Shear Behavior Of Concrete Beams Reinforced With High Performance Steel Shear Reinforcement
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Shear Behavior Of Concrete Beams Reinforced With High Performance Steel Shear Reinforcement
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Author :
language : en
Publisher:
Release Date : 2004
Shear Behavior Of Concrete Beams Reinforced With High Performance Steel Shear Reinforcement written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.
The current shear design provisions of the ACI 318 specifications limit the yield strength in transverse reinforcement to 60 ksi. Advancement in technology has led to the fabrication of High Performance steel. Use of HP steel in reinforced concrete could lead to cost savings by reducing the amount of steel required due to the inherited high strength and increase of the service life of structural members due to its enhanced corrosion resistance. This research is undertaken to examine the use of high performance steel as a feasible reinforcement material for reinforced concrete structures. Commercially available steel, Micro-Composite Multi-Structural Formable (MMFX), conforming to ASTM A 1035, was selected for this study. MMFX steel has minimum yield strength of 100 ksi. This experimental program comprised eighteen tests using nine large-scale reinforced concrete beams subjected to static loading up to failure. The key parameters considered in experimental program were the steel type and the amount of shear reinforcement. This research investigated crack width, modes of failure, deflection, stirrup strain, ultimate load carrying capacity and the behavior of the MMFX steel as transverse reinforcement for concrete beams. Results from the experimental program show that by utilizing the higher yield strength and consequently reducing the reinforcement ratio of MMFX steel, the beams can achieve almost the same load-carrying capacity as the beams reinforced with conventional Grade 60 steel. Also, beams reinforced with MMFX showed similar deflections at service load as the beams reinforced with Grade 60 steel. Therefore, reduction in the reinforcement ratio of MMFX steel, did not affect the serviceability of these beams. Analysis shows that the ACI 318, CSA, and AASHTO LRFD design codes can closely predict the ultimate shear strength for beams reinforced with high performance steel having yield strength up to 100 ksi. The beams were also analyzed using a well-established Mo.
Shear Behavior Of Concrete Beams Reinforced With High Performance Steel Shear Reinforcement
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Author : Aruna Munikrishna
language : en
Publisher:
Release Date : 2008
Shear Behavior Of Concrete Beams Reinforced With High Performance Steel Shear Reinforcement written by Aruna Munikrishna and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with categories.
Keywords: MMFX, Shear.
Behavior Of High Performance Steel As Shear Reinforcement For Concrete Beams
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Author :
language : en
Publisher:
Release Date : 2004
Behavior Of High Performance Steel As Shear Reinforcement For Concrete Beams written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.
The objective of this research is to study the feasibility of using high performance steel as shear reinforcement for concrete beams. High performance steel is characterized by enhanced corrosion resistance and higher strength in comparison to conventional Grade 60 steel reinforcement. Advantages of using higher strength steel include the ability to design for longer span lengths and/or reducing the amount of material needed for design. This could greatly reduce the overall costs of construction for future structures. Nine reinforced concrete beams were constructed using No. 9 longitudinal bars and No. 3 bars for the stirrups. The main variables considered in the study are the stirrup spacing and the type of reinforcing steel material. Testing was performed using a single concentrated load positioned closer to one end of the beam, which allowed for two tests per beam. Research findings indicate that using MMFX stirrups increases the overall shear strength and enhances serviceability by distributing cracks and reducing crack width. Pairing high performance longitudinal and transverse reinforcement shows an optimum design in terms of strength gain and reduction in crack width. Enhanced serviceability behavior can be attributed to the better bond characteristics of MMFX steel in comparison to conventional Grade 60 steel. Test results suggest that combining high performance steel with high strength concrete could lead to a better utilization of the materials. Analysis shows that the ACI 318-05, CSA, and AASHTO LRFD design codes can conservatively be used for the design of high performance steel up to a yield strength of 80 ksi. Detailed analysis using the Modified Compression Field Theory can be used to accurately predict the behavior of the beams.
Behavior Of High Performance Steel As Shear Reinforcement For Concrete Beams
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Author : Matthew Scott Sumpter
language : en
Publisher:
Release Date : 2007
Behavior Of High Performance Steel As Shear Reinforcement For Concrete Beams written by Matthew Scott Sumpter and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.
Keywords: reinforced concrete beams, shear, high performance steel, MMFX, high strength, crack width.
Guide For The Design And Construction Of Concrete Reinforced With Fiber Reinforced Polymer Bars
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Author : ACI Committee 440
language : en
Publisher:
Release Date : 2003
Guide For The Design And Construction Of Concrete Reinforced With Fiber Reinforced Polymer Bars written by ACI Committee 440 and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Fiber-reinforced concrete categories.
Shear Behavior Of Steel Fiber Reinforced Prestressed Concrete Beams Without Shear Reinforcement
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Author : Jae-Sung Cho
language : en
Publisher:
Release Date : 2011
Shear Behavior Of Steel Fiber Reinforced Prestressed Concrete Beams Without Shear Reinforcement written by Jae-Sung Cho and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Fiber-reinforced concrete categories.
The ACI 318-08 building code allows to use the steel fiber reinforcement as alternative shear reinforcement with satisfying certain criteria when a beam is required minimum shear reinforcement. However, this provision applies to a nonprestressed and prestressed concrete beam such that it could be conservative since the shear strength of prestressed concrete beam is generally enhanced due to the prestressing force. This is due partially to the fact that the provision has been accepted based on researches, mostly conducted in nonprestressed concrete beam. Most of experiments conducted for prestressed concrete beam in small scale tests, with a height of specimens were less than 10 in. A larger scale of experiment is required due to concerns of size effect. In addition, in order to evaluate the qualification of a Steel Fiber Reinforced Concrete (SFRC) mixture used for structural applications, such as increasing shear resistance, a material evaluation method is essential. Currently ASTM or ACI Committee 544 (Fiber-Reinforced Concrete) does not recommend any standardized test method for evaluating shear performance of a particular SFRC material. This study addresses the research gaps described above by testing large-scale Steel Fiber Reinforced Prestressed Concrete (SFRPC) beams as well as developing a simple laboratory test techniques. A total 13 simply-supported beams for large-scale test with a shear span to effective depth ratio of 3.0 and a height of 24 in. were subjected to monotonically-increased, concentrated load. The test parameters were mainly included compressive strength, volume fraction of steel fibers, compressive reinforcement ratio. The results of large-scale test showed that the use of hooked steel fibers in a volume fraction greater than or equal to 0.50% volume fraction of steel fibers (67 lb per cubic yard), which is less than requirement by ACI 318-08 (0.75%, 100 lb per cubic yard), led to substantial enhancement of shear behaviors including the first cracking, the ultimate, and ductility. High compressive strength of SFRC, greater than 9000 psi, which is higher than ACI 318-08 requirement (less than 6000 psi) could be used as well. However, there was no significant effect from compressive reinforcement ratio. A simply shear test method for SFRC was proposed in this study. The test apparatus is almost exactly the same as the conventional ASTM bending test with only minor modification, in addition, it could simulate a pure shear stress by adjusting loading and support positions. By introducing a proper reinforcement for bending stress, it was possible to evaluate shear performance of SFRC with clear and uncomplicated shear stress field in the critical section.
On Shear Behavior Of Structural Elements Made Of Steel Fiber Reinforced Concrete
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Author : Estefanía Cuenca
language : en
Publisher: Springer
Release Date : 2014-12-27
On Shear Behavior Of Structural Elements Made Of Steel Fiber Reinforced Concrete written by Estefanía Cuenca and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-12-27 with Technology & Engineering categories.
This book sheds light on the shear behavior of Fiber Reinforced Concrete (FRC) elements, presenting a thorough analysis of the most important studies in the field and highlighting their shortcomings and issues that have been neglected to date. Instead of proposing a new formula, which would add to an already long list, it instead focuses on existing design codes. Based on a comparison of experimental tests, it provides a thorough analysis of these codes, describing both their reliability and weaknesses. Among other issues, the book addresses the influence of flange size on shear, and the possible inclusion of the flange factor in design formulas. Moreover, it reports in detail on tests performed on beams made of concrete of different compressive strengths, and on fiber reinforcements to study the influence on shear, including size effects. Lastly, the book presents a thorough analysis of FRC hollow core slabs. In fact, although this is an area of great interest in the current research landscape, it remains largely unexplored due to the difficulties encountered in attempting to fit transverse reinforcement in these elements.
Design Of Concrete Structures Using High Strength Steel Reinforcement
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Author : Bahram M. Shahrooz
language : en
Publisher: Transportation Research Board
Release Date : 2011
Design Of Concrete Structures Using High Strength Steel Reinforcement written by Bahram M. Shahrooz and has been published by Transportation Research Board this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Science categories.
TRB's National Cooperative Highway Research Program (NCHRP) Report 679: Design of Concrete Structures Using High-Strength Steel Reinforcement evaluates the existing American Association of State Highway and Transportation Officials (AASHTO) Load and Resistance Factor Design (LRFD) Bridge Design Specifications relevant to the use of high-strength reinforcing steel and other grades of reinforcing steel having no discernible yield plateau. The report also includes recommended language to the AASHTO LRFD Bridge Design Specifications that will permit the use of high-strength reinforcing steel with specified yield strengths not greater than 100 ksi. The Appendixes to NCHRP Report 679 were published online.
Shear Behaviour Of Concrete Slabs And Beams Reinforced With High Performance Astm A1035 Steel
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Author : Admasu S. Desalegne
language : en
Publisher:
Release Date : 2013
Shear Behaviour Of Concrete Slabs And Beams Reinforced With High Performance Astm A1035 Steel written by Admasu S. Desalegne and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Reinforced concrete categories.
High-performance steel bars manufactured to conform to ASTM A1035-11 have different metallurgy and microstructure than conventional reinforcing steel. These changes result in an effective yield strength significantly higher than conventional ASTM A615 steel while also being less susceptible to corrosion. Thus there is increasing interest in the use of ASTM A1035 steel to reduce life-cycle costs for new concrete structures. However, the lack of a well defined yield point for this material requires careful assessment of structural design models to ensure that they accurately account for influences from higher reinforcement strains. This research focuses on the behaviour of shear-critical concrete members containing ASTM A1035 steel reinforcement. Laboratory tests were completed for six slab strips and ten beams with overall heights ranging from 300 mm to 1000 mm and shear span to depth ratios of 3.0 - 3.6. In the current study the term "SLABS" refer to concrete members longitudinally reinforced with ASTM A1035 steel without stirrups and "BEAMS" refer to members with stirrups containing combinations of ASTM A1035 or Grade 420 steel. The influence on shear and deflection behaviour from the reinforcement configurations and the nonlinear stress-strain response of the ASTM A1035 steel were of primary interest. General analytical shear models were developed for members containing ASTM A1035 steel. Simplified design shear models were also developed where the longitudinal ASTM A1035 reinforcement is proportioned on the basis of 690 MPa yield strength. All models were validated using the new experimental test results and data from the literature. The proposed shear models were also compared with existing analytical and numerical models. Improved capacity predictions were obtained from models that directly account for the influence of reinforcement strains and member depth. It was observed that the service load deflections of beams were underestimated by existing code deflection models such as the ACI ITG-6R-10 direct deflection model. Based on parametric studies, general deflection model and simplified deflection equations were developed for the beams containing ASTM A1035 steel reinforcement. The equations were validated against test results and were shown to be useful for deflection calculations in the design industry.
Studies On Shear Strength Of High Performance Concrete Beams
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Author : P. Y. L. Kong
language : en
Publisher:
Release Date : 1997
Studies On Shear Strength Of High Performance Concrete Beams written by P. Y. L. Kong and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Bars (Engineering) categories.