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Author: Vishesh Dr Vikas
Publisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages : 0
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Book Description
Many reinforced concrete (RC) buildings built prior to implementation of seismic design provisions in the 1970s are non-ductile and are at risk of excessive damage or even collapse during a major earthquake. In this dissertation study, a low damage retrofit scheme for non-code performing RC shear walls was investigated. In the retrofit scheme, traditional monolithic RC shear walls were converted into rocking walls by introducing a cold joint at the wall foundation interface and by adding external post-tensioning. Two retrofitted rectangular RC shear walls were tested in laboratory to investigate the proposed retrofit scheme. The retrofitted shear walls showed minimized damage, improved self-centering but lower energy dissipation capacity in comparison to the benchmark shear wall. A novel scheme using Ultra-High-Performance Concrete (UHPC) was proposed and investigated using laboratory testing and finite element (FE) simulation to anchor external PT elements to existing foundation in the retrofitted shear walls. Four anchorage specimens, that were designed to anchor 2/5th of the maximum PT force expected in the retrofitted shear walls, were subjected to laboratory testing. 3D FE models were calibrated based on the measured response and were used to investigate the proposed anchorage scheme at full-scale. The current code provisions to limit residual drift and predict critical concrete strains in precast rocking shear walls were examined based on published results. The provisions on residual drift were found to be satisfactory for hybrid rocking walls. Two code-conforming rectangular hybrid rocking shear walls were tested in the laboratory to provide improve alternative for predicting plastic hinge length in rocking walls, which is critical in estimating critical concrete strain.Laboratory testing of precast rocking shear walls has been limited to rectangular cross section. This dissertation addresses the gap in literature by testing a T-shaped precast rocking shear wall. The test specimen was designed in accordance with current design guidelines, at one-third scale of a prototype wall and tested under multi-directional loading up to 1.50% drift. Test observations showed damage to be limited at the rocking corners. The measured residual drift was lower than 0.25% and the measured energy dissipation ratio exceeded the prescribed limit of 12.5%.
Author: Vishesh Dr Vikas
Publisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages : 0
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Book Description
Many reinforced concrete (RC) buildings built prior to implementation of seismic design provisions in the 1970s are non-ductile and are at risk of excessive damage or even collapse during a major earthquake. In this dissertation study, a low damage retrofit scheme for non-code performing RC shear walls was investigated. In the retrofit scheme, traditional monolithic RC shear walls were converted into rocking walls by introducing a cold joint at the wall foundation interface and by adding external post-tensioning. Two retrofitted rectangular RC shear walls were tested in laboratory to investigate the proposed retrofit scheme. The retrofitted shear walls showed minimized damage, improved self-centering but lower energy dissipation capacity in comparison to the benchmark shear wall. A novel scheme using Ultra-High-Performance Concrete (UHPC) was proposed and investigated using laboratory testing and finite element (FE) simulation to anchor external PT elements to existing foundation in the retrofitted shear walls. Four anchorage specimens, that were designed to anchor 2/5th of the maximum PT force expected in the retrofitted shear walls, were subjected to laboratory testing. 3D FE models were calibrated based on the measured response and were used to investigate the proposed anchorage scheme at full-scale. The current code provisions to limit residual drift and predict critical concrete strains in precast rocking shear walls were examined based on published results. The provisions on residual drift were found to be satisfactory for hybrid rocking walls. Two code-conforming rectangular hybrid rocking shear walls were tested in the laboratory to provide improve alternative for predicting plastic hinge length in rocking walls, which is critical in estimating critical concrete strain.Laboratory testing of precast rocking shear walls has been limited to rectangular cross section. This dissertation addresses the gap in literature by testing a T-shaped precast rocking shear wall. The test specimen was designed in accordance with current design guidelines, at one-third scale of a prototype wall and tested under multi-directional loading up to 1.50% drift. Test observations showed damage to be limited at the rocking corners. The measured residual drift was lower than 0.25% and the measured energy dissipation ratio exceeded the prescribed limit of 12.5%.
Author: Hamed Layssi
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
"This research describes an experimental and analytical investigation to evaluate the seismic performance of poorly designed and detailed reinforced concrete (RC) flexural shear walls both in their as-built conditions and after being retrofitted. Older shear walls have several deficiencies which make them vulnerable in case of moderate to severe earthquakes. Full-scale shear wall specimens were constructed and tested under reversed cyclic loading. Two different techniques were chosen to retrofit the deficient walls in order to improve the overall performance. A retrofit technique using Carbon Fibre Reinforced Polymer (CFRP), having minimum intervention, was studied to determine the seismic performance. A more labour-intensive repair technique, including the addition of a reinforced concrete jacket in the critical region (location of potential plastic hinging and lap splices of vertical bars) together with CFRP wrapping was also studied. The responses obtained from experiments were used to develop behavioural models, capable of representing the global responses of the walls, as well as critical failure modes observed in the experiments. These models provide useful tools for predicting the complete reversed cyclic loading responses of shear walls. The analytical models were used to predict the responses of a deficient prototype wall-frame structure in its original condition as well as after retrofit, subjected to different seismic hazard levels. This study enabled an evaluation of the performance of the prototype structure to determine the effectiveness of retrofit and repair measures." --
Author: Matthew Ireland
Publisher:
ISBN:
Category : Concrete walls
Languages : en
Pages : 328
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Book Description
Author: Stelios Antoniou
Publisher: John Wiley & Sons
ISBN: 1119987342
Category : Technology & Engineering
Languages : en
Pages : 549
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Book Description
Seismic Retrofit of Existing Reinforced Concrete Buildings Understand the complexities and challenges of retrofitting building infrastructure Across the world, buildings are gradually becoming structurally unsound. Many were constructed before seismic load capacity was a mandatory component of building standards, and were often built with low-quality materials or using unsafe construction practices. Many more are simply aging, with materials degrading, and steel corroding. As a result, efforts are ongoing to retrofit existing structures, and to develop new techniques for assessing and enhancing seismic load capacity in order to create a safer building infrastructure worldwide. Seismic Retrofit of Existing Reinforced Concrete Buildings provides a thorough book-length discussion of these techniques and their applications. Balancing theory and practice, the book provides engineers with a broad base of knowledge from which to approach real-world seismic assessments and retrofitting projects. It incorporates knowledge and experience frequently omitted from the building design process for a fuller account of this critical engineering subfield. Seismic Retrofit of Existing Reinforced Concrete Buildings readers will also find: Detailed treatment of each available strengthening technique, complete with advantages and disadvantages In-depth guidelines to select a specific technique for a given building type and/or engineering scenario Step-by-step guidance through the assessment/retrofitting process Seismic Retrofit of Existing Reinforced Concrete Buildings is an ideal reference for civil and structural engineering professionals and advanced students, particularly those working in seismically active areas.
Author: fib Fédération internationale du béton
Publisher: fib Fédération internationale du béton
ISBN: 9782883940642
Category : Technology & Engineering
Languages : en
Pages : 322
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Book Description
In most parts of the developed world, the building stock and the civil infrastructure are ageing and in constant need of maintenance, repair and upgrading. Moreover, in the light of our current knowledge and of modern codes, the majority of buildings stock and other types of structures in many parts of the world are substandard and deficient. This is especially so in earthquake-prone regions, as, even there, seismic design of structures is relatively recent. In those regions the major part of the seismic threat to human life and property comes from old buildings. Due to the infrastructure's increasing decay, frequently combined with the need for structural upgrading to meet more stringent design requirements (especially against seismic loads), structural retrofitting is becoming more and more important and receives today considerable emphasis throughout the world. In response to this need, a major part of the fib Model Code 2005, currently under development, is being devoted to structural conservation and maintenance. More importantly, in recognition of the importance of the seismic threat arising from existing substandard buildings, the first standards for structural upgrading to be promoted by the international engineering community and by regulatory authorities alike are for seismic rehabilitation of buildings. This is the case, for example, of Part 3: Strengthening and Repair of Buildings of Eurocode 8 (i. e. of the draft European Standard for earthquake-resistant design), and which is the only one among the current (2003) set of 58 Eurocodes attempting to address the problem of structural upgrading. It is also the case of the recent (2001) ASCE draft standard on Seismic evaluation of existing buildings and of the 1996 Law for promotion of seismic strengthening of existing reinforced concrete structures in Japan. As noted in Chapter 1 of this Bulletin, fib - as CEB and FIP did before - has placed considerable emphasis on assessment and rehabilitation of existing structures. The present Bulletin is a culmination of this effort in the special but very important field of seismic assessment and rehabilitation. It has been elaborated over a period of 4 years by Task Group 7.1 Assessment and retrofit of existing structures of fib Commission 7 Seismic design, a truly international team of experts, representing the expertise and experience of all the important seismic regions of the world. In the course of its work the team had six plenary two-day meetings: in January 1999 in Pavia, Italy; in August 1999 in Raleigh, North Carolina; in February 2000 in Queenstown, New Zealand; in July 2000 in Patras, Greece; in March 2001 in Lausanne, Switzerland; and in August 2001 in Seattle, Washington. In October 2002 the final draft of the Bulletin was presented to public during the 1st fib Congress in Osaka. It was also there that it was approved by fib Commission 7 Seismic Design. The contents is structured into main chapters as follows: 1 Introduction - 2 Performance objectives and system considerations - 3 Review of seismic assessment procedures - 4 Strength and deformation capacity of non-seismically detailed components - 5 Seismic retrofitting techniques - 6 Probabilistic concepts and methods - 7 Case studies
Author: Hossam El-Sokkary
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author:
Publisher:
ISBN:
Category : Juvenile Nonfiction
Languages : en
Pages : 74
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Book Description
This renamed version of the former Uniform code for building conservation guidelines for retrofitting unreinforced masonry bearing wall buildings, reinforced concrete and reinforced masonry buildings, wood frame residential buildings, and concrete with masonry infill buildings.
Author: James Paterson
Publisher:
ISBN:
Category :
Languages : en
Pages : 246
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Book Description
"The four shear wall specimens were tested under reversed cyclic loading. Two of these walls had a lap splice in the longitudinal steel at the base of the wall and the other two had a lap splice 600 mm from the base of the wall. One of each of these specimens was tested in the 'as-built' condition and the other two were retrofit prior to testing. The test results show that the retrofit strategies were successful in improving the ductility and energy dissipation of the shear walls." --
Author: Matthew Fox
Publisher: Emerald Group Publishing
ISBN: 1835498361
Category : Technology & Engineering
Languages : en
Pages : 314
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Book Description
Seismic Retrofit of Existing Buildings is a concise and easy-to-use guideline for practising engineers to assess and design successful seismic retrofit interventions for existing vulnerable buildings. It offers readers guidance on both conceptual design strategies and relevant detailed design considerations.
Author: Raja Rizwan Hussain
Publisher: Springer
ISBN: 9401772975
Category : Technology & Engineering
Languages : en
Pages : 129
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Book Description
This book details the analysis and design of high rise buildings for gravity and seismic analysis. It provides the knowledge structural engineers need to retrofit existing structures in order to meet safety requirements and better prevent potential damage from such disasters as earthquakes and fires. Coverage includes actual case studies of existing buildings, reviews of current knowledge for damages and their mitigation, protective design technologies, and analytical and computational techniques. This monograph also provides an experimental investigation on the properties of fiber reinforced concrete that consists of natural fibres like coconut coir and also steel fibres that are used for comparison in both Normal Strength Concrete (NSC) and High Strength Concrete (HSC). In addition, the authors examine the use of various repair techniques for damaged high rise buildings. The book will help upcoming structural design engineers learn the computer aided analysis and design of real existing high rise buildings by using ACI code for application of the gravity loads, UBC- 97 for seismic analysis and retrofitting analysis by computer models. It will be of immense use to the student community, academicians, consultants and practicing professional engineers and scientists involved in the planning, design, execution, inspection and supervision for the proper retrofitting of buildings.
