Download or read book Shear Capacity of Composite Prestressed Concrete Beams written by Elzbieta Saran and published by . This book was released on 1989 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Interface Slip Behavior of Composite Prestressed Concrete Beams written by S. B. Nosseir and published by . This book was released on 1971 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report deals with the interface shear strength and slip behavior of post tensioned concrete composite beams. The interface between the two composite elements was positioned on the centroidal axis of the composite cross section. Eleven simply supported beams with 8-foot spans were statically loaded to failure. The effect of interface roughness and web reinforcement on relative slip between the composite elements was studied. Web reinforcement crossing the interface and roughness of interface decreased the rate of relative slip and allowed increased magnitudes of slip before failure. Interface roughness and web steel improved the integrity, strength, and energy-absorption capacity of the composite beams. The ultimate interface shear resistances determined from the tests were higher than those recommended by the ACI code. (Author).

Download or read book Prestressed Concrete written by N. Rajagopalan and published by Alpha Science Int'l Ltd.. This book was released on 2005 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book deals fundamentally with the basic philosophy, principles and the application of prestressing in structural elements. It also covers the detailed engineering of the structural elements with prestressing forces in terms of analysis and design. Different systems of prestressing, losses in prestressing and evaluation of capacity of prestressed concrete sections in flexure, shear and torsion, the force flow due to prestressing at anchorage zones, the time dependent effects due to creep and shrinkage of materials are explained. The design of prestressed concrete elements is covered with a holistic concept. In case of indeterminate structures, the effect of prestressing while satisfying the compatibility conditions has been clearly explained. The necessary philosophy and the design procedures of partially prestressed elements have been specifically dealt with. Accepted National and International Code provisions for design of prestressed concrete elements under the effect of the various loads have been elaborately discussed with worked out examples.

Download or read book Ultimate Horizontal Shear Strength of Prestressed Split Beams written by S. B. Nosseir and published by . This book was released on 1971 with total page 47 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report deals with the horizontal shear resistance and behavior of prestressed concrete composite beams when the interface is selected to pass through the centroid of the composite section. Composite beams proportioned in this manner are referred to as prestressed split beams. A total of eight simply supported split beams were statically tested with the major variables being interface roughness and reinforcement parameter r fy. (r and fy are the percent and yield point of the web reinforcement across the interface.) All test beams were posttensioned and grouted and had the same nominal dimensions. Beams with rough interfaces showed an increase in the ultimate horizontal shear strength of about 100 psi over that of 'duplicate' beams with smooth interfaces. The ductility and the energy absorption capacity increased with r fy. The ultimate horizontal shear strength for beams with r fy = 0 was in excess of 400 psi and increased at the rate of about 60 psi per 100 psi increase in r fy. The two beams with the highest value of r fy failed in flexure. In spite of developing slip at the interface, these two beams developed the calculated flexural resistance based on full composite action. The horizontal shear resistance of the test beams failing in horizontal shear was much higher than the computed values based on the ACl code. (Author).

Download or read book Design Procedures for the Use of Composites in Strengthening of Reinforced Concrete Structures written by Carlo Pellegrino and published by Springer. This book was released on 2015-08-25 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book analyses the current knowledge on structural behaviour of RC elements and structures strengthened with composite materials (experimental, analytical and numerical approaches for EBR and NSM), particularly in relation to the above topics, and the comparison of the predictions of the current available codes/recommendations/guidelines with selected experimental results. The book shows possible critical issues (discrepancies, lacunae, relevant parameters, test procedures, etc.) related to current code predictions or to evaluate their reliability, in order to develop more uniform methods and basic rules for design and control of FRP strengthened RC structures. General problems/critical issues are clarified on the basis of the actual experiences, detect discrepancies in existing codes, lacunae in knowledge and, concerning these identified subjects, provide proposals for improvements. The book will help to contribute to promote and consolidate a more qualified and conscious approach towards rehabilitation and strengthening existing RC structures with composites and their possible monitoring.

Download or read book Steel concrete Composite Beams for Buildings written by Colin Davies and published by John Wiley & Sons. This book was released on 1975 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book FRP Composites for Reinforced and Prestressed Concrete Structures written by Perumalsamy Balaguru and published by CRC Press. This book was released on 2008-11-05 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: High strength fibre composites (FRPs) have been used with civil structures since the 1980s, mostly in the repair, strengthening and retrofitting of concrete structures. This has attracted considerable research, and the industry has expanded exponentially in the last decade. Design guidelines have been developed by professional organizations in a number of countries including USA, Japan, Europe and China, but until now designers have had no publication which provides practical guidance or accessible coverage of the fundamentals. This book fills this void. It deals with the fundamentals of composites, and basic design principles, and provides step-by-step guidelines for design. Its main theme is the repair and retrofit of un-reinforced, reinforced and prestressed concrete structures using carbon, glass and other high strength fibre composites. In the case of beams, the focus is on their strengthening for flexure and shear or their stiffening. The main interest with columns is the improvement of their ductility; and both strengthening and ductility improvement of un-reinforced structures are covered. Methods for evaluating the strengthened structures are presented. Step by step procedures are set out, including flow charts, for the various structural components, and design examples and practice problems are used to illustrate. As infrastructure ages worldwide, and its demolition and replacement becomes less of an option, the need for repair and retrofit of existing facilities will increase. Besides its audience of design professionals, this book suits graduate and advanced undergraduate students.

Download or read book Vertical Shear Strength of Composite Prestressed Concrete Bridge Beams written by Ernest Walter Bennett and published by . This book was released on 1989 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Shear Capacity of Hollow Core Slabs on Flexible Supports written by Matti Pajari and published by . This book was released on 1994 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book PRESTRESSED CONCRETE written by MUTHU K. U. and published by PHI Learning Pvt. Ltd.. This book was released on 2016-01-18 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book begins with a brief introduction, helping the reader to understand the fundamentals of stress concept and prestressed concrete systems. The discussion then follows to explain the computation of different losses and estimation of ultimate flexural and shear strength. Important codal provisions viz. IS1343-2012, Eurocode EN2 and BSEN-1:2004 are also highlighted in this text. For clear understanding of the materials, the text is supported by a good number of figures and tables. Besides covering the important topics on design and analysis of anchorage zone stresses and analysis of continuous beam, the book also discusses composite construction and circular prestressing. The book is designed as a textbook for the senior level undergraduate and postgraduate students of civil engineering and construction technology. KEY FEATURES

Download or read book Prestressed Concrete written by Edward G. Nawy and published by . This book was released on 1999 with total page 968 pages. Available in PDF, EPUB and Kindle. Book excerpt: Of Step-by-Step Trial-and-Adjustment Procedure for the Service-Load Design of Prestressed Members -- Design of Composite Post-Tensioned Prestressed Simply Supported Section -- Ultimate-Strength Flexural Design -- Load and Strength Factors -- ACI Load Factors and Safety Margins -- Limit State in Flexure at Ultimate Load in Bonded Members: Decompression to Ultimate Load -- Preliminary Ultimate-Load Design -- Summary Step-by-Step Procedure for Limit at Failure Design of the Prestressed Members -- Ultimate Strength Design of Prestressed Simply Supported Beam by Strain Compatibility -- Strength Design of Bonded Prestressed Simply Supported Beam Using Approximate Procedures -- SI Flexural Design Expression -- Shear and Torsional Strength Design -- Behavior of Homogeneous Beams in Shear -- Behavior of Concrete Beams as Nonhomogeneous Sections -- Concrete Beams without Diagonal Tension Reinforcement -- Shear and Principal Stresses in Prestressed Beams -- Web-Shear Reinforcement -- Horizontal Shear Strength in Composite Construction -- Web Reinforcement Design Procedure for Shear -- Principal Tensile Stresses in Flanged Sections and Design of Dowel-Action Vertical Steel in Composite Sections -- Dowel Steel Design for Composite Action -- Dowel Reinforcement Design for Composite Action in an Inverted T-Beam -- Shear Strength and Web-Shear Steel Design in a Prestressed Beam -- Web-Shear Steel Design by Detailed Procedures -- Design of Web Reinforcement for a PCI Standard Double Composite T-Beam -- Brackets and Corbels.

Download or read book Composite Reinforced Concrete written by Rayner Walter Taylor and published by Thomas Telford Publishing. This book was released on 1979 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Design of Prestressed Concrete written by Stephen Charles Clavell Bate and published by . This book was released on 1976 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Performance of Composite Prestressed Concrete Beams written by David Francis Rogers and published by . This book was released on 1956 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of the project was to study the behaviour under load of a series of composite prestressed precast and cast-in-situ concrete beams, which were of a type likely to fail in diagonal tension, to determine whether the means of bonding the two sections of this type of beam is likely to affect adversely the load-carrying capacity of the beam. The tests were carried out on six composite prestressed precast and cast-in-situ concrete beams and one prestressed concrete beam used as a control. Subsidiary tests were carried out also to determine the compressive strength, tensile strength, and modulus of elasticity of the concrete for each section of each beam.

Download or read book Shear Strength of Some 30 year old Prestressed Beams Without Links written by D. W. Cullington and published by . This book was released on 1991 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Shear Strength of Full sized Prestressed Concrete Composite Bridge Beams written by Choon Jin Tay and published by . This book was released on 1983 with total page 1098 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Strength of Horizontal Shear Reinforcement with Limited Development written by Regina Nyambura Waweru and published by . This book was released on 2015 with total page 305 pages. Available in PDF, EPUB and Kindle. Book excerpt: In order for the composite action between the precast beam and the cast-in-place deck to be effective, sufficient horizontal (interface) shear strength needs to be provided at the interface of the two concrete elements to prevent slip. Horizontal shear strength is provided by three main components: the protrusions on the crack faces (cohesion/aggregate interlock), friction between the faces resulting from the normal compressive stress, and the dowel action of the reinforcing bars. AASHTO LRFD equation assumes that all reinforcement crossing the interface would be fully developed on both sides of the interface at ultimate shear strength. This study examines if adequate horizontal shear capacity is provided by a very short embedded length (approximately 2-in.) commonly used in composite slab and box bridge beams in Texas. A number of component test that included push-off test and bar pullout tests were conducted to evaluate each component of horizontal shear. Seven fullscale composite prestressed bridge beams were tested to evaluate the contribution of dowel action of the reinforcement on horizontal shear capacity. These beams included two beams designed according to the current TxDOT specifications and two beams designed without any horizontal shear reinforcement. The interface area was reduced in the last three full-scale beams so as to force a horizontal shear failure and hence obtain the horizontal shear strength in those specimens. Results revealed that although the component tests show that the interface reinforcement with 2-in. embedded length could not be fully developed, the full-scale tests (with reduced interface area) indicate that the actual boundary conditions in the composite beams could provide abundant confinement to develop the reinforcement. Experimental results show that current AASHTO provisions for horizontal shear in composite concrete beams could over-estimate the horizontal shear contribution from dowel action of the reinforcement and do not represent the true behavior of the horizontal shear resistance mechanism.