Studies On Shear Strength Of High Performance Concrete Beams
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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.
Shear Strength Of High Performance Concrete Beams
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Author : Paul Yeow Liong Kong
language : en
Publisher:
Release Date : 1996
Shear Strength Of High Performance Concrete Beams written by Paul Yeow Liong Kong and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with categories.
The loading configurations included using one, two or four symmetrically placed concentrated loads on simply supported spans. The theory predicted the shear strength of the beams in the present study well. When beams from previous investigations were included, the theory also gave good prediction of the shear strength. Apart from this, comparisons of shear strength were also made with the predictions by the shear design provisions contained in the Australian Standard AS 3600 (1994), American Concrete Institute Building Code ACI 318-95, Eurocode EC2 Part 1 and Canadian Standard CSA A23.3-94. The AS 3600 method was found to give the best correlation with the test results among all the code methods.
Evaluation Of Shear Strength Of High Strength Concrete Beams
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Author : Attaullah Shah
language : en
Publisher: LAP Lambert Academic Publishing
Release Date : 2012-08-01
Evaluation Of Shear Strength Of High Strength Concrete Beams written by Attaullah Shah and has been published by LAP Lambert Academic Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-08-01 with categories.
The book is recommended for the research graduate students perusing their research in the fields of high performance and high strength concrete with special reference to shear properties. The findings of the research can also be used by the graduate students interested in the in-depth analysis of Building Codes provisions of High Strength and High Performance Concrete. The book is recommended for use of the students interested to study the behavior of High Strength Concrete beams as well. The book involves analytical study of the high strength concrete beams on the basis of various parameters such as longitudinal steel ratio, shear span to depth ratio, web reinforcement etc. The contribution of web steel to the shear capacity of the beams has also been analyzed. 70 beams have been tested to verify these parameters. The results of the shear capacity of the high strength concrete beams have been compared with the provisions of the various building and bridges codes, most commonly practiced by the designers and engineers of concrete structures. The study of disturbed region in concrete structures provides the basic knowledge for the detailed research by the interested students....
Shear And Fracture Behavior Of High Performance Concretes
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Author : Mahdi Arezoumandi
language : en
Publisher:
Release Date : 2013
Shear And Fracture Behavior Of High Performance Concretes written by Mahdi Arezoumandi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Concrete categories.
"Concrete is the most widely used man-made material in the world. Like other materials, it has been improved over time. Nowadays, with continued development of science and technology, a new generation of concretes is produced and is termed high performance concretes. A review of previously published work indicates that very few studies (in some cases none) have addressed the structural behavior of full-scale, high performance concrete elements. This study investigated the shear and fracture behavior of two types of high performance concrete - high-volume fly ash concrete (HVFAC) and self-consolidating concrete (SCC). The HVFAC incorporates up to 70% cement replacement with fly ash, and the SCC is based on using only chemical admixtures to convert a conventional concrete (CC) mix to a SCC mix with all of the necessary passing, filling, flowability, and stability requirements typically found in SCC. This experimental program consisted of 16 shear beams (12 without shear reinforcing and four with shear reinforcing in the form of stirrups) and also 16 fracture mechanics beams for each type of concrete investigated (HVFAC and SCC). Additionally, three different longitudinal reinforcement ratios were evaluated within the test matrix of shear beams. The shear beams were tested under a simply supported four-point loading condition. Results of this study showed that the HVFAC had higher shear strength and fracture energy compared with the CC, while the SCC showed higher fracture energy, but the same shear strength as the CC"--Abstract, page iv.
High Performance Concrete
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Author :
language : en
Publisher:
Release Date : 1999
High Performance Concrete written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Technology & Engineering categories.
Response Of Ultra High Performance Fiber Reinforced Concrete Beams Under Flexure And Shear
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Author : Roya Solhmirzaei
language : en
Publisher:
Release Date : 2021
Response Of Ultra High Performance Fiber Reinforced Concrete Beams Under Flexure And Shear written by Roya Solhmirzaei and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with Electronic dissertations categories.
Ultra high performance concrete (UHPC) is an advanced cementitious material made with low water to binder ratio and high fineness admixtures, and possesses a unique combination of superior strength, durability, corrosion resistance, and impact resistance. However, increased strength of UHPC results in a brittle behavior. To overcome this brittle behavior of UHPC and improve post cracking response of UHPC, steel fibers are often added to UHPC and this concrete type is designated as Ultra High Performance Fiber Reinforced Concrete (UHPFRC). Being a relatively new construction material, there are limited guidelines and specifications in standards and codes for the design of structural members fabricated using UHPFRC. To develop a deeper understanding on the behavior of UHPFRC flexural members, seven beams made of UHPFRC are tested under different loading conditions. The test variables include level of longitudinal reinforcement, type of loading (shear and flexure), and presence of shear reinforcement. Further, a finite element based numerical model for tracing structural behavior of UHPFRC beams is developed in ABAQUS. The developed model can account for the nonlinear material response of UHPFRC and steel reinforcement in both tension and compression, as well as bond between concrete and reinforcing steel, and can trace the detailed response of the beams in the entire range of loading. This model is validated by comparing predicted response parameters including load-deflection, load-strain, and crack propagation against experimental data obtained from tests on UHPFRC beams with different material characteristics and under different loading configurations. The validated model is applied to conduct a set of parametric studies to quantify the effect of different parameters on structural response of UHPFRC beams, including the contribution of stirrups and concrete to shear capacity of beams, to explore feasibility of removing the need for shear reinforcement in UHPFRC beams. Results from experiments and numerical model reveal that UHPFRC beams exhibit distinct cracking pattern characterized by the propagation of multiple micro cracks followed by widening of a single crack leading to failure. Also, UHPFRC beams exhibit high flexural and shear capacity, as well as ductility due to high compressive and tensile strength of UHPFRC and fiber bridging developing at the crack surfaces that leads to strain hardening in UHPFRC after cracking. Thus, absence of shear reinforcement in UHPFRC beams does not result in brittle failure, even under dominant shear loading. Data from the conducted experiments as well as those reported in literature is utilized to develop a machine learning (ML) framework for predicting structural response of UHPFRC beams. On this basis, a comprehensive database on reported tests on UHPFRC beams with different geometric, fiber properties, loading and material characteristics is collected. This database is then analyzed utilizing different ML algorithms, including support vector machine, artificial neural networks, k-nearest neighbor, support vector machine regression, and genetic programing, to develop a data-driven computational framework for predicting failure mode and flexural and shear capacity of UHPFRC beams. Predictions obtained from the proposed framework are compared against the values obtained from design equations in codes, and also results from full-scale tests to demonstrate the reliability of the proposed approach. The results clearly indicate that the proposed ML framework can effectively predict failure mode and flexural and shear capacity of UHPFRC beams with varying reinforcement detailing and configurations. The research presented in this dissertation contributes to the development of preliminary guidance on evaluating capacity of UHPFRC beams under different configurations.
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.
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.
Analysis Of Shear Failure In Ultra High Performance Concrete Beams
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Author : Kevin J. Conway
language : en
Publisher:
Release Date : 2022
Analysis Of Shear Failure In Ultra High Performance Concrete Beams written by Kevin J. Conway and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with categories.
The purpose of this research is to test a series of UHPC specimens to investigate the shear failure responses in beams. Additionally, this research will also investigate the tensile properties of UHPC to assist in determining the relevant shear properties. Two series of specimens were created for testing: small-scale beam specimens for load-displacement behavior analysis under four-point bending and UHPC prisms for determining the effects of tension stiffening. Both sets of specimens were created using ASTM Grade 60 steel and high strength steel for the primary reinforcement. Finally, numerical analyses using finite element analysis software, based on both continuum and macroelement models, of the UHPC specimens were carried out based on the modified compression field theory (MCFT) to verify and expand upon the experimental results.
Shear Capacity Of Beams Of Reinforced High Performance Concrete
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Author : Henrik Gabrielsson
language : en
Publisher:
Release Date : 1993
Shear Capacity Of Beams Of Reinforced High Performance Concrete written by Henrik Gabrielsson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with categories.