Behaviour Of Steel Fiber Reinforced Concrete Under Blast Load
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Behaviour Of Steel Fiber Reinforced Concrete Under Blast Load
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Author : Sakkasem Suwarnarat
language : en
Publisher:
Release Date : 2015
Behaviour Of Steel Fiber Reinforced Concrete Under Blast Load written by Sakkasem Suwarnarat and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with Finite element method categories.
Recent studies show that adding steel fiber into concrete will enhance tensile capacity especially in high strain-rate loading condition. This thesis shows the results from experiments and finite element analysis simulations for the responses of steel fiber reinforced concrete (SFRC) panels and normal reinforced concrete (NRC) panels subjected to blast loading. Two panels per fiber weight ratio of 0 (concrete without fiber), 30, and 60 kg per cubic meter were casted. Total of 6 panels were casted with controlled cementitious matrix strength within a range of 55-60MPa. The steel fiber used in this study is hook-type fiber with an aspect ratio of 80 which, from past study, found to have a good performance for impact loading. The concrete panels were subjected to blast load using TNT explosive weighing 1lb and 2 lb all at a fix stand-off distance of 0.5 meter. Deflection and acceleration responses were measured from the experiment. Simulation models were developed via finite element analysis program "ABAQUS". The experiment results showed that the SFRC panels possesses better resistance against blast loading than NRC panels.The analysis models were also proven to have good accuracy in predicting panels' responses.
Use Of Steel Fiber Reinforced Concrete For Blast Resistant Design
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Author : Deidra Kalman
language : en
Publisher:
Release Date : 2010
Use Of Steel Fiber Reinforced Concrete For Blast Resistant Design written by Deidra Kalman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
Reinforced concrete is a common building material used for blast resistant design. Adding fibers to reinforced concrete enhances the durability and ductility of concrete. This report examines how adding steel fibers to reinforced concrete for blast resistant design is advantageous. An overview of the behavior of blasts and goals of blast resistant design, and advantages of reinforced concrete in blast-resistant design, which include mass and the flexibility in detailing, are included in the blast resistant design section. The common uses for fiber-reinforced concrete, fiber types, and properties of fiber reinforced concrete varying with fiber type and length, and concrete strength are discussed in the fiber-reinforced concrete section. Two studies, Very High-Strength Concrete for Use in Blast-and-Penetration Resistant Structures and Blast Testing of Ultra-High Performance Fiber and FRP-Retrofitted Concrete Slabs, are reviewed. Lastly, the cost, mixing and corrosion limitations of using steel fiber-reinforced concrete are discussed. Reinforced concrete has been shown to be a desirable material choice for blast resistant design. The first step to designing a blast resistant reinforced concrete structure is to implement proper detailing to ensure that structural failures will be contained in a way that preserves as many lives as possible. To design for the preservation of lives, a list of priorities must be met. Preventing the building from collapse is the first of these priorities. Adding steel fibers to concrete has been shown to enhance the concrete's post-crack behavior, which correlates to this priority. The second priority is reducing flying debris from a blast. Studies have shown that the failure mechanisms of steel fiber reinforced concrete aid in reducing flying debris when compared to conventional reinforced concrete exposed to blast loading. The major design considerations in designing steel fiber reinforced concrete for blast resistant design include: the strength level of the concrete with fiber addition, fiber volume, and fiber shape. As research on this topic progresses, the understanding of these factors and how they affect the strength characteristics of the concrete will increase, and acceptance into the structural design industry through model building codes may be possible.
Performance Of Steel Fiber Reinforced Concrete Beams Under Shock Tube Induced Blast Loading
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Author : Steve Castonguay
language : en
Publisher:
Release Date : 2017
Performance Of Steel Fiber Reinforced Concrete Beams Under Shock Tube Induced Blast Loading written by Steve Castonguay and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.
This thesis focuses on the dynamic and static behavior of steel fiber-reinforced concrete (SRFC) beams. As part of this study a total of eighteen (18) beams are tested, including fourteen (14) SFRC beams, and a companion set of four (4) beams built without fibers. Seven (7) of the beams are tested under quasi-static (slowly applied) loading with the remaining eleven (11) beams tested under simulated blast loading using the University of Ottawa shock-tube. The variables considered in this study include: concrete type (SFRC vs. conventional concrete), fiber content, fiber type, as well as the effect of transverse reinforcement. The criteria used to evaluate the blast performance of the beams includes: overall blast capacity, maximum and residual mid-span displacement, secondary fragmentation and damage control. Static results confirm the beneficial effect of fibers on improving the shear and flexural capacity of beams. Dynamic results show that use of steel fibers at a sufficient content can increase shear capacity and effectively replace transverse reinforcement in beams tested under blast loads. The results also show that increasing fiber content can improve the blast response of the beams by reducing maximum and residual mid-span displacement, improving damage tolerance and minimizing secondary blast fragments. However, at high fiber contents, problems with workability of the concrete mix can occur, resulting in a reduction of improvements when compared to SFRC specimens with lower fiber content. The analytical research program aimed at predicting the response of the test beams using dynamic inelastic single-degree-of-freedom (SDOF) analysis. Overall the analytical results demonstrate that SDOF analysis can be used to predict the blast response of beams built with SFRC.
Performance Of Ultra High Performance Fiber Reinforced Concrete Columns Under Blast Loading
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Author : Frederic Dagenais
language : en
Publisher:
Release Date : 2016
Performance Of Ultra High Performance Fiber Reinforced Concrete Columns Under Blast Loading written by Frederic Dagenais and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
Fibre Reinforced Polymer Reinforcement For Concrete Structures
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Author : Kiang-Hwee Tan
language : en
Publisher: World Scientific
Release Date : 2003
Fibre Reinforced Polymer Reinforcement For Concrete Structures written by Kiang-Hwee Tan and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Technology & Engineering categories.
Fibre-reinforced polymer (FRP) reinforcement has been used in construction as either internal or external reinforcement for concrete structures in the past decade. This book provides the latest research findings related to the development, design and application of FRP reinforcement in new construction and rehabilitation works. The topics include FRP properties and bond behaviour, externally bonded reinforcement for flexure, shear and confinement, FRP structural shapes, durability, member behaviour under sustained loads, fatigue loads and blast loads, prestressed FRP tendons, structural strengthening applications, case studies, and codes and standards. Contents: .: Volume 1: Keynote Papers; FRP Materials and Properties; Bond Behaviour; Externally Bonded Reinforcement for Flexure; Externally Bonded Reinforcement for Shear; Externally Bonded Reinforcement for Confinement; FRP Structural Shapes; Volume 2: Durability and Maintenance; Sustained and Fatigue Loads; Prestressed FRP Reinforcement and Tendons; Structural Strengthening; Applications in Masonry and Steel Structures; Field Applications and Case Studies; Codes and Standards. Readership: Upper level graduates, graduate students, academics and researchers in materials science and engineering; practising engineers and project managers
Effect Of High Performance Concrete And Steel Materials On The Blast Performance Of Reinforced Concrete One Way Slabs
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Author : Christian Melançon
language : en
Publisher:
Release Date : 2016
Effect Of High Performance Concrete And Steel Materials On The Blast Performance Of Reinforced Concrete One Way Slabs written by Christian Melançon and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
Effects Of Detailing And Fibers On The Static And Blast Behaviour Of High Strength Concrete Beams
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Author : Charlemagne Junior Charles
language : en
Publisher:
Release Date : 2019
Effects Of Detailing And Fibers On The Static And Blast Behaviour Of High Strength Concrete Beams written by Charlemagne Junior Charles and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
The CSA S850 Blast standard provides guidelines that can be used to enhance the blast performance of reinforced concrete structures. In the case of beams, the standard requires the use of top continuity (compression) bars and well-detailed transverse steel to ensure strength and ductility under blast loads. However, the requirements in the CSA S850 standard are intended for normal-strength concrete structures. Given the increased use of high-strength concrete (HSC) in practice, there is a need to explore the effects of modern blast designs on the behavior of HSC structures subjected to blast loads. Accordingly, this project examines the effect of modern reinforcement detailing on the static, dynamic and post-blast performance of high-strength concrete beams. The study further examines the ability to use fibers to relax such detailing and simplify construction. A total of seventeen beams are tested. Static testing is conducted under four-point bending, with blast testing conducted using the University of Ottawa shock-tube. The post-blast behavior of the beams is assessed by conducting residual static tests on the blast-damaged specimens. The parameters investigated include the effects of: blast detailing vs. nominal detailing, steel fibers, the effect of longitudinal steel ratio (in compression and tension) and tie spacing. The results show that under static loads, the use of blast detailing significantly improves the flexural behavior of the beams in terms of ductility. Likewise, the provision of continuity (compression) bars and closely spaced ties is found to improve blast performance by better controlling displacements, increasing blast resistance, limiting damages and allowing for important post-blast residual capacity. The use of steel fibers and relaxed detailing (increased tie spacing) is found to increase resistance and improve cracking behavior under static loads, with an ability to match the blast performance of more heavily-detailed HSC specimens. The use of fibers also allowed for substantial post-blast capacity. Finally, the steel ratio (in tension, in compression and in the transverse direction) was found to affect the blast behavior of the HSC beams. In addition to the experiments, the analytical study predicts the static and blast response of the tested beams using sectional analysis and non-linear SDOF modeling. Results show that the analysis methodology was able to predict the static and blast responses of the blast-detailed and fiber-reinforced HSC beams with reasonable accuracy.
The Strength And Behavior Of Steel Fiber Reinforced Concrete Under Combined Tension Compression Loading
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Author : R. W. Meier
language : en
Publisher:
Release Date : 1983
The Strength And Behavior Of Steel Fiber Reinforced Concrete Under Combined Tension Compression Loading written by R. W. Meier and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with categories.
The addition of steel fibers to concrete-type materials has been shown to improve many of the engineering properties of those materials. Notable among them is an enhancement in the tensile strength of an otherwise weak and brittle material. Although much is known about the tensile strength of steel-fiber reinforced concrete (SFRC) under one-dimensional state of stress, little is known with regard to the strength behavior under multi-dimensional tension-compression loading. This is attributed to a lack of suitable equipment for simultaneously applying tensile and compressive stresses. The research program described herein is focused on developing such equipment to study the behavior of SFRC under combined loadings. A review of the state-of-the-art research on the tensile strength of SFRC is given and a review of various methods of applying tensile stresses to concrete specimens is presented. The problem is to be overcome in applying a pure principal tensile stress are discussed.
Performance Of High Strength Reinforced Concrete Columns Under Shock Tube Induced Blast Loading
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Author : Amer Hammoud
language : en
Publisher:
Release Date : 2017
Performance Of High Strength Reinforced Concrete Columns Under Shock Tube Induced Blast Loading written by Amer Hammoud and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.
Accounting for blast hazards has become one of the major concerns for civil engineers when analysing and designing structures. Recent terrorist attacks and accidental explosions have demonstrated the importance of mitigating blast effects on buildings to ensure safety, preserve life and ensure structural integrity. Innovative materials such as high-strength concrete, steel fibers, and high-strength steel offer a potential solution to increase resistance against extreme dynamic loading and improve the blast resilience of buildings. This thesis presents the results of an experimental and analytical study examining the effect of high-strength concrete, high-strength reinforcement and steel fibers on the blast behaviour of reinforced concrete columns. As part of the study, a total of seventeen reinforced concrete columns with different design combinations of concrete, steel fibers, and steel reinforcement were designed, constructed, and tested under gradually increasing blast loads using the University of Ottawa shock-tube facility. Criteria used to assess the blast performance of the columns and the effect of the test variables included overall blast capacity, mid-span displacements, cracking patterns, secondary fragmentation, and failure modes. The effect of concrete strength was found to only have a moderate effect on the blast performance of the columns. However, the results showed that benefits are associated with the combined use of high-strength concrete with steel fibers and high-strength reinforcement in columns tested under blast loads. In addition to the experimental program, a dynamic inelastic single-degree-of-freedom analysis was performed to predict the displacement response of the test columns. A sensitivity analysis was also conducted to examine the effect of various modelling parameters such as materials models, DIFs, and accumulated damage on the analytical predictions.
Performance Of Steel Fibre Reinforced Concrete Columns Under Shock Tube Induced Shock Wave Loading
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Author : Russell P. Burrell
language : en
Publisher:
Release Date : 2012
Performance Of Steel Fibre Reinforced Concrete Columns Under Shock Tube Induced Shock Wave Loading written by Russell P. Burrell and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Blast effect categories.
It is important to ensure that vulnerable structures (federal and provincial offices, military structures, embassies, etc) are blast resistant to safeguard life and critical infrastructure. In the wake of recent malicious attacks and accidental explosions, it is becoming increasingly important to ensure that columns in structures are properly detailed to provide the ductility and continuity necessary to prevent progressive collapse. Research has shown that steel fibre reinforced concrete (SFRC) can enhance many of the properties of concrete, including improved post-cracking tensile capacity, enhanced shear resistance, and increased ductility. The enhanced properties of SFRC make it an ideal candidate for use in the blast resistant design of structures. There is limited research on the behaviour of SFRC under high strain rates, including impact and blast loading, and some of this data is conflicting, with some researchers showing that the additional ductility normally evident in SFRC is absent or reduced at high strain loading. On the other hand, other data indicates that SFRC can improve toughness and energy-absorption capacity under extreme loading conditions. This thesis presents the results of experimental research involving tests of scaled reinforced concrete columns exposed to shock wave induced impulsive loads using the University of Ottawa Shock Tube. A total of 13 half-scale steel fibre reinforced concrete columns, 8 with normal strength steel fibre reinforced concrete (SFRC) and 5 with an ultra high performance fibre reinforced concrete (UHPFRC), were constructed and tested under simulated blast pressures. The columns were designed according to CSA A23.3 standards for both seismic and non-seismic regions, using various fibre amounts and types. Each column was exposed to similar shock wave loads in order to provide direct comparisons between seismic and non-seismically detailed columns, amount of steel fibres, type of steel fibres, and type of concrete. The dynamic response of the columns tested in the experimental program is predicted by generating dynamic load-deformation resistance functions for SFRC and UHPFRC columns and using single degree of freedom dynamic analysis software, RCBlast. The analytical results are compared to experimental data, and shown to accurately predict the maximum mid-span displacements of the fibre reinforced concrete columns under shock wave loading.