Download or read book Shear Deformation Model for Reinforced Concrete Members written by Massoud Sedaghat and published by . This book was released on 1982 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Rational Approach Towards Modeling of Post peak Shear Deformation Behavior of Reinforced Concrete Frame Elements Within Finite Element Context written by Fawad Muzaffar Shaikh and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Inelastic response of reinforced concrete frame members to combined gravity and lateral loads involves the complex interaction of axial, moment and shear forces and deformations. Whereas there is a considerable body of experimental data and knowledge on the behavior of members that respond predominately in either inelastic shear or moment effects, the behavior of frame elements that are sensitive to combined shear-flexure interaction is less understood. At present, there is little agreement as to how to analyze the behavior of concrete frame elements that experience strength degradation under the combined nonlinear interaction of shear and moment. This study takes a closer look at existing analytical models that have been proposed for simulation of shear effects in frame elements. Experimental behavior of beam-columns as reported by other researchers is catalogued in order to develop an understanding of the actual physical behavior of concrete frame elements. Available experimental data of ductile and non-ductile columns is analyzed to identify key parameters which affect shear deformation behavior of beam-column elements. Bond slip penetration within the plastic hinge regions of the concrete frame elements is found to play a key role in causing shear failure and subsequent post-peak force deformation response of beam-columns. Existing concrete and steel material models are studied and an improved steel material model capable of simulating cyclic hardening, cyclic softening and mean stress relaxation is proposed. The proposed steel model is verified by comparing its simulated response with reported behavior of reinforcing bars. The suitability of the proposed steel material model to simulate random loading history is demonstrated. A numerical framework (i.e. kinematic description, solver routine and control algorithms), capable of simulating large rotation, large deformation, post-peak shear deformation behavior of frame elements is developed. A new analytical model for simulating shear deformation behavior of concrete frame elements subjected to axial, flexural and shear loading is proposed. While the modeling concepts are general, the implementation and verification of the proposed model is limited to two-dimensional response. The proposed element model is based on behavioral effects and parameters that are identified through careful analysis and interpretation of previously published tests of ductile and non-ductile beam-columns. This analytical model is then used along with the proposed numerical framework to simulate local and element level behavior of four non-ductile columns (tested by Sezen and Moehle at U.C. Berkeley), two ductile column stubs (tested by Ichinose, Imai, Okano and Ohashi at Nagoya Institute of Technology) and two beam specimens (tested by Popov, Bertero and Krawinkler at U.C. Berkeley). The proposed element formulation, along with the supporting computational framework (e.g., solution control algorithms), are shown to be capable and robust to simulate the post-peak response of beam-columns due to large flexural and shear deformations. The proposed formulation is shown to be capable of simulating the effect of cumulative flexural deformations, axial load and strength of longitudinal bars on shear strength of beam-columns. Complicated behavioral features, such as the opening of stirrups in non-ductile columns and degradation of aggregate interlock behavior with cycling, are captured in the analysis. The element model was shown to be capable of simulating the correct mode of failure observed in four tests of non-ductile columns. In addition, shear strain, stirrup strain and axial strain of beam-columns were simulated and compared with corresponding available experimental values. The values of the input parameters of the proposed element model were justified and the resulting response was compared with experimental behavior. Generally good agreement was observed between experimental and simulated values.

Download or read book Mixed Formulation Frame Element for Shear Critical Steel and Reinforced Concrete Members written by Afsin Saritas and published by . This book was released on 2006 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Influence of Member Size on the Shear Response of Reinforced Concrete Members written by Michael P. Collins and published by . This book was released on 1997 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes analytical and experimental studies focused on identifying those situations where the size effect in shear is significant in concrete members. When a series of geometrically similar reinforced concrete members fail in shear, the shear stress at failure sometimes substantially decreases as the size of the member increases. The authors conclude that columns which contain only small amounts of shear reinforcement, are subjected to low axial loads, and have ratios of column height to member thickness greater than about 2.5 are particularly sensitive to the size effect in shear. The report demonstrates that analytical methods based on the modified compression field theory are capable of predicting reasonably well the magnitude of the size effect in shear.

Download or read book Deformation Capacity and Shear Strength of Reinforced Concrete Members Under Cyclic Loading written by Adolfo Benjamin Matamoros and published by . This book was released on 2006 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: A joint technical session was organized by Joint ACI-ASCE Committees 441, Reinforced Concrete Columns, and 445, Shear and Torsion, during the American Concrete Institute's Fall 2004 Convention in San Francisco, CA. The goal of the technical session was to showcase recent developments in this area, with the hope that continued discussion will lead to improved models that are suitable for performance-based engineering. This symposium publication is a collection of technical articles presented at that meeting and represents an effort from Joint ACI-ASCE Committees 441 and 445 to continue the technical discussion on this topic. (From preface.)

Download or read book Dynamic Response of Reinforced Concrete Buildings written by Hajime Umemura and published by IABSE. This book was released on 1982 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Minimum Reinforcement in Concrete Members written by A. Carpinteri and published by Elsevier. This book was released on 1999-04-22 with total page 213 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ESIS-Technical Committee 9 on Concrete was established in 1990 and has met seven times. A proposal was put to European and extra-European laboratories entitled "Scale effects and transitional failure phenomena of reinforced concrete beams in flexure" which lead to several positive responses.The central topic discussed by the committee was that of the minimum reinforcement in concrete members. The minimum amount of reinforcement is defined as that for which "peak load at first concrete cracking" and "ultimate load after steel yielding" are equal. In this way, any brittle behaviour is avoided as well as any localized failure, if the member is not over-reinforced. In other words, there is a reinforcement percentage range, depending on the size-scale, within which the plastic limit analysis may be applied with its static and kinematic theorems.Carpinteri, Ferro, Bosco and El-Katieb propose a LEFM model, according to which reinforcement reactions are applied directly on the crack surfaces and a compatibility condition is locally imposed on the crack opening displacement in correspondence with the reinforcement. The theoretical model is found to provide a satisfactory estimate of the minimum percentage of reinforcement that depends on the scale and enables the element in flexure to prevent brittle failure.

Download or read book Modelling and Analysis of Reinforced Concrete Structures for Dynamic Loading written by Christian Meyer and published by Springer. This book was released on 2014-05-04 with total page 257 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive review of the material behavior of concrete under dynamic loads, especially impact and impuls, opens the volume. It is followed by a summary of the various analytical tools available to engineers interested in analyzing the nonlinear behavior of reinforced concrete members for dynamic load. These range from relatively simple and practice-oriented push-over analysis to sophisticated layered finite element models. Important design-related topics are discussed, with special emphasis on performance of concrete frames subjected to seismic loads. The significance of modern software systems is recognized by including extensive examples. For readers not current in dynamic analysis methods, an appendix contains a review of the mathematical methods most commonly used for such analysis.

Download or read book Shear and Punching Shear in RC and FRC Elements written by fib Fédération internationale du béton and published by fib Fédération internationale du béton. This book was released on 2010-12-01 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: fib Bulletin 57 is a collection of contributions from a workshop on "Recent developments on shear and punching shear in RC and FRC elements", held in Salò, Italy, in October 2010. Shear is one of a few areas of research into fundamentals of the behaviour of concrete structures where contention remains amongst researchers. There is a continuing debate between researchers from a structures perspective and those from a materials or fracture mechanics perspective about the mechanisms that enable the force flow through a concrete member and across cracks. In 2009, a Working Group was formed within fib Task Group 4.2 "Ultimate Limit State Models" to harmonise different ideas about design procedures for shear and punching. An important outcome of this work was the ensuing discussions between experts and practitioners regarding the shear and punching provisions of the draft fib Model Code, which led to the organization of the Salò workshop. Invited experts in the field of shear and FRC gave 18 lectures at the workshop that was attended by 72 participants from 12 countries in 3 different continents. The contributions from this conference as compiled in this bulletin are believed to represent the best of the current state of knowledge. They certainly are of general interest to fib members and especially helpful in the finalization of the 2010 fibModel Code. It is hoped that this publication will stimulate further research in the field, to refine and harmonize the available analytical models and tools for shear and punching design.

Download or read book Deformation Capacity and Shear Strength of Fiber Reinforced Cement Composite Flexural Members Subjected to Displacement Reversals written by Praveen Chompreda and published by . This book was released on 2005 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Design of Reinforced Concrete Buildings for Seismic Performance written by Mark Aschheim and published by CRC Press. This book was released on 2019-04-05 with total page 710 pages. Available in PDF, EPUB and Kindle. Book excerpt: The costs of inadequate earthquake engineering are huge, especially for reinforced concrete buildings. This book presents the principles of earthquake-resistant structural engineering, and uses the latest tools and techniques to give practical design guidance to address single or multiple seismic performance levels. It presents an elegant, simple and theoretically coherent design framework. Required strength is determined on the basis of an estimated yield displacement and desired limits of system ductility and drift demands. A simple deterministic approach is presented along with its elaboration into a probabilistic treatment that allows for design to limit annual probabilities of failure. The design method allows the seismic force resisting system to be designed on the basis of elastic analysis results, while nonlinear analysis is used for performance verification. Detailing requirements of ACI 318 and Eurocode 8 are presented. Students will benefit from the coverage of seismology, structural dynamics, reinforced concrete, and capacity design approaches, which allows the book to be used as a foundation text in earthquake engineering.

Download or read book Time Dependent Behaviour of Concrete Structures written by Raymond Ian Gilbert and published by CRC Press. This book was released on 2010-09-15 with total page 447 pages. Available in PDF, EPUB and Kindle. Book excerpt: Serviceability failures of concrete structures involving excessive cracking or deflection are relatively common, even in structures that comply with code requirements. This is often as a result of a failure to adequately account for the time-dependent deformations of concrete in the design of the structure. The serviceability provisions embodied in

Download or read book Design of Modern Highrise Reinforced Concrete Structures written by Hiroyuki Aoyama and published by World Scientific. This book was released on 2001 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the results of a Japanese national research project carried out in 1988-1993, usually referred to as the New RC Project. Developing advanced reinforced concrete building structures with high strength and high quality materials under its auspices, the project aimed at promoting construction of highrise reinforced concrete buildings in highly seismic areas such as Japan. The project covered all the aspects of reinforced concrete structures, namely materials, structural elements, structural design, construction, and feasibility studies. In addition to presenting these results, the book includes two chapters giving an elementary explanation of modern analytical techniques, i.e. finite element analysis and earthquake response analysis.

Download or read book Displacement based Seismic Design of Reinforced Concrete Buildings written by fib Fédération internationale du béton and published by fib Fédération internationale du béton. This book was released on 2003 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: A brief summary of the history of seismic design as given in chapter 1, indicates that initially design was purely based on strength or force considerations. When the importance of displacement, however, became better appreciated, it was attempted to modify the existing force-based approach in order to include considerations of displacement, rather than to totally reconsider the procedure on a more rational basis. In the last decade, then, several researchers started pointing out this inconsistency, proposing displacement-based approaches for earthquake engineering evaluation and design, with the aim of providing improved reliability in the engineering process by more directly relating computed response and expected structural performance. The main objective of this report is to summarize, critically review and compare the displacement - based approaches proposed in the literature, thus favouring code implementation and practical use of rational and reliable methods. Chapter 2 Seismic performance and design objectives of this report introduces concepts of performance levels, seismic hazard representation, and the coupling of performance and hazard to define performance objectives. In fact, for displacement analysis to be relevant in the context of performance-based design, the structural engineer must select appropriate performance levels and seismic loadings. A critical review of some engineering limit states appropriate to the different performance levels is therefore proposed. In chapter 3 Conceptual basis for displacement-based earthquake resistant design, the fundamental principles associated with displacement of the ground during an earthquake and the effects, in terms of displacement, in the structure, are reviewed. The historical development guides the presentation with a review of general linear and nonlinear structural dynamics principles, general approaches to estimate displacement, for both ground and structure, and finally a general presentation of the means to measure and judge the appropriateness of the displacements of the structure in section. Chapter 4 Approaches and procedures for displacement-based design can be somehow considered the fundamental part of the report, since a critical summary of the displacement - based approaches proposed by different researchers is presented there. Displacement - based design may require specific characterization of the input ground motion, a topic addressed in Chapter 5 Seismic input. In general, various pertinent definitions of input motion for non-code format analysis are included, while peak ground parameters necessary for code base shear equations are only addressed as needed for the definition of motion for analysis. Chapter 6 Displacement capacity of members and systems addresses the fundamental problem of evaluating the inelastic displacement capacity of reinforced concrete members and realistic values of their effective cracked stiffness at yielding, including effects of shear and inclined cracking, anchorage slip, bar buckling and of load cycling. In Chapter 7 Application and evaluation of displacement-based approaches, some of the many different displacement based design procedures briefly introduced in Chapter 4 are applied to various case studies, identifying and discussing the difficulties a designer may encounter when trying to use displacement based design. Results for five different case studies designed in accordance with eight different displacement based design methods are presented. Although in general case studies are considered a useful but marginal part of a state of the art document, in this case it has to be noted that chapter 7 is possibly the most innovative and fundamental part of the whole report. The conclusions of chapter 7 are the fundamental and essential conclusions of the document and allow foreseeing a bright future for displacement - based design approaches. The state-of-art report has been elaborated over a period of 4 years by Task Group 7.2 Displacement-based design and assessment of fib Commission 7Seismic design, a truly international team of experts, representing the expertise and experience of all the important seismic regions of the world. In October 2002 the final draft of the Bulletin was presented to the public during the 1st fibCongress in Osaka. It was also there that it was approved by fib Commission 7Seismic Design.

Download or read book Modeling of Inelastic Behavior of RC Structures Under Seismic Loads written by P. Benson Shing and published by ASCE Publications. This book was released on 2001-01-01 with total page 636 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the U.S.?Japan Seminar on Post-Peak Behavior of Reinforced Concrete Structures Subjected to Seismic Loads: Recent Advances and Challenges on Analysis and Design, held in Tokyo and Lake Yamanaka, Japan, October 25-29, 1999. Sponsored by the National Science Foundation, U.S.A.; Japan Society for the Promotion of Science; Japan Concrete Institute. This collection presents the latest ideas and findings on the inelastic behavior of reinforced concrete (RC) structures from the analysis and design standpoints. These papers discuss state-of-the-art concrete material models and analysis methods that can be used to simulate and understand the inelastic behavior of RC structures, as well as design issues that can improve the seismic performance of these structures. Topics include modeling of concrete behavior; modeling of RC structures (finite element approach and macro-element approach); and experimental studies, analysis, and design issues.

Download or read book Deformations in Flexure critical Reinforced Concrete Members written by Rebecca Lynn Kathleen Garratt and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The need to understand complex structural behaviour presents an opportunity to enhance modelling and design practices. Reinforced concrete is ubiquitous in our infrastructure; however, post-yielding deformation behaviour of reinforced concrete is not well understood. Post-yielding displacements are not used in traditional strength-based design, which focuses on providing adequate strength. A popular concept for seismic applications relies on accurately predicting the post-yielding deformations of elements. To implement such strategies requires further knowledge on how reinforced concrete members deform after yielding. The experimental program focused on measuring the components of deformation of a set of twelve reinforced concrete members. In these tests the reinforcement ratio and overall member depth were varied. The results support that shear strains play a significant role in predicting a member's overall displacement, as well as the shape of the deformed member. It is recommended that these results be used in the development and calibration of numerical analyses.

Download or read book Shear Behavior of Lightweight Concrete Columns Under Seismic Conditions written by M. J. Kowalsky and published by . This book was released on 1995 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report is the first in a series of reports on the seismic performance of lightweight concrete bridge substructure elements. Through a discussion of experimental studies on two test units and analytical investigations, the shear capacity of lightweight concrete bridge columns subjected to cyclic loading is presented. Also presented in this report is a revised model for quantifying the contribution of transverse steel to shear strength that is applicable to both lightweight and normal weight concrete. An alternative method for the evaluation of shear deformation for design and assessment purposes is presented which is also applicable to lightweight and normal weight concrete members.