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Axial Behavior Of High Strength Reinforced Concrete Circular Columns Confined With Spirals
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Book Synopsis Axial Behavior of High-strength Reinforced Concrete Circular Columns Confined with Spirals by : Lonnie A. Marvel
Download or read book Axial Behavior of High-strength Reinforced Concrete Circular Columns Confined with Spirals written by Lonnie A. Marvel and published by . This book was released on 2008 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Axial Behavior of Reinforced Concrete Circular Columns Confined with Opposing Spirals by : Mohammad K. Al-Qattawi
Download or read book Axial Behavior of Reinforced Concrete Circular Columns Confined with Opposing Spirals written by Mohammad K. Al-Qattawi and published by . This book was released on 2004 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Behavior of Circular Concrete Columns Reinforced with FRP Bars and Stirrups by : Mohammad Afifi
Download or read book Behavior of Circular Concrete Columns Reinforced with FRP Bars and Stirrups written by Mohammad Afifi and published by . This book was released on 2013 with total page 237 pages. Available in PDF, EPUB and Kindle. Book excerpt: The behavior of concrete members reinforced with fiber reinforced polymer (FRP) bars has been the focus of many studies in recent years. Nowadays, several codes and design guidelines are available for the design of concrete structures reinforced with FRP bars under flexural and shear loads. Meanwhile, limited research work has been conducted to examine the axial behavior of reinforced concrete (RC) columns with FRP bars. Due to a lack of research investigating the axial behavior of FRP reinforced concrete columns, North American codes and design guidelines do not recommend using FRP bars as longitudinal reinforcement in columns to resist compressive stresses. This dissertation aims at evaluating the axial performance of RC compression members reinforced with glass FRP (GFRP) and carbon FRP (CFRP) bars and stirrups through experimental and analytical investigations. A total of twenty seven full scale circular RC specimens were fabricated and tested experimentally under concentric axial load. The 300 mm diameter columns were designed according to CAN/CSA S806-12 code requirements. The specimens were divided to three series; series I contains three reference columns; one plain concrete and 2 specimens reinforced with steel reinforcement. Series II contains 12 specimens internally reinforced with GFRP longitudinal bars and transverse GFRP stirrups, while series III includes specimens totally reinforced with CFRP reinforcement. The experimental tests were performed at the structural laboratory, Faculty of Engineering, University of Sherbrooke. The main objective of testing these specimens is to investigate the behavior of circular concrete columns reinforced with GFRP or CFRP longitudinal bars and transverse hoops or spirals reinforcement. Several parameters have been studied; type of reinforcement, longitudinal reinforcement ratio, the volumetric ratios, diameters, and spacing of spiral reinforcement, confinement configuration (spirals versus hoops), and lap length of hoops. The test results of the tested columns were presented and discussed in terms of axial load capacity, mode of failure, concrete, longitudinal, and transverse strains, ductility, load/stress-strain response, and concrete confinement strength through four journal papers presented in this dissertation. Based on the findings of experimental investigation, the GFRP and CFRP RC columns behaved similar to the columns reinforced with steel. It was found that, FRP bars were effective in resisting compression until after crushing of concrete, and contributed on average 8% and 13% of column capacity for GFRP and CFRP RC specimens, respectively. Also, the use of GFRP and CFRP spirals or hoops according to the provisions of CSA S806-12 yielded sufficient restraint against the buckling of the longitudinal FRP bars and provided good confinement of the concrete core in the post-peak stages. The axial deformability (ductility) and confinement efficiency can be better improved by using small FRP spirals with closer spacing rather than larger diameters with greater spacing. It was found that, ignoring the contribution of FRP longitudinal bars in the CAN/CSA S806-12 design equation underestimated the maximum capacity of the tested specimens. Based on this finding, the design equation is modified to accurately predict the ultimate load capacities of FRP RC columns. New factors [alpha][indice inférieur g] and [alpha][indice inférieur c] were introduced in the modified equation to account for the GFRP and CFRP bars compressive strength properties as a function in their ultimate tensile strength. On the other hand, proposed equations and confinement model were presented to predict the axial stress-strain behavior of FRP RC columns confined by FRP spirals or hoops. The model takes into account the effect of many parameters such as; type of reinforcement, longitudinal reinforcement ratio; transverse reinforcement configuration; and the volumetric ratio. The proposed model can be used to evaluate the confining pressure, confined concrete core stress, corresponding concrete strain, and stress-strain relationship. The results of analysis using the proposed confinement model were compared with experimental database of twenty four full-scale circular FRP RC columns. A good agreement has been obtained between the analytical and experimental results. Proposed equations to predict both strength and stress-strain behavior of confined columns by FRP reinforcements demonstrate good correlation with test data obtained from full-scale specimens.
Book Synopsis Experimental Evaluation of the Behavior of Spirally-reinforced High-strength Concrete Columns by : Annette M. Pieroni
Download or read book Experimental Evaluation of the Behavior of Spirally-reinforced High-strength Concrete Columns written by Annette M. Pieroni and published by . This book was released on 1995 with total page 169 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Performance Evaluation of High-strength Concrete Circular Columns Reinforced with GFRP Bars and Spirals by : Mu'taz Almomani
Download or read book Performance Evaluation of High-strength Concrete Circular Columns Reinforced with GFRP Bars and Spirals written by Mu'taz Almomani and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The results of fifteen large-scale high-strength concrete (HSC) columns internally reinforced with GFRP bars and spirals are presented in this thesis. The concrete dimensions and reinforcement of the columns satisfied all the minimum requirements of the relevant Canadian standards. The test parameters in this study include reinforcement type (steel or GFRP), spiral pitch (50 or 85 mm), slenderness ratio (14, 20 or 28), the level of axial load eccentricity (60, 90, 120 or 150 mm) and the loading type (axial or flexural loading). The experimental results were then compared to the predictions of the Canadian and American FRP design codes and guidelines. Compared to the GFRP-reinforced concrete (RC) counterpart, the steel-RC specimen achieved a higher axial capacity (7.8%) with very similar behaviour up to the peak load but a more ductile post-peak behaviour. Both spiral pitches were able to provide adequate confinement up to the peak load, however, the smaller pitch was able to provide a more deformable post-peak behaviour. As the slenderness ratio increased, the lateral displacement increased and the lateral and axial stiffness decreased. The effect of increasing axial load eccentricity was more pronounced than the increase in slenderness ratio and resulted in reduced axial and lateral stiffness. The GFRP reinforcement was able to contribute to the carrying load capacity of both the axially-loaded columns and those under flexure. No failure of any bars or spirals was observed with the exception of the shortest column under the least eccentricity. Under flexural loading, the spirals were able to provide adequate confinement at different loading stages until failure. When compared with the experimental results, the examined codes and guidelines were found to be conservative in predicting the capacities of the columns for all loading conditions and slenderness ratios.
Book Synopsis Behavior of Spirally Reinforced High Strength Concrete Columns Under Axial Loading by : David L. Montgomery
Download or read book Behavior of Spirally Reinforced High Strength Concrete Columns Under Axial Loading written by David L. Montgomery and published by . This book was released on 1996 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental investigation was conducted to study the behavior of spirally reinforced high strength concrete (HSC) columns subjected to axial compression loading. The main objective of the experiment was to investigate the effects of the volumetric ratio of spiral steel, the spiral spacing, the specimen size and the concrete strength on the strength and ductility performance of confined concrete. Behavior of the cover concrete, spiral reinforcement steel, and longitudinal reinforcing bars were also investigated to gain insight into the overall behavior of HSC columns. A total of 32 spirally reinforced HSC columns were tested, including ten 254 mm diameter columns with concrete strength f'c of 69.7 Mpa, nine 203 mm diameter columns with concrete strength f'c of 69.7 MPa, and thirteen 203 mm diameter columns with concrete strength f 'c of 89.8 MPa. Overall height of each specimen was four times the diameter. All of the specimens were reinforced longitudinally with five deformed reinforcement bars and laterally by various amounts of spiral reinforcement. An increase in the volumetric ratio of spiral steel resulted in increases in the strength and ductility of confined HSC, with the improvements in ductility being more pronounced. Reductions in spiral spacing resulted in improved strength and ductility of confined HSC when the volumetric ratio of spiral steel was sufficiently large. Increases in concrete strength were found to result in decreases in the peak strength enhancement, axial strain at peak strength, spiral stress at peak strength, and deformability of the specimens. Larger diameter columns achieved better participation of the cover concrete shell and had larger strengths at low axial strains. Cover concrete began spalling at lower concrete strengths and at earlier axial strains than expected in the columns with f'c of 89.8 MPa.
Book Synopsis Cyclic Behavior of Reinforced Concrete Circular Columns Confined with Opposing Spirals by : Wesley Turechek
Download or read book Cyclic Behavior of Reinforced Concrete Circular Columns Confined with Opposing Spirals written by Wesley Turechek and published by . This book was released on 2006 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Spirally-reinforced High-strength Concrete Columns by : Salvador Martinez Morales
Download or read book Spirally-reinforced High-strength Concrete Columns written by Salvador Martinez Morales and published by . This book was released on 1983 with total page 602 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Failure of Plain and Spirally Reinforced Concrete in Compression by : Frank Erwin Richart
Download or read book The Failure of Plain and Spirally Reinforced Concrete in Compression written by Frank Erwin Richart and published by . This book was released on 1929 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fiber-reinforced Composites by : P. K. Mallick
Download or read book Fiber-reinforced Composites written by P. K. Mallick and published by . This book was released on 1988 with total page 494 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Behavior of High-Strength Concrete Columns by :
Download or read book Behavior of High-Strength Concrete Columns written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of high-strength concrete for bridges and high-rise buildings become popular due to development in concrete technology and availability of various types of mineral and chemical admixtures. High-strength concrete could lead to smaller member sizes for compression members and therefore provide considerable savings associated with material costs and reduction of dead loads. However, Most of the current design codes, such as AASHTO-LRFD Bridge Specifications, are still based on tests conducted using normal-strength concrete. Many studies indicate that the behavior of columns with high-strength concrete is different from that of normal-strength concrete. The experimental phase of this investigation consists of thirty two rectangular and twenty four circular columns subjected to concentric and eccentric loading conditions to investigate the behavior of high-strength concrete columns. The main variables considered in this study were concrete strength ranging from 7.9 to 16.5 ksi, shape of cross section, and longitudinal and transverse reinforcement ratios. Using the test results of this study and other researches in literature, the dissertation provides design equation to predict the capacity of high-strength concrete columns with tie and spiral reinforcements subjected to concentric and eccentric loading conditions up to 18 ksi. The research also proposes a new stress-strain relationship of high-strength concrete confined with spiral reinforcements.
Book Synopsis Building Code Requirements for Structural Concrete (ACI 318-08) and Commentary by : ACI Committee 318
Download or read book Building Code Requirements for Structural Concrete (ACI 318-08) and Commentary written by ACI Committee 318 and published by American Concrete Institute. This book was released on 2008 with total page 471 pages. Available in PDF, EPUB and Kindle. Book excerpt: The quality and testing of materials used in construction are covered by reference to the appropriate ASTM standard specifications. Welding of reinforcement is covered by reference to the appropriate AWS standard. Uses of the Code include adoption by reference in general building codes, and earlier editions have been widely used in this manner. The Code is written in a format that allows such reference without change to its language. Therefore, background details or suggestions for carrying out the requirements or intent of the Code portion cannot be included. The Commentary is provided for this purpose. Some of the considerations of the committee in developing the Code portion are discussed within the Commentary, with emphasis given to the explanation of new or revised provisions. Much of the research data referenced in preparing the Code is cited for the user desiring to study individual questions in greater detail. Other documents that provide suggestions for carrying out the requirements of the Code are also cited.
Book Synopsis The Seismic Response of Well-confined Circular Reinforced Concrete Columns with Low Aspect Ratios by : Ngan Ha D. Vu
Download or read book The Seismic Response of Well-confined Circular Reinforced Concrete Columns with Low Aspect Ratios written by Ngan Ha D. Vu and published by . This book was released on 1999 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Behaviour of GFRP Reinforced Concrete Columns Under Combined Axial Load and Flexure by : Arjang Tavassoli
Download or read book Behaviour of GFRP Reinforced Concrete Columns Under Combined Axial Load and Flexure written by Arjang Tavassoli and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Development of Ultra-High Performance Concrete against Blasts by : Chengqing Wu
Download or read book Development of Ultra-High Performance Concrete against Blasts written by Chengqing Wu and published by Woodhead Publishing. This book was released on 2018-03-19 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: Development of Ultra-High Performance Concrete against Blasts: From Materials to Structures presents a detailed overview of UHPC development and its related applications in an era of rising terrorism around the world. Chapters present case studies on the novel development of the new generation of UHPC with nano additives. Field blast test results on reinforced concrete columns made with UHPC and UHPC filled double-skin tubes columns are also presented and compiled, as is the residual load-carrying capacities of blast-damaged structural members and the exceptional performance of novel UHPC materials that illustrate its potential in protective structural design. As a notable representative, ultra-high performance concrete (UHPC) has now been widely investigated by government agencies and universities. UHPC inherits many positive aspects of ultra-high strength concrete (UHSC) and is equipped with improved ductility as a result of fiber addition. These features make it an ideal construction material for bridge decks, storage halls, thin-wall shell structures, and other infrastructure because of its protective properties against seismic, impact and blast loads. Focuses on the principles behind UHPC production, properties, design and detailing aspects Presents a series of case studies and filed blast tests on columns and slabs Focuses on applications and future developments
Author :fib Fédération internationale du béton Publisher :fib Fédération internationale du béton ISBN 13 :9782883940543 Total Pages :178 pages Book Rating :4.9/5 (45 download)
Book Synopsis Externally Bonded FRP Reinforcement for RC Structures by : fib Fédération internationale du béton
Download or read book Externally Bonded FRP Reinforcement for RC Structures written by fib Fédération internationale du béton and published by fib Fédération internationale du béton. This book was released on 2001-01-01 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt: In December 1996, the then CEB established a Task Group with the main objective to elaborate design guidelines for the use of FRP reinforcement in accordance with the design format of the CEB-FIP Model Code and Eurocode2. With the merger of CEB and FIP into fib in 1998, this Task Group became fib TG 9.3 FRP Reinforcement for concrete structures in Commission 9 Reinforcing and Prestressing Materials and Systems. The Task Group consists of about 60 members, representing most European universities, research institutes and industrial companies working in the field of advanced composite reinforcement for concrete structures, as well as corresponding members from Canada, Japan and USA. Meetings are held twice a year and on the research level its work is supported by the EU TMR (European Union Training and Mobility of Researchers) Network "ConFibreCrete”. The work of fib TG 9.3 is performed by five working parties (WP): Material Testing and Characterization (MT&C) Reinforced Concrete (RC) Prestressed Concrete (PC) Externally Bonded Reinforcement (EBR) Marketing and Applications (M&A) This technical report constitutes the work conducted as of to date by the EBR party. This bulletin gives detailed design guidelines on the use of FRP EBR, the practical execution and the quality control, based on the current expertise and state-of-the-art knowledge of the task group members. It is regarded as a progress report since it is not the aim of this report to cover all aspects of RC strengthening with composites. Instead, it focuses on those aspects that form the majority of the design problems. several of the topics presented are subject of ongoing research and development, and the details of some modelling approaches may be subject to future revisions. as knowledge in this field is advancing rapidly, the work of the EBR WP will continue. Inspite of this limit in scope, considerable effort has been made to present a bulletin that is today’s state-of-art in the area of strengthening of concrete structures by means of externally bonded FRP reinforcement.
Book Synopsis ACI 440. 2R-17 Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Concrete Structures by : ACI Committee 440
Download or read book ACI 440. 2R-17 Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Concrete Structures written by ACI Committee 440 and published by . This book was released on 2017-04-27 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt:
