Experimental And Numerical Study Of Steel Fiber Reinforced Concrete Structures Subjected To Internal Explosion
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Experimental And Numerical Study Of Steel Fiber Reinforced Concrete Structures Subjected To Internal Explosion
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Author : Nikhil Vasant Moon
language : en
Publisher:
Release Date : 2020
Experimental And Numerical Study Of Steel Fiber Reinforced Concrete Structures Subjected To Internal Explosion written by Nikhil Vasant Moon and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.
This research investigates the effect of an accidental explosion of a steam boiler in a boiler room on steel fiber reinforced concrete (SFRC) structure in an industrial facility, using nonlinear analysis in ABAQUS FEA software. The mechanical properties of SFRC are calculated through testing at the UTA Civil Engineering Laboratory Building. Steel fiber dosages in concrete at different volume fractions are examined for the mechanical properties of concrete. In total, 9 (4" x 8") cylindrical specimens for compressive strength and modulus of elasticity test, 9 (4" x 8") cylindrical specimens for tensile strength test, and 9 (6" x 6" x 21") beam specimens for modulus of rupture test were produced and tested after 28 days of curing. Modulus of Elasticity is found for the different volume fractions of SRFC by stress vs strain curve from experimental tests. Adding 1% of steel fiber in concrete can increase the modulus of elasticity by 11%, compressive strength by 22%, tensile strength by 42%, and modulus of rupture by 32 %. Using the concrete properties obtained from experimental results, numerical analysis is done to find the effect of the Steam Boiler explosion on SFRC boiler room using nonlinear analysis in ABAQUS FEA software. Dynamic/Explicit loading condition is considered for analysis. It's found that adding 1% steel fiber by volume fraction can increase the overall capacity of concrete structure by 26%, decrease strain by 21%, and decrease the deflection by 23%. Parametric studies are also carried out at 1% SFRC by different arrangements of Steam Boiler closed room - with a rigid roof, with a frangible roof and circular vent in the roof. It's found that the reflected pressure due to explosion can be significantly reduced on the surrounding walls. In case, roof with circular vent the stresses decrease by 50%, strain decrease by 70% and with frangible roof stress decrease by 31%, strain by 38% and strain decrease by 38%.
Experimental And Numerical Study On Full Scale Precast Steel Fibre Reinforced Concrete Pipes
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Author : Nedal Mohamed
language : en
Publisher:
Release Date : 2015
Experimental And Numerical Study On Full Scale Precast Steel Fibre Reinforced Concrete Pipes written by Nedal Mohamed and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
Reinforced concrete (RC) pipes are widely used as open channels (non-pressurized pipes) for sewage and storm water conveyance. RC pipes have generally achieved a reliable long-term performance. Depending on multiple parameters (e.g. pipe diameter, pipe wall thickness, required strength, etc.) the pipe may have up to three welded reinforcement cages in order to resist anticipated loads. Each cage is an assembled unit of steel reinforcement consisting of circumferential and longitudinal bars or wires. The fabrication process of a steel cage reinforcement is time and labour consuming. Thus, eliminating the steel cage reinforcement will yield an overall reduction in the production cost of precast concrete pipes. Dispersed steel fibres can be an effective alternative for the reinforcement of concrete pipes. The aim of this study is to explore using steel fibres as reinforcement in dry-cast concrete pipes. Mechanical properties of dry-cast steel-fibre reinforced concrete (DCSFRC) fabricated using multiple steel fibre types at various dosages were characterized. Consequently, precast pipes reinforced with Dramix RC-65/35-CN and Dramix RC-80/60-CN fibres at various dosages were fabricated. An extensive experimental program was carried out in order to evaluate the structural performance of the full-scale steel fibre-reinforced concrete (SFRC) pipes that were produced in comparison to plain concrete (PC) and RC pipes. Precast pipes had internal diameters of 300, 450, and 600 mm as well as a Type C wall thickness. The structural performance of pipes was characterized using both the continuous and cyclic three-edge-bearing tests (TEBT). Furthermore, the soil-pipe interaction of buried full-scale SFRC pipes was investigated. Finally, a three dimensional non-linear finite element model of the TEBT of SFRC pipes was developed. Subsequently, a parametric study covering multiple pipe configuration and reinforcement parameters was conducted. Results showed that hooked-end fibres with the largest fibre aspect ratio (Dramix RC-80/60-CN) induced the best flexural performance of DCSFRC specimens while crimped fibres (Novocon XR) were the least effective in enhancing the flexural strength and post-peak behaviour of DCSFRC. The load carrying capacity of SFRC pipes increased with increased fibre dosage. Results of the TEBT for 300 mm diameter pipes showed that the reinforcement specified for Class V pipes in ASTM C76 Standard Specification For Reinforced Concrete Culvert, Storm Drain, And Sewer Pipe could be achieved using a steel fibre dosage of 20 kg/m3, while a fibre dosage of 30 kg/m3 was sufficient for 450 and 600 mm diameter pipes to satisfy the same strength class (Class V). Furthermore, provided using a sufficient fibre dosage, SFRC pipes exhibited higher residual strengths and less deformations than that of RC pipes when subjected to small to moderate loading levels. In addition, results showed that using a hybrid system of short (Dramix RC-65/35-CN) and long (Dramix RC-80/60-CN) fibres did not result in synergetic effects. Full-scale testing results of buried SFRC pipes indicated that the pipes could sustain live loads consisting of a fully loaded 625CL Standard Ontario Truck without exhibiting any cracks or significant deformations, even when the pipe was installed in the least quality installation type (Type IV). This indicated that the current design recommendations for the pipe wall thickness in ASTM C76 (Type C wall) are overly conservative. Furthermore, it was found that the post-cracking behaviour of buried SFRC pipes was more sensitive to the installation type than to the type of steel fibre reinforcement. Finally, the findings of the parametric study were presented in a tabular form that can be used as a design aid supplementary to the newly released ASTM C1765 Standard Specification for Steel Fiber Reinforced Concrete Culvert, Storm Drain, and Sewer Pipe. The experimental findings of this study should assist the precast concrete industry in producing more economical SFRC pipe without the need for costly and time consuming welded steel cage reinforcement. The numerical and analytical study findings provided a simple and rational tool for the design of such SFRC pipes.
Experimental And Numerical Analysis Of The Shear Failure In Steel Fibre Reinforced Concrete
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Author : Carles Ferrer i Boix
language : en
Publisher:
Release Date : 2003
Experimental And Numerical Analysis Of The Shear Failure In Steel Fibre Reinforced Concrete written by Carles Ferrer i Boix and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with categories.
El principal objectiu d'aquesta tesina ha estat el d'analitzar els efectes de les fissures i la seva propagació en el comportament mecànic d'un material quasi-fràgil com el formigó. Concretament tracta de la ruptura per tallant a Formigons Reforcats amb Fibres (FRF) en assajos de tipus "push-off" en probetes prismàtiques. L'anàlisi consta d'un estudi experimental mitjançant el qual s'ha estudiat el comportament en mode mixte de la ruptura així com d'una anàlisi numèrica per a determinar els paràmetres que controlen en el mode I de fractura a partir dels quals s'ha realitzat la modelització per elements finits dels assajos a tallant.
Structural Design For Physical Security
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Author : Task Committee on Structural Design for Physical Security
language : en
Publisher: ASCE Publications
Release Date : 1999-01-01
Structural Design For Physical Security written by Task Committee on Structural Design for Physical Security and has been published by ASCE Publications this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999-01-01 with Technology & Engineering categories.
Prepared by the Task Committee on Structural Design for Physical Security of the Structural Engineering Institute of ASCE. This report provides guidance to structural engineers in the design of civil structures to resist the effects of terrorist bombings. As dramatized by the bombings of the World Trade Center in New York City and the Murrah Building in Oklahoma City, civil engineers today need guidance on designing structures to resist hostile acts. The U.S. military services and foreign embassy facilities developed requirements for their unique needs, but these the documents are restricted. Thus, no widely available document exists to provide engineers with the technical data necessary to design civil structures for enhanced physical security. The unrestricted government information included in this report is assembled collectively for the first time and rephrased for application to civilian facilities. Topics include: determination of the threat, methods by which structural loadings are derived for the determined threat, the behavior and selection of structural systems, the design of structural components, the design of security doors, the design of utility openings, and the retrofitting of existing structures. This report transfers this technology to the civil sector and provides complete methods, guidance, and references for structural engineers challenged with a physical security problem.
Dynamic Behavior Of Soft And Hard Materials Volume 1
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Author : R. Velmurugan
language : en
Publisher: Springer Nature
Release Date : 2023-12-31
Dynamic Behavior Of Soft And Hard Materials Volume 1 written by R. Velmurugan and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-12-31 with Technology & Engineering categories.
This book comprises the select peer-reviewed proceedings of the 13th International Symposium on Plasticity and Impact Mechanics (IMPLAST) 2022, which was held at Indian Institute of Technology, Madras, to commemorate the 80th birthday of Prof. N K Gupta, IIT, Delhi. It aims to provide a comprehensive and broad-spectrum picture of the state-of-the-art research and development in diverse areas, such as constitutive relations, theories of plasticity, stress waves in solids, earthquake loading, high-speed impact problems, fire and blast loading, structural crashworthiness and failure, mechanics of penetration and perforation, among others. The contents focus on aspects of large deformations and failure of materials, including metals, composites, cellular, geomaterials, or concrete, and structures resulting from quasi-static earthquake, fire, impact, or blast loading. This book is a valuable resource for researchers and professionals working in academia and industry in the areas of mechanical, materials, and aerospace engineering.
Design Of Blast Resistant Buildings In Petrochemical Facilities
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Author : Society of Civil Engineers. Task Committee on Blast Resistant Design
language : en
Publisher: Amer Society of Civil Engineers
Release Date : 2010
Design Of Blast Resistant Buildings In Petrochemical Facilities written by Society of Civil Engineers. Task Committee on Blast Resistant Design and has been published by Amer Society of Civil Engineers this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Technology & Engineering categories.
This updated edition provides general guidelines for the structural design of blast-resistant petrochemical facilities. Information is provided for U.S. Occupational Safety and Health Administration (OSHA) requirements, design objectives, siting considerations, and load determination, and references cite sources of detailed information. Detailed coverage is provided for types of construction, dynamic material strengths, allowable response criteria, analysis methods, and design procedures. Typical details and ancillary considerations, such as doors and windows, are also included. A how-to discussion on the upgrade of existing buildings is provided for older facilities which may not meet current needs. Three example calculations are included to illustrate design procedures.
Reinforced Concrete Design With Frp Composites
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Author : Hota V.S. GangaRao
language : en
Publisher: CRC Press
Release Date : 2006-11-20
Reinforced Concrete Design With Frp Composites written by Hota V.S. GangaRao and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006-11-20 with Technology & Engineering categories.
Although the use of composites has increased in many industrial, commercial, medical, and defense applications, there is a lack of technical literature that examines composites in conjunction with concrete construction. Fulfilling the need for a comprehensive, explicit guide, Reinforced Concrete Design with FRP Composites presents specific informat
Uhpcc Under Impact And Blast
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Author : Qin Fang
language : en
Publisher: Springer Nature
Release Date : 2021-02-22
Uhpcc Under Impact And Blast written by Qin Fang and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-02-22 with Technology & Engineering categories.
This book is about the Ultra-high Performance Cementitious Composites (UHPCC), which is a relativity new type of cementitious materials. UHPCC has very low water-to-binder ratio, high amount of high-range water reducer, fine aggregates and high-strength steel or organic fibers. With the prominent mechanical properties, e.g., high compressive and tensile strength, high ductility, and high fracture energy, UHPCC has been becoming the most prospective construction cement-based material for both civil and military structures to resist high-speed projectile penetration, low-velocity impact and blast loadings. In this book, the related work conducted by authors on the static and dynamic mechanical properties, as well as the impact and blast resistance of UHPCC are presented. This book is written for the researchers, engineers and graduate students in the fields of protective structures and terminal ballistics.
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.
Experimental And Numerical Study Of Dynamic Material Properties Of Fibre Reinforced Concrete
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Author : Zhuo Xu
language : en
Publisher:
Release Date : 2011
Experimental And Numerical Study Of Dynamic Material Properties Of Fibre Reinforced Concrete written by Zhuo Xu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Fibrous composites categories.
[Truncated abstract] This thesis presents both numerical and experimental investigations on the dynamic resistance of fibre reinforced concrete (FRC) materials. The effects of fibre shapes, material properties and dosage on the dynamic properties of FRC, including the Dynamic Increase Factor (DIF) of both the compressive and tensile strength, dynamic stress-strain relationship, energy absorption capacity, fibre-metrics mesoscopic interaction and failure modes are studied through experimental tests and numerical simulations. The main content and achievement of this thesis are summarised blow. In Chapter two, a numerical method is developed to simulate dynamic impact tests on steel fibre reinforced concrete (SFRC) specimens to study the dynamic material properties of SFRC. In the analysis, an axisymmetric mesoscale SFRC model is developed with distinctive consideration of the fibres, aggregates and cement mortar to investigate the dynamic failure behaviour of SFRC material under impact loading at different strain rates. The aggregates are modelled with random size and distribution in the SFRC specimen. The hooked-end steel fibres are also randomly distributed in the specimen with random orientations. The developed model is used to numerically simulate a Split Hopkinson Pressure Bar Test (SHPB) on SFRC specimens. Numerical results are compared with available experimental data to verify the developed model. The comparison indicates that the mesoscale numerical model can reliably simulate SHPB tests on SFRC and concrete specimens. The developed numerical model is then used to perform a series of simulations of SFRC specimens with different volume fractions of steel fibres or without steel fibre under dynamic impact loads of different loading rates. From the numerical results, the influences of steel fibres on dynamic material properties, in particular the Dynamic Increase Factor (DIF), and on dynamic failure mechanism of SFRC are discussed. The DIF curves of SFRC with different steel fibre dosages are also derived from the numerical results. In Chapter three, drop-weight impact tests are conducted in UWA structural lab to study the dynamic compressive properties of FRC material with different types of fibres. The impact tests are conducted with an instrumented drop-weight impact system consisting of a hard steel drop weight, two 180 t fast response loadcells, a high-speed video camera, and a fast response data acquisition system. Seven fibre types with different shapes and material properties are considered in the study. They are synthetic fibres, undulated, cold rolled, flattened, hook-end, and two new spiral shape steel fibres developed in this study. A volume fraction of 1% fibre is used in all specimens. The impact forces on top and bottom of specimens are measured to investigate the axial inertia effects and the stress wave propagation effect. The high-speed video camera is used to capture the failure process, displacement and velocity responses of specimens. The images recorded are used to estimate the strain and strain rates of the test specimen by image analysis. The dynamic stress-strain relations and impact resistance of the tested specimens are compared...