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Book Post Crack and Post Peak Behavior of Reinforced Concrete Members by Nonlinear Finite Element Analysis

Download or read book Post Crack and Post Peak Behavior of Reinforced Concrete Members by Nonlinear Finite Element Analysis written by Yi Wu and published by Open Dissertation Press. This book was released on 2017-01-27 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Post-crack and Post-peak Behavior of Reinforced Concrete Members by Nonlinear Finite Element Analysis" by Yi, Wu, 吳奕, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled POST-CRACK AND POST-PEAK BEHAVIOR OF REINFORCED CONCRETE MEMBERS BY NONLINEAR FINITE ELEMENT ANALYSIS Submitted by Wu Yi for the degree of Doctor of Philosophy at the University of Hong Kong in September 2006 This thesis investigates the post-crack and post-peak behavior of reinforced concrete members by using finite element analysis. To achieve this, a finite element code with displacement controlled iterative scheme is developed. The finite element code is able to represent the complete load-deflection curve of reinforced concrete member from the initial loading stage till the post-peak stage. Bond-slip interaction between concrete and longitudinal reinforcement is included. To validate the finite element code, experiments of reinforced concrete members with different longitudinal reinforcement, web reinforcement, concrete strength and axial compression are studied. Case studies show that if the bond-slip is neglected in the finite element analysis, the predicted load-deflection curve and crack pattern will give less accuracy. A study of the mesh size-effect of concrete element shows that the mesh should be fine enough in order to give better prediction. By including the bond element and using proper element size, the results show that the proposed finite element code gives a good description of the behavior of reinforced concrete members, including crack patterns and the load-deflection responses. i By using this finite element code, reinforced concrete beams with different concrete grade, steel ratio are studied to investigate the post-crack behavior of reinforced concrete members. The analysis demonstrates that the predicted load will be under-estimated after the concrete has cracked if the tension-stiffening effect is neglected in the section analysis. Based on the results obtained from the finite element analysis, three new concrete stress distribution blocks are proposed. Compared with the current design codes in which the contribution of cracked concrete in tension is simply neglected or other far more complicated methods proposed for the finite element analysis, the tension-stiffening effect can be taken into account in a simple manner in the proposed models for the section analysis of reinforced concrete beams. Several classic reinforced beams are adopted to validate the proposed models. The results show that the proposed models give a good description of the load-deflection behavior of the reinforced concrete members for cracked concrete. In the investigation of the post-peak behavior of reinforced concrete beams, it is found that beyond the ultimate strength, the strain reversal history of longitudinal reinforcement has significant effects on the load-deflection behavior of the member. The predicted load may be over-estimated for an under-reinforced concrete beam when the strain reversal history of longitudinal reinforcement is neglected. It is therefore suggested that the strain history effect should be included for more accurate prediction of the post-peak load-deflection curves of reinforced concrete members. The variation of curvature along the beam length is also investigated. It is shown that the phenomenon of curvature reversal occurs at the post-peak stage for over- reinforced concrete sections in a simply supported beam that is subjected to concen

Book Post cracking Behavior of Reinforced Concrete Deep Beams

Download or read book Post cracking Behavior of Reinforced Concrete Deep Beams written by Guillermo A. Riveros and published by . This book was released on 2005 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: A significant number of failures in reinforced concrete structures initiate in tension regions promoted by stress risers such as areas of high-stress concentrations or pre-existing cracks. Stable growth of these tensile cracks until peak loads is associated with the development of large zones of fracture (fracture process zone (FPZ)). The growth of the FPZ until peak load is reached introduces the effect of structural size on the failure loads. An energy approach based on fracture mechanics concepts can be used to rationally analyze and design for size effects in brittle failures. Current design equations were developed based on strength analysis (as in current American Concrete Institute (ACI)) where the margin of safety will be higher for smaller structures compared to larger ones. It is also conceivable that this approach would lead to unconservative designs for some very large structures (e.g., deep slabs for underground storage tanks). Since the empirical formulations of the code are based on data for normal strength concrete, it places a limit on the maximum strength that can be effectively used in the design equations. As a result, promising high-performance concrete cannot be used to its fullest potential. Revisions to the shear design formulations are needed to ensure uniform margin of safety for members of all sizes, strength, and geometries. The dissertation deals with the finite element analysis of reinforced concrete deep beams using nonlinear fracture mechanics. Development of a numerical model that incorporates compression and tension softening of concrete, bond slip between concrete and reinforcement, and the yielding of the longitudinal steel reinforcement is presented and discussed. The development also incorporates the Delaunay refinement algorithm to create a triangular topology that is then transformed into a quadrilateral mesh by the quad-morphing algorithm. These two techniques allow automatic remeshing using the discrete crack approach. Nonlinear fracture mechanics is incorporated using the fictitious crack model and the principal tensile strength for crack initiation and propagation. The model has been successful in reproducing the load deflections, cracking patterns, and size effects observed in experiments of normal- and high-strength concrete deep beams with and without shear reinforcement.

Book Finite Element Analysis of Prestressed Concrete Structures Using Post Tensioning Steel

Download or read book Finite Element Analysis of Prestressed Concrete Structures Using Post Tensioning Steel written by Yu Huang and published by Cambridge Scholars Publishing. This book was released on 2020-05-28 with total page 305 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book details the theory and applications of finite element (FE) modeling of post-tensioned (PT) concrete structures, and provides the updated MATLAB code (as of 2019). The challenge of modeling PT prestressed concrete structures lies in the treatment of the interface between the concrete and prestressing tendons. Using MATLAB, this study develops an innovative nonlinear FE formulation which incorporates contact techniques and engineering elements to considerably reduce the need of computational power. This FE formulation has the ability to simulate different PT frame systems with fully bonded, fully unbonded or partially bonded tendons, as well as actual sliding behavior and frictional effects in the tendons. It also allows for the accurate simulation of anchor seating loss.

Book Finite Element Analysis of Reinforced Concrete Structures

Download or read book Finite Element Analysis of Reinforced Concrete Structures written by Tadaaki Tanabe and published by Aci International. This book was released on 2001 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Post cracking Analysis of Reinforced Concrete Panels Including Tension Stiffening

Download or read book Post cracking Analysis of Reinforced Concrete Panels Including Tension Stiffening written by and published by . This book was released on 1990 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: In finite element analysis of reinforced concrete structures, the effect of bond forces between concrete and reinforcement, referred to as tension stiffening, is discussed. To account for ths phenomenon, the post-cracking constitutive model for concrete is modified by assigning a linear strain softening branch to its stress-strain curve in the tensil stress direction. For analyzing orthogonally reinforced concrete panels, a simple procedure for determining the termination strain of the softening branch is then developed. Appropriate constitutive models for steel and uncracked concrete along with the ost-cracking model to simulate the behavior of cracked reinforced concrete are implemented in a finite element program. Three othogonally reinforced concrete test panels subjected to pure shear loadings causing inclined cracking are analyzed. It is shown that the adopted numerical procedures are capable of predicting the post-crackingresponses, ultimate capacities, and modes of failure for the analyzed panels with good accuracy. The capabilities of the employed post-cracking model to simulate the crack shifting behavior observed during testing of a highly anisotropically reinforced panel is also demonstrated.

Book Nonlinear Finite Element Analysis of Solids and Structures

Download or read book Nonlinear Finite Element Analysis of Solids and Structures written by René de Borst and published by John Wiley & Sons. This book was released on 2012-07-25 with total page 481 pages. Available in PDF, EPUB and Kindle. Book excerpt: Built upon the two original books by Mike Crisfield and their own lecture notes, renowned scientist René de Borst and his team offer a thoroughly updated yet condensed edition that retains and builds upon the excellent reputation and appeal amongst students and engineers alike for which Crisfield's first edition is acclaimed. Together with numerous additions and updates, the new authors have retained the core content of the original publication, while bringing an improved focus on new developments and ideas. This edition offers the latest insights in non-linear finite element technology, including non-linear solution strategies, computational plasticity, damage mechanics, time-dependent effects, hyperelasticity and large-strain elasto-plasticity. The authors' integrated and consistent style and unrivalled engineering approach assures this book's unique position within the computational mechanics literature. Key features: Combines the two previous volumes into one heavily revised text with obsolete material removed, an improved layout and updated references and notations Extensive new material on more recent developments in computational mechanics Easily readable, engineering oriented, with no more details in the main text than necessary to understand the concepts. Pseudo-code throughout makes the link between theory and algorithms, and the actual implementation. Accompanied by a website (www.wiley.com/go/deborst) with a Python code, based on the pseudo-code within the book and suitable for solving small-size problems. Non-linear Finite Element Analysis of Solids and Structures, 2nd Edition is an essential reference for practising engineers and researchers that can also be used as a text for undergraduate and graduate students within computational mechanics.

Book Nonlinear Finite Element Analysis of Reinforced Concrete Deep Members

Download or read book Nonlinear Finite Element Analysis of Reinforced Concrete Deep Members written by Riadh Saleh Hassan Al-Mahaidi and published by . This book was released on 1978 with total page 806 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Finite Element Prediction of Reinforced Concrete Behavior

Download or read book Finite Element Prediction of Reinforced Concrete Behavior written by Subramaniam Balakrishnan and published by . This book was released on 1986 with total page 487 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Nonlinear Finite Element Analysis of Reinforced Concrete Subassemblages

Download or read book Nonlinear Finite Element Analysis of Reinforced Concrete Subassemblages written by Amir S. Ayoub and published by . This book was released on 1995 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Finite Element Modelling of Structural Concrete

Download or read book Finite Element Modelling of Structural Concrete written by Michael D. Kotsovos and published by CRC Press. This book was released on 2015-05-20 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: A Powerful Tool for the Analysis and Design of Complex Structural ElementsFinite-Element Modelling of Structural Concrete: Short-Term Static and Dynamic Loading Conditions presents a finite-element model of structural concrete under short-term loading, covering the whole range of short-term loading conditions, from static (monotonic and cyclic) to

Book Modeling of structure reinforced and prestressed concrete in computer programs recommendations for mechanical splices of reinforcing bars

Download or read book Modeling of structure reinforced and prestressed concrete in computer programs recommendations for mechanical splices of reinforcing bars written by FIB – International Federation for Structural Concrete and published by FIB - International Federation for Structural Concrete. This book was released on 1990-05-01 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Non Linear Mechanics of Reinforced Concrete

Download or read book Non Linear Mechanics of Reinforced Concrete written by K. Maekawa and published by CRC Press. This book was released on 2003-09-02 with total page 768 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes the application of nonlinear static and dynamic analysis for the design, maintenance and seismic strengthening of reinforced concrete structures. The latest structural and RC constitutive modelling techniques are described in detail, with particular attention given to multi-dimensional cracking and damage assessment, and their practical applications for performance-based design. Other subjects covered include 2D/3D analysis techniques, bond and tension stiffness, shear transfer, compression and confinement. It can be used in conjunction with WCOMD and COM3 software Nonlinear Mechanics of Reinforced Concrete presents a practical methodology for structural engineers, graduate students and researchers concerned with the design and maintenance of concrete structures.