Download or read book Finite element analysis of reinforced concrete shear walls strengthened with FRP sheets written by Holger Spiess and published by . This book was released on 1999 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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:

Download or read book Finite Element Analysis of Reinforced Concrete Shear Walls written by Chadchart Sittipunt and published by . This book was released on 1994 with total page 770 pages. Available in PDF, EPUB and Kindle. Book excerpt: The major objective of this study was to use the finite element method to study the cyclic response of slender, reinforced concrete shear walls. Material models which represent the cyclic response of concrete and reinforcing steel in shear walls were developed in this investigation. These material models were verified both at the element and structural levels; the results of the finite element analyses were compared with the experimental data from several experimental programs. After the material models had been satisfactorily tested and verified, the finite element method was used to extend the scope of the investigation of the response of slender reinforced concrete shear walls with different configurations, reinforcement details, and loading histories.

Download or read book Reinforced Concrete Deep Beams written by F K Kong and published by CRC Press. This book was released on 1991-05-01 with total page 305 pages. Available in PDF, EPUB and Kindle. Book excerpt: The contents of this book have been chosen with the following main aims: to review the present coverage of the major design codes and the CIRIA guide, and to explain the fundamental behaviour of deep beams; to provide information on design topics which are inadequately covered by the current codes and design manuals; and to give authoritative revie

Download or read book Finite Element Analysis of Reinforced Concrete Structures II written by Jeremy Isenberg and published by . This book was released on 1993 with total page 734 pages. Available in PDF, EPUB and Kindle. Book excerpt: This collection contains 10 papers discussing finite element analysis of reinforced concrete structures presented at an international workshop held in New York, New York, June 2-5, 1991.

Download or read book Modified Composite Application to Improve Strength and Ductility of Structural Components written by Umesh Shahu Shrestha and published by . This book was released on 2014 with total page 189 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present numerical study investigates the application of carbon fiber reinforced polymer (CFRP) composite sheets to improve strength and to explore the potential ductility enhancement of concrete and masonry structural components. Consequently, composite sheets used varied from normal to hybrid carbon fiber reinforced polymers and their applications were modified from completely to sequentially bonded sheets. Sudden debonding of fiber reinforced polymer (FRP) sheets from concrete members is one major concern. The present research investigates the bond stress distribution in CFRP-concrete interface during debonding failure and proposes an effective sequentially bonding CFRP sheets layout to improve load carrying capacity along with ductility. Previous studies revealed that the application of FRP sheets in strengthening reinforced concrete (RC) beams has improved their load carrying capacity but not the ductility. In this study, strengthening of reinforced concrete (RC) beams with hybrid CFRP sheets was proposed to enhance the load carrying capacity and change the brittle mode to ductile failure. Additionally, unreinforced masonry shear walls with openings were retrofitted with CFRP sheets to restore the loss in stiffness and flexural strength due to openings. To perform these investigations, complex three-dimensional nonlinear finite element analysis (FEA) models of structural elements such as concrete blocks, RC beams and unreinforced masonry shear walls strengthened with CFRP sheets were developed. Finite element results of proposed models are as follows: 1. The FEA model of CFRP-concrete block double shear test was able to provide a complete set of stress and strain distributions along the bond length which was not possible to obtain experimentally. FEA simulation was able to reveal the distribution of strain amplitude, providing guidance for accurate placement of strain gauges at critical locations during experiment. 2. FEA model of CFRP-concrete single bond test with sequential bonding was able to provide the changes in bond stress distribution compared to fully-bonded CFRP-concrete single bond test model. Some of the sequentially bonded FRP-concrete block models gained ductility along with load carrying capacity. 3. Through the retrofit of RC beam with hybrid instead of normal CFRP sheets the mode of failure changed from brittle flexural-shear debonding to ductile gradual rupture of hybrid CFRP sheets. 4. Masonry shear wall with vertical rectangular opening outperformed the masonry shear walls with square, circular and horizontal rectangular openings in terms of stiffness and lateral in-plane load carrying capacity. Masonry shear walls with multiple openings outperformed the single opening in terms of stiffness and lateral in-plane load carrying capacity. Regardless of the opening shapes, the proposed CFRP sheets layout around the opening of masonry shear walls was effective in improving their stiffness and strength.

Download or read book Finite Element Design of Concrete Structures written by Guenter Axel Rombach and published by Thomas Telford. This book was released on 2004 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt: In Finite Element Design of Concrete Structures: practical problems and their solutions the author addresses this blind belief in computer results by offering a useful critique that important details are overlooked due to the flood of information from the output of computer calculations. Indeed, errors in the numerical model may lead in extreme cases to structural failures as the collapse of the so-called Sleipner platform has demonstrated.

Download or read book The Finite Element Analysis of Reinforced Concrete Coupled Shear Walls written by Brian William Richardson and published by . This book was released on 1987* with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nonlinear Finite Element Analysis of Reinforced Concrete Structures Strengthened with FRP Laminates written by Kasidit Chansawat and published by . This book was released on 2003 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Horsetail Creek (HC) bridge is an example of an Oregon bridge that was classified as structurally deficient and was not designed to withstand earthquake (EQ) excitations. A fiber-reinforced polymer (FRP) rehabilitation was performed on the HC bridge to increase flexural and shear capacities for traffic loads. However, a seismic retrofit has not yet been accomplished for this bridge. Fully three-dimensional finite element (FE) models are developed to simulate and examine the structural behavior of both full-size reinforced concrete (RC) beams and the HC bridge using ANSYS. FE analyses are compared with tests of full-scale beams replicating the transverse beams of the HC bridge before and after FRP strengthening from linear and nonlinear ranges up to failure. The FE models can effectively predict the behavior of the beams, and analytical and experimental results correlate very well. For the FE analyses of the HC bridge, soil-structure interface modeling is incorporated to replicate the actual bridge boundary conditions. Truck loadings are applied to the FE model at different locations, as in the actual bridge test. A sensitivity study is performed by varying uncertain bridge parameters to develop an FE bridge model best representing the actual bridge conditions. The optimal FE model obtained from the sensitivity study can accurately predict the magnitudes and trends in the strains. After an optimal FE bridge model is established, a performance evaluation on the FRP strengthening of the HC bridge is conducted. Both unstrengthened and FRP-strengthened bridge models are subjected to two different types of loading; i.e., scaled gravity and scaled truck loads to failure. Comparisons of results show the improvement in structural performance due to FRP strengthening. A seismic risk-related investigation of the HC bridge is also carried out. Nonlinear time-history analyses are performed using EQ acceleration-time histories applied to the HC bridge model. The ground motions are appropriate to the Pacific Northwest site and scaled so that the response spectrum, within natural periods of interest, matches the 1996 AASHTO design response spectrum. Based on the analytical results, colunm confinement is recommended to increase ductility and reduce potential for substructure collapse in future seismic events.

Download or read book Nonlinear Finite Element Analysis of Reinforced Concrete Coupled Shear Walls written by Salah Eddine Djellab and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Strengthening of Reinforced Concrete Structures written by L C Hollaway and published by Elsevier. This book was released on 1999-03-05 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: The in situ rehabilitation or upgrading of reinforced concrete members using bonded steel plates is an effective, convenient and economic method of improving structural performance. However, disadvantages inherent in the use of steel have stimulated research into the possibility of using fibre reinforced polymer (FRP) materials in its place, providing a non-corrosive, more versatile strengthening system.This book presents a detailed study of the flexural strengthening of reinforced and prestressed concrete members using fibre reinforces polymer composite plates. It is based to a large extent on material developed or provided by the consortium which studied the technology of plate bonding to upgrade structural units using carbon fibre / polymer composite materials. The research and trial tests were undertaken as part of the ROBUST project, one of several ventures in the UK Government's DTI-LINK Structural Composites Programme.The book has been designed for practising structural and civil engineers seeking to understand the principles and design technology of plate bonding, and for final year undergraduate and postgraduate engineers studying the principles of highway and bridge engineering and structural engineering. - Detailed study of the flexural strengthening of reinforced and prestressed concrete members using fibre reinforced polymer composites - Contains in-depth case histories

Download or read book Non linear Finite Element Analysis and Parametric Investigation of Low rise Reinforced Concrete Shear Walls written by Nasir Navidpour and published by . This book was released on 2000 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A parametric study was carried out on 18 reinforced concrete shear walls to investigate the significance of design parameters on seismic response. The parameters included boundary elements and their reinforcement characteristics, web reinforcement ratios, concrete strength, steel yield strength, and axial load. The investigation was conducted using finite element analyses. Computer program ADINA was used to perform nonlinear analysis of concrete shear walls under axial load and incrementally increasing lateral forces. Material nonlinearities, including those of concrete, were modeled using ADINA material models. Four-node isoparametric plane stress elements were used to model concrete. Steel elements were modeled using two-node nonlinear truss elements. The applicability of the program and the accuracy of finite element models were first validated. This was done by comparing the results of six different shear walls with those obtained experimentally. The walls included three specimens tested by Maier at the Swiss Federal Institute of Technology in Zurich, Switzerland and three shear walls tested by Lefas et al. at Imperial College of Science and Technology, London, England. The analytical and experimental results showed very good agreement. The results of the parametric investigation indicate that the presence of boundary elements enhanced strength and deformability of shear walls significantly. Wall aspect ratio was also found to be an important parameter dictating the mode of behavior. The longitudinal reinforcement ratio in the boundary elements was found to be a good source of energy dissipation and had much greater influence on ultimate load capacity than the web reinforcement. When confinement of concrete was considered, both the ultimate load capacity and ductility of shear walls improved. The effects of increased axial compression and increased reinforcement yield level were to increase strength but reduce ductility.

Download or read book Strengthening and Rehabilitation of Civil Infrastructures Using Fibre Reinforced Polymer FRP Composites written by L C Hollaway and published by Elsevier. This book was released on 2008-07-18 with total page 415 pages. Available in PDF, EPUB and Kindle. Book excerpt: The repair of deteriorated, damaged and substandard civil infrastructures has become one of the most important issues for the civil engineer worldwide. This important book discusses the use of externally-bonded fibre-reinforced polymer (FRP) composites to strengthen, rehabilitate and retrofit civil engineering structures, covering such aspects as material behaviour, structural design and quality assurance.The first three chapters of the book review structurally-deficient civil engineering infrastructure, including concrete, metallic, masonry and timber structures. FRP composites used in rehabilitation and surface preparation of the component materials are also reviewed. The next four chapters deal with the design of FRP systems for the flexural and shear strengthening of reinforced concrete (RC) beams and the strengthening of RC columns. The following two chapters examine the strengthening of metallic and masonry structures with FRP composites. The last four chapters of the book are devoted to practical considerations in the flexural strengthening of beams with unstressed and prestressed FRP plates, durability of externally bonded FRP composite systems, quality assurance and control, maintenance, repair, and case studies.With its distinguished editors and international team of contributors, Strengthening and rehabilitation of civil infrastructures using fibre-reinforced polymer (FRP) composites is a valuable reference guide for engineers, scientists and technical personnel in civil and structural engineering working on the rehabilitation and strengthening of the civil infrastructure. - Reviews the use of fibre-reinforced polymer (FRP) composites in structurally damaged and sub-standard civil engineering structures - Examines the role and benefits of fibre-reinforced polymer (FRP) composites in different types of structures such as masonry and metallic strengthening - Covers practical considerations including material behaviour, structural design and quality assurance

Download or read book Concrete Solutions 2011 written by Michael Grantham and published by CRC Press. This book was released on 2011-09-08 with total page 870 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Concrete Solutions series of International Conferences on Concrete Repair began in 2003, with a conference held in St. Malo, France in association with INSA Rennes, followed by the second conference in 2006 ( with INSA again, at St. Malo, France), and the third conference in 2009 (in Padova and Venice, in association with the University of Pado

Download or read book Retrofitting of Concrete Structures by Externally Bonded FRPs With Emphasis on Seismic Applications written by fib Fédération internationale du béton and published by fib Fédération internationale du béton. This book was released on 2006-01-01 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: fib Bulletin 35 is the first bulletin to publish documentation from an fib short course. These courses are held worldwide and cover advanced knowledge of structural concrete in general, or specific topics. They are organized by fib and given by internationally recognized experts in fib, often supplemented with local experts active in fib. They are based on the knowledge and expertise from fib's ten Commissions and nearly fifty Task Groups. fib Bulletin 35 presents the course materials developed for the short course "Retrofitting of Concrete Structures through Externally Bonded FRP, with emphasis on Seismic Applications", given in Ankara and Istanbul in June 2005. The course drew on expertise both from outside Turkey and from the large pool of local experts on this subject. In most countries of the world, the building stock is ageing and needs continuous maintenance or repair. Moreover, the majority of existing constructions are deficient in the light of current knowledge and design codes. The problem of structural deficiency of existing constructions is especially acute in seismic regions, as, even there, seismic design of structures is relatively recent. The direct and indirect costs of demolition and reconstruction of structurally deficient constructions are often prohibitive; furthermore they entail a substantial waste of natural resources and energy. Therefore, structural retrofitting is becoming increasingly widespread throughout the world. Externally bonded Fibre Reinforced Polymers (FRPs) are rapidly becoming the technique of choice for structural retrofitting. They are cleaner and easier to apply than conventional retrofitting techniques, reduce disruption to the occupancy and operation of the facility, do not generate debris or waste, and reduce health and accident hazards at the construction site as well as noise and air pollution in the surroundings. fib Bulletin 35 gives state-of-the-art coverage of retrofitting through FRPs and presents relevant provisions from three recent standardisation milestones: EN 1998-3:2005 "Eurocode 8: Design of structures for earthquake resistance - Part 3: Assessment and retrofitting of buildings", the 2005 Draft of the Turkish seismic design code, and the Italian regulatory document CNR-DT 200/04, "Instructions for Design, Execution and Control of Strengthening Interventions by Means of Fibre-Reinforced Composites" (2004).

Download or read book Finite Element Simulation of Bonded and Mechanically Anchored Shear Interfaces of Externally Applied FRP Sheets to Concrete and Wood concrete Composites written by Alaa Al-Sammari and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Composite construction is prevalent in advanced structural systems where components of different materials are combined in the same structure to improve the performance of strong and economic structural sections. Maintaining continuity between the different structural components to produce monolithic structural behavior is challenging because of differences in the mechanical properties of these materials in terms of stiffness, strength, and ductility. The different components of the composite section are typically joined using adhesives and/or mechanical anchors to produce partial or full composite action. This dissertation discusses two types of shear interfaces intended to result in structural composite behavior. The first type of interface that is part of this dissertation focuses on bonded and mechanically anchored externally applied FRP sheets used in concrete structure for rehabilitation of concrete structures. The second type of connection is a new wood-concrete composite that includes a perforated steel connector bonded to engineered wood elements to transfer shear stresses to cast-in-place concrete. Fiber reinforced polymer (FRP) materials have been confirmed as an excellent option for strengthening existing or even newly constructed concrete structures. However, FRP sheets may debond before reaching a high level of FRP stress. This behavior adversely affects the efficiency of using FRP materials for strengthening concrete structures. FRP-anchors have been added to the bonded joints to delay or avoid debonding and allow FRP sheets to reach their ultimate strength. Yet, the behavior of carbon fiber anchors is not well understood, particularly the effect of the dimensional and geometric properties of the anchors on the total strength of FRP-concrete joints. Therefore, the influence of key anchor parameters on joint behavior were examined in this research through analytical simulations. The parameters investigated were; the number of anchors used in the joint, the distance between anchors, anchor shaft depth, anchor shaft diameter, anchor splay angle, and anchor splay diameter. A general-purpose finite element software (ABAQUS) was used to study the behavior of the anchored FRP-concrete joints having different anchor configurations and geometries. Different three-dimensional finite element models were used to describe the different components of the FRP-concrete joint. These different components were categorized based on the different materials, geometric shapes and functional roles of each part or component. Consequently, five different components were considered in the finite element models to represent the FRP-concrete joint. These components are the concrete substrate, the FRP sheet, the adhesive layer, the FRP anchor, and the adhesive envelopes around the anchors (for modeling the interface between concrete, FRP sheet, and the FRP anchors). Based on this study, design recommendations for fiber reinforced polymer anchors were developed to determine the number of anchors, distance between anchors, anchor shaft depth, anchor shaft diameter, anchor splay angle, and anchor splay diameter required to achieve a goal strength. The finite element analysis can be extended to model full-scale structural members strengthened with fiber-reinforced material under different loading conditions building on the findings from this research. The second type of composite application included in this dissertation focuses on new structural deck systems that benefit from the use of wood as a lightweight, sustainable substructure and concrete as a wear-resistant, vibration damping top element. These systems employ metallic connectors to transfer shear stresses between the wood and the concrete leading to full or partial composite action for strength and stiffness benefits. Results of finite element analysis and a parametric investigation are presented for one type of connector similar to those available commercially: a perforated steel plate of which half is epoxied into a groove in the wood member while the other half is embedded in a concrete slab. The analysis was first validated against experimental push-out tests performed on a commercial product and then employed to examine the effect of several parameters of the connection: thickness of plate; insulation gap between concrete and wood; depth of embedment in concrete; and depth of embedment in wood. the results showed that thickness predictably affects shear capacity as well as ductility and stiffness (slip moduli) of the connector. This dissertation highlights the importance of including parameters that affect the response of joints between dissimilar materials in order to properly capture their behavior through numerical models. The detailed parametric studies presented in this research can form the basis for development of design recommendations for these types of connections. Given the expense associated with laboratory experimentation, the tools used in this research provide an inexpensive complement to physical testing in the development of robust and reliable equations that can be incorporated into design standards.

Download or read book Adaptive Finite Element Analysis of Reinforced Concrete Plates and Shells written by Roman Lackner and published by . This book was released on 2000 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: