Reinforced Polymers (FRPs) in concrete structures. Structural engineering researchers have been testing FRP to determine their usability instead of steel for strengthening existing reinforced concrete structures, reinforcing new concrete members, and for prestressed concrete applications. The high strength-to-weight ratio of FRP materials, especially Carbon FRP (CFRP), and their non-corrosive nature are probably the most attractive features of FRPs. In this study, an experimental program was conducted to investigate the flexural behavior of prestressed concrete beams pre-tensioned with CFRP strands. The bond characteristics were examined by means of experimentally measuring transfer length, flexural bond length, and bond stress profiles. A total of four rectangular beams pre-tensioned with one 0.5-in. diameter CFRP strand were fabricated and tested under cyclic loading for five cycles, followed by a monotonically increasing load until failure. In investigating bond properties, the experimental results were compared to the equations available in the literature. The results from the four flexural tests showed that the main problem of CFRP strands, in addition to their liner-elastic tensile behavior, was lack of adequate bonding between FRP and concrete. Poor bonding resulted in early failure due to slippage between FRPs and concrete. As a result, a new technique was developed in order to solve the bonding issues and improve the flexural response of CFRP prestressed concrete beams. The new technique involved anchoring the CFRP strands at the ends of the concrete beams using a new "steel tube" anchorage system. It was concluded that the new technique solved the bond problem and improved the flexural capacity by about 46%. A computer model was created to predict the behavior of prestressed beams pre-tensioned with CFRP. The predicted behavior was compared to the experimental results. Finally, the experimental results were compared to the behavior of prestressed concrete beams pre-tensioned with steel strands as generated by the computer model. The CFRP beams showed higher strength but lower ductility.

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Al-lami, Karrar Ali. "Experimental Investigation of Fiber Reinforced Concrete Beams". PDXScholar, 2015. https://pdxscholar.library.pdx.edu/open_access_etds/2296.

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Abstract (sommario):

Shear strength of fiber reinforced concrete beams was studied in this research project. Three types of fibers were examined: hooked-end steel fiber, crimped-steel fiber, and crimped-monofilament polypropylene fibers. The experimental program included five beam specimens. Two of the beams were control specimens in which one was reinforced with minimum shear reinforcement according to ACI 318, while the other one did not have any shear reinforcement. Each one of the other three specimens was reinforced with one of the above mentioned fibers by 1% volumetric ratio. In addition to the beam specimens, three prisms were also made for each type fiber to determine their toughness. The aim of this research was to investigate the following questions for medium-high concrete strength 1) to evaluate the effectiveness of each type of fibers on the shear strength, 2) to investigate the shear strength, toughness, crack patterns and near ultimate load crack width of each beam, and 3) to determine if using 1% volumetric ratio of fibers as shear reinforcement in beams would provide adequate strength and stiffness properties comparable to reinforcing steel used as minimum shear reinforcement. The results showed that all three types of fibers increased the shear capacity of the beam specimens more than the beam reinforced with minimum shear reinforcement. Moreover, some of the fibers used could shift the type of failure from a pure shear failure to a combined flexural-shear or pure flexural failure.

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4

Tso, Karmen, e 曹嘉雯. "Full-range behaviour of concrete beams partially prestressed with unbonded tendons". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2007. http://hub.hku.hk/bib/B38225578.

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Belghiti, Moulay El Mehdi. "Influence of steel fibres on response of beams". Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=100222.

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The following thesis presents the results of six full scale beams tests as part of a research program conducted at McGill University on the effect of steel fibres on the shear capacity of a beam with an aid ratio greater than 2.5. The test specimens had the following dimensions: 4400 mm long, 300 mm wide and 500 mm long. The beams had 4-25M bottom reinforcing bars and 2-20M top reinforcing bars. Two series were designed with different reinforcing details: the "BA" series contained transverse reinforcement spaced at 275 mm center to center while the "BB" series had no transverse reinforcement. The specimens were cast in three batches of two specimens from each series, with each batch containing concrete with respectively 0%, 0.5% and 1% fibres content by volume. The beams were simply supported and were tested with two equal point loads located at 500 mm from the centre of the beam.
This research project demonstrated a clear improvement of the shear capacity resulting from the use of steel fibres for the beams without transverse reinforcement. For the beams with transverse reinforcement, displacement ductility was highly increased. This suggests that fibres have the potential to reduce the congestion of the reinforcement if fibres are designed to replace partially closely spaced transverse reinforcement. Also, it was noted that a redistribution of stresses occurred resulting in the formation of more well-controlled cracks. Finally, the strength predictions using the method developed by Aoude (Aoude, 2007) agree very well with the experimental results.

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Peters, Timothy M. "Ultimate failure criteria for prestressed concrete T-beams". Thesis, Queensland University of Technology, 1989. https://eprints.qut.edu.au/36455/1/36455_Peters_1989.pdf.

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The adoption of a limit states design approach for concrete design requires a realistic assessment of the flexural capacity of reinforced, prestressed, and partially prestressed concrete structures at their ultimate limit state. The author has investigated experimentally the post-elastic behaviour of a series of continuous partially prestressed concrete T-beams and draws comparison to tests on similar beams of rectangular section. Use of photogrammetric measuring techniques to produce moment curvature relationships was made during the testing process. Results have shown that partially prestressed concrete beams of Tee section can possess sufficient rotation capacity to allow full redistribution of bending moments. The rotation capacity was shown to increase as the reinforcing index of a section decreased. A similar relationship was found with the prestress ratio. Softening of the section prior to failure was also observed at the initial plastic hinge. It was also found that torsional moments can have a significant effect on the in plane moment-curvature relationship of a section.

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7

Lam, Wai-yin, e 林慧賢. "Experimental study on embedded steel plate composite coupling beams". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2003. http://hub.hku.hk/bib/B26643352.

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Seljen, Andreas. "Testing of Fibre Reinforced Concrete : Shear Capacity of I-Beams". Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for konstruksjonsteknikk, 2013. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-22389.

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A series of full-scale steel fibre reinforced I-beams with varying web width has been tested in shear failure. A rectangular steel fibre reinforced beam and a conventionally reinforced I-beam have also been tested for comparison. The concrete used is a self-compacting concrete with a B45 classification. The concrete contains 1%vol (78,5kg/m3) steel fibres with end-hooks of type Dramix 3D 65/60.The load-deflection and load-shear crack opening response has been analysed for all beams and been compared with each other. A fibre count has also been conducted to investigate the influence the element size has on the fibre orientation. The results have been compared with guidelines from COIN and Model Code based on residual flexural tensile strengths from small beam tests according to NS-EN 14651. The report also gives an introduction of steel fibre reinforced concrete and design guidelines used to estimate the shear capacity.The results show that steel fibres have a significant effect on the shear capacity. All beams had more capacity than expected based on calculations made prior to testing. The ultimate shear capacity seems to be higher for I-beams than rectangular beams. A high fibre orientation factor in the longitudinal direction is found in the web in all beams, though a low representation of fibres around the tensile reinforcement. The orientation factor seems to increase with more slender elements. A good correlation between ultimate shear capacity and fibre orientation factor is not found within the range studied. However, the load at first crack seems to increase with higher longitudinal fibre orientation factor. An increase in the first crack load is also found for the SFRC beam compared to the beam with stirrups.

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Rafeeq, Ranj. "Torsional Strengthening of Reinforced Concrete Beams Using CFRP Composites". PDXScholar, 2016. http://pdxscholar.library.pdx.edu/open_access_etds/3125.

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Few decades ago, there were no guidelines for torsion design of reinforced concrete (RC) beams. Hence, many existing beams in older buildings have a lack of adequate torsional strength since they were not properly designed for torsion. One way to regain/rehabilitate adequate torsional strength is through application of externally bonded carbon fiber reinforced polymers (CFRP). To date, American Concrete Institute (ACI) code, as well as other building codes, do not have recommendations or provisions for strengthening RC beams for torsion using fiber-reinforced polymer (FRP) composites due to the inexistence of conclusive experimental and analytical data. Of the very limited works on this behavior, the majority of the focus has been devoted to experimental works. Realistic spandrel beams in a building that lack torsional strength were modelled in this research, and strengthened to examine various behaviors such as load capacity, deflection, torque, twist, crack propagation, ductility, and failure modes. For this purpose, six RC beams were tested: four reference beams and two strengthened beams were used to observe additional capacity through the use of carbon fiber-reinforced polymer (CFRP) sheets. To strengthen the beams, one layer of sheets was completely wrapped around them. Results show an additional torsional capacity of 63% and 178% relative to their respective reference beams. Through strengthening, modes of failure of the beams changed from brittle torsion-dominated failure to shear-flexure failure in both beams. The study also included crack pattern and ductility of test beams. Cracks became smaller in width and more evenly distributed across the torsion-loaded area, and torsional ductility was enhanced by 266% and 165% respectively. Flexural ductility was also greatly enhanced by more than five folds. Finally, using ACI 318-14, ACI 440.2R-02, and available formulae in the literature, the beams were analyzed and the respective values were compared.

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Lam, Yuet-kee Jeffery, e 林悦基. "Full-range analysis of reinforced concrete members and frames". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2009. http://hub.hku.hk/bib/B42182268.

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Libri sul tema "Concrete beams Testing"

1

1935-, Kong F. K., a cura di. Reinforced concrete deep beams. Glasgow: Blackie, 1990.

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2

Kalleja, Hartmut. Übertragungsgesetze und Querkrafttragverhalten von Mikrobetonbalken unter Einschluss einer Vorspannung ohne Verbund. Düsseldorf: Werner-Verlag, 1988.

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3

Alca, Nedim. Effect of size on flexural behaviour of high-strength concrete beams. Edmonton, Alta: Dept. of Civil Engineering, University of Alberta, 1993.

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4

Koch, Rainer. Dauerschwingversuch an einem teilweise vorgespannten Spannbetonträger. Stuttgart: Otto-Graf-Institut, 1988.

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5

Singh, Tarvinder. Axisymmetric global structural analysis of BARC prestressed concrete containment model for beyond design pressure. Mumbai: Bhabha Atomic Research Centre, 2008.

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6

Will, Norbert. Zum Verbundverhalten von Spanngliedern mit nachträglichem Verbund unter statischer und dynamischer Dauerbeanspruchung. Aachen: Lehrstuhl und Institut für Massivbau der RWTH Aachen, 1997.

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Ehret, Karl-Heinz. Ein Beitrag zur Theorie II. Ordnung bei kippgefährdeten Stahlbeton- und Spannbetonträgern. München/Neubiberg: Universität der Bundeswehr München, 1989.

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8

Rosa, Michael A. Improving predictions for camber in precast, prestressed concrete bridge girders. [Olympia, Wash.]: Washington State Dept. of Transportation, 2007.

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9

Byle, Kenneth Arlan. Time-dependent deformation behavior of prestressed high performance concrete bridge beams. [Austin, Tex.]: Center for Transportation Research, Bureau of Engineering Research, University of Texas at Austin, 1998.

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USA-Australia Workshop on High Performance Concrete (1997 Sydney, N.S.W.). Proceedings of the USA-Australia Workshop on High Performance Concrete (HPC), Sydney, Australia, August 20-23, 1997. Perth, W.A: Curtin University of Technology, School of Civil Engineering, 1997.

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Capitoli di libri sul tema "Concrete beams Testing"

1

Tigeli, M., P. Moyo e H. Beushausen. "Behaviour of Corrosion Damaged Reinforced Concrete Beams Strengthened Using CFRP Laminates". In Nondestructive Testing of Materials and Structures, 1079–85. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-0723-8_151.

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Gudmarsson, A., N. Ryden e B. Birgisson. "Determination of the Frequency Dependent Dynamic Modulus for Asphalt Concrete Beams Using Resonant Acoustic Spectroscopy". In Nondestructive Testing of Materials and Structures, 199–204. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-0723-8_29.

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3

Fujisaku, Yusuke, Hideki Naito e Kohko Inaba. "Damage evaluation of concrete beams using forced vibration testing and machine learning". In Bridge Safety, Maintenance, Management, Life-Cycle, Resilience and Sustainability, 1213–19. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003322641-146.

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Clendennen, Crystal Rae, e Pedro Romero. "Evaluating the Representative Volume Element of Asphalt Concrete Mixture Beams for Testing in the Bending Beam Rheometer". In Multi-Scale Modeling and Characterization of Infrastructure Materials, 13–30. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-6878-9_2.

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Ghosh, Swarnangshu, Rithik Agrawal e R. Vidya Sagar. "Implementation of Acoustic Emission Testing to Study the Type of Cracking in Reinforced Concrete Beams". In Lecture Notes in Mechanical Engineering, 283–96. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-0186-6_28.

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6

Nour, Omar, Osama Salem e Ahmed Mostafa. "Experimental Testing of GFRP-Reinforced Concrete Beams with Mid-Span Lap Splices Utilizing Straight- and Hooked-End Bars". In 8th International Conference on Advanced Composite Materials in Bridges and Structures, 103–10. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-09409-5_12.

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Takács, P. F., K. V. Høiseth, S. I. Sørensen, T. Kanstad, J. A. Øverli e E. Thorenfeldt. "Non-linear analysis of prestressed concrete beams with a total strain based model: FEM model and full-scale testing". In Finite Elements in Civil Engineering Applications, 201–8. London: CRC Press, 2021. http://dx.doi.org/10.1201/9781003211365-28.

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Yamada, M., K. Tagomori e M. Ohtsu. "Identification of Tendon Ducts in Prestressed Concrete Beam by SIBIE". In Nondestructive Testing of Materials and Structures, 59–65. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-0723-8_8.

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Ndong, Abdou K., Mehrdad S. Dizaji, Mohamad Alipour, Osman E. Ozbulut e Devin K. Harris. "Load Rating of a Reinforced Concrete T-Beam Bridge Through Ambient Vibration Testing and Finite Element Model Updating". In Conference Proceedings of the Society for Experimental Mechanics Series, 337–43. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-74421-6_45.

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Beben, D., W. Anigacz e A. Mordak. "GPR testing of reinforced concrete viaduct beams". In Durability of Bridge Structures, 245–52. CRC Press, 2013. http://dx.doi.org/10.1201/b15790-28.

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Atti di convegni sul tema "Concrete beams Testing"

1

Crisinel, Michel, e Gabriele Guscetti. "Design and Testing of Two Composite Underspanned Beams". In International Conference on Composite Construction in Steel and Concrete 2008. Reston, VA: American Society of Civil Engineers, 2011. http://dx.doi.org/10.1061/41142(396)18.

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2

Alsharari, Fahad, Ayman El-Zohairy, Hani Salim e Mohammed Mutnbak. "Fatigue Testing of Post-Tensioned Steel-Concrete Composite Beams". In Structures Congress 2020. Reston, VA: American Society of Civil Engineers, 2020. http://dx.doi.org/10.1061/9780784482896.014.

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"Fire testing of RC beams strengthened with NSM reinforcement". In SP-275: Fiber-Reinforced Polymer Reinforcement for Concrete Structures 10th International Symposium. American Concrete Institute, 2011. http://dx.doi.org/10.14359/51682461.

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Thapa, Aashish, Mustafa Mashal e Mahesh Acharya. "Large-Scale Flexural Testing of Concrete Beams Reinforced with Conventional Steel and Titanium Alloy Bars". In IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2022. http://dx.doi.org/10.2749/prague.2022.0272.

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<p>The research focuses on the use of Titanium Alloy Bars (TiABs) in concrete cap beams. TiABs offer good ductility, high strength, lightweight, superior corrosion resistance, lower overstrength, and better fatigue performance. TiABs have recently been used in several existing bridges in Oregon and Texas in the United States to increase shear and flexural capacities of concrete beams. While TiABs have been implemented in retrofitting of existing bridges in the United States, their application in new structures have not been tested and compared against conventional steel rebars. Idaho State University (ISU) has been investigating application of TiABs in new concrete structures through large-scale testing. Past research at ISU has shown that the use of titanium alloy (Ti-6Al-4V) in new bridges can reduce rebar congestion and residual drift after an earthquake by 50% while providing adequate ductility and strength compared to cast-in-place construction. The research in this paper proposes concept for an innovative cap beam reinforced with longitudinal TiABs. The cap beam integrates both structural performance and durability. Flexural and shear design procedures for the cap beam in accordance with the AASHTO LRFD Design are discussed. To investigate structural performance, a large-scale cap beam reinforced with longitudinal grade 5 titanium alloy (Ti-6Al-4V) is tested under three-point bending test protocol. The results are compared against a benchmark cast-in-place beam with normal rebars under the same testing arrangement and loading protocol.</p>

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"Behavior of Juxtaposed Galvanic Couples in Small Repaired Beams by Using Primers to the Reinforcement". In SP-229: Quality of Concrete Structures and Recent Advances in Concrete Materials and Testing. American Concrete Institute, 2005. http://dx.doi.org/10.14359/14738.

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"Detecting Cracks in the Beams and Columns of a Post-Tensioned Parking Garage Using the Impact-Echo Method". In SP-168: Innovations In Nondestructive Testing of Concrete. American Concrete Institute, 1997. http://dx.doi.org/10.14359/5956.

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7

White, Greg, e Matthew Johnson. "Investigating Alternates to Flexural Beams for Airport Concrete Strength Compliance". In 12th International Conference on Concrete Pavements. International Society for Concrete Pavements, 2021. http://dx.doi.org/10.33593/6aa8kpnf.

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Concrete for airport rigid pavement construction is generally specified to achieve a minimum characteristic flexural strength of 4.5 MPa and acceptance testing during construction aims to verify this key design assumption. The large flexural beam specimens are cumbersome and the testing is expensive. Consequently, industry desires a more convenient test and a laboratory-based conversion to an estimated flexural strength for acceptance testing during production. This research developed and trialed a protocol for the conversion of indirect tensile strength and compressive strength to estimate the flexural strength. The laboratory correlation was encouraging. However, when trialed on a real construction project, the conversions significantly underestimated the measured flexural strength and the risk of rejecting compliant batches of concrete was significantly higher. Further research is required to understand why the reliable conversions developed in the laboratory failed in the field. This may be related to the effect of ambient temperature on 28 day flexural strength, despite the constant curing condition.

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"FE Analysis on Cohesive Debonding and Cracking Behavior for HIP-Strengthened Concrete Beams by Nonlinear Fracture Mechanics". In SP-201: Fracture Mechanics for Concrete Materials: Testing and Applications. American Concrete Institute, 2001. http://dx.doi.org/10.14359/10769.

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9

"Some Aspects of Closed-Loop Controlled Testing of Reinforced Concrete Beams at High Rates". In SP-143: New Experimental Techniques for Evaluating Concrete Material & Structural Performance. American Concrete Institute, 1994. http://dx.doi.org/10.14359/4601.

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10

Arne, Kevin, Chiwon In, Jin-Yeon Kim, Kimberly Kurtis e Laurence J. Jacobs. "Nondestructive estimation of depth of surface opening cracks in concrete beams". In 40TH ANNUAL REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION: Incorporating the 10th International Conference on Barkhausen Noise and Micromagnetic Testing. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4864902.

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Rapporti di organizzazioni sul tema "Concrete beams Testing"

1

Roesler, Jeffery, Sachindra Dahal, Dan Zollinger e W. Jason Weiss. Summary Findings of Re-engineered Continuously Reinforced Concrete Pavement: Volume 1. Illinois Center for Transportation, maggio 2021. http://dx.doi.org/10.36501/0197-9191/21-011.

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This research project conducted laboratory testing on the design and impact of internal curing on concrete paving mixtures with supplementary cementitious materials and evaluated field test sections for the performance of crack properties and CRCP structure under environmental and FWD loading. Three experimental CRCP sections on Illinois Route 390 near Itasca, IL and two continuously reinforced concrete beams at UIUC ATREL test facilities were constructed and monitored. Erodibility testing was performed on foundation materials to determine the likelihood of certain combinations of materials as suitable base/subbase layers. A new post-tensioning system for CRCP was also evaluated for increased performance and cost-effectiveness. This report volume summarizes the three year research effort evaluating design, material, and construction features that have the potential for reducing the initial cost of CRCP without compromising its long-term performance.

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Weiss, Charles, William McGinley, Bradford Songer, Madeline Kuchinski e Frank Kuchinski. Performance of active porcelain enamel coated fibers for fiber-reinforced concrete : the performance of active porcelain enamel coatings for fiber-reinforced concrete and fiber tests at the University of Louisville. Engineer Research and Development Center (U.S.), maggio 2021. http://dx.doi.org/10.21079/11681/40683.

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A patented active porcelain enamel coating improves both the bond between the concrete and steel reinforcement as well as its corrosion resistance. A Small Business Innovation Research (SBIR) program to develop a commercial method for production of porcelain-coated fibers was developed in 2015. Market potential of this technology with its steel/concrete bond improvements and corrosion protection suggests that it can compete with other fiber reinforcing systems, with improvements in performance, durability, and cost, especially as compared to smooth fibers incorporated into concrete slabs and beams. Preliminary testing in a Phase 1 SBIR investigation indicated that active ceramic coatings on small diameter wire significantly improved the bond between the wires and the concrete to the point that the wires achieved yield before pullout without affecting the strength of the wire. As part of an SBIR Phase 2 effort, the University of Louisville under contract for Ceramics, Composites and Coatings Inc., proposed an investigation to evaluate active enamel-coated steel fibers in typical concrete applications and in masonry grouts in both tension and compression. Evaluation of the effect of the incorporation of coated fibers into Ultra-High Performance Concrete (UHPC) was examined using flexural and compressive strength testing as well as through nanoindentation.

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Hawkins, David, e John Hanson. Testing and Evaluation of a Dapped-End Prestressed Concrete Pocketed Spandrel Beam. Precast/Prestressed Concrete Institute, 2000. http://dx.doi.org/10.15554/pci.rr.comp-019.

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4

Morrison, Jeffrey, e John Hanson. Testing and Evaluation of a Uniform-Depth, Prestressed Concrete Pocketed Spandrel Beam. Precast/Prestressed Concrete Institute, 1999. http://dx.doi.org/10.15554/pci.rr.comp-021.

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5

SHEAR BEHAVIOR OF NOVEL DEMOUNTABLE BOLTED SHEAR CONNECTOR FOR PREFABRICATED COMPOSITE BEAM. The Hong Kong Institute of Steel Construction, dicembre 2022. http://dx.doi.org/10.18057/ijasc.2022.18.4.2.

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Bolted shear connectors offer alternatives to achieve steel-concrete composite action instead of conventional welded headed studs especially for prefabricated constructions and demountable composite structures. This paper firstly proposed a new type of demountable steel-concrete bolted shear connectors based on the double-nut friction-grip high strength bolted connector, which modify the upper nut into conical locking nut. This paper performed ten full scale push-out tests to study shear behaviors of the developed new type of connectors. Testing parameters included bolt configuration, strength, diameter of bolts and strength of infilled grout. Test results indicate that shear behaviors and slip capacity of the conventional bolted connectors are significantly improved when the bolted connector incorporating with conical locking nut. The influences of these studied parameters on shear behaviour of novel bolted shear connectors are revealed and discussed. The developed novel demountable connector exhibits an average 25% improvement in ultimate shear resistance over conventional bolted connectors. Moreover, the shear stiffness of the developed bolted connectors is about six times of the conventional bolted connector through eliminating the clearance between steel flange hole and bolt shank.

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