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Seismic Retrofitting Of Conventional Reinforced Concrete Moment Resisting Frames Using Buckling Restrained Braces
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Book Synopsis Seismic Retrofitting of Conventional Reinforced Concrete Moment-Resisting Frames Using Buckling Restrained Braces by : Zaid Al-Sadoon
Download or read book Seismic Retrofitting of Conventional Reinforced Concrete Moment-Resisting Frames Using Buckling Restrained Braces written by Zaid Al-Sadoon and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Retrofitting Framework for Pre-Northridge Steel Moment-frame Buildings by : Arnar Bjorn Bjornsson
Download or read book A Retrofitting Framework for Pre-Northridge Steel Moment-frame Buildings written by Arnar Bjorn Bjornsson and published by . This book was released on 2014 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the 1994 M[subscript w] 6.7 Northridge and 1995 M[subscript w] 6.9 Kobe earthquakes, steel moment-frame buildings were exposed to an unexpected flaw. The commonly utilized welded unreinforced flange, bolted web connections were observed to experience brittle fractures in a number of buildings, even at low levels of seismic demand. A majority of these buildings have not been retrofitted and may be susceptible to structural collapse in a major earthquake. This dissertation presents a case study of retrofitting a 20-story pre-Northridge steel moment-frame building. Twelve retrofit schemes are developed that present some range in degree of intervention. Three retrofitting techniques are considered: upgrading the brittle beam-to-column moment resisting connections, and implementing either conventional or buckling-restrained brace elements within the existing moment-frame bays. The retrofit schemes include some that are designed to the basic safety objective of ASCE-41 Seismic Rehabilitation of Existing Buildings. Detailed finite element models of the base line building and the retrofit schemes are constructed. The models include considerations of brittle beam-to-column moment resisting connection fractures, column splice fractures, column baseplate fractures, accidental contributions from "simple"' non-moment resisting beam-to-column connections to the lateral force-resisting system, and composite actions of beams with the overlying floor system. In addition, foundation interaction is included through nonlinear translational springs underneath basement columns. To investigate the effectiveness of the retrofit schemes, the building models are analyzed under ground motions from three large magnitude simulated earthquakes that cause intense shaking in the greater Los Angeles metropolitan area, and under recorded ground motions from actual earthquakes. It is found that retrofit schemes that convert the existing moment-frames into braced-frames by implementing either conventional or buckling-restrained braces are effective in limiting structural damage and mitigating structural collapse. In the three simulated earthquakes, a 20% chance of simulated collapse is realized at PGV of around 0.6 m/s for the base line model, but at PGV of around 1.8 m/s for some of the retrofit schemes. However, conventional braces are observed to deteriorate rapidly. Hence, if a braced-frame that employs conventional braces survives a large earthquake, it is questionable how much service the braces provide in potential aftershocks.
Book Synopsis Strengthening and Retrofitting of Existing Structures by :
Download or read book Strengthening and Retrofitting of Existing Structures written by and published by . This book was released on 2018-05 with total page 375 pages. Available in PDF, EPUB and Kindle. Book excerpt: Seismic retrofitting is the modification of existing structures to make them more resistant to seismic activity, ground motion, or soil failure due to earthquakes. The planning of changes to existing buildings differs from new planning through an important condition; the existing construction must be taken as the basis of all planning and building actions. The need for seismic retrofitting of an existing building can arise due to several reasons like: building not designed to code, subsequent updating of code and design practice, subsequent upgrading of seismic zone, deterioration of strength and aging, modification of existing structure, change in use of the building, etc. Seismic retrofit is primarily applied to achieve public safety, with various levels of structure and material survivability determined by economic considerations. In recent years, an increased urgency has been felt to strengthen the deficient buildings, as part of active disaster mitigation, and to work out the modifications that may be made to an existing structure to improve the structural performance during an earthquake. Seismic retrofitting schemes can be either global or local, based on how many members of the structures they are used for. Global Retrofit methods include conventional methods (increase seismic resistance of existing structures) or non-conventional methods (reduction of seismic demand). Strengthening and Retrofitting of Existing Structures is a compendium of cutting-edge trends of the research and existing practices in strengthening and retrofitting of structural elements, as well as the findings of a research endeavor initiated by the authors to investigate and develop a robust structural retrofitting scheme by utilizing elastomeric polymers to enhance the resistance of reinforced concrete (RC) structures. It addresses in detail specific techniques for the strengthening of traditional constructions, reinforced concrete buildings, bridges and their foundations. It also presents insight into the key issues relevant to seismic retrofit of concrete frame buildings. Many guidelines are reviewed regarding seismic rehabilitation of school, office, hospital and apartment buildings.
Book Synopsis Earthquake Resistant Engineering Structures X by : C.A. Brebbia
Download or read book Earthquake Resistant Engineering Structures X written by C.A. Brebbia and published by WIT Press. This book was released on 2015-09-15 with total page 345 pages. Available in PDF, EPUB and Kindle. Book excerpt: Containing the latest research on preparation for and mitigation of future earthquakes, this book addresses an area of increasing importance to many areas around the world. It contains research presented at the ninth and latest in a series of biennial conferences on the topic organised by the Wessex Institute. As world population has concentrated in urban areas, we have seen the consequences of natural disasters take an ever higher toll in human life and property. Adding to this trend, earthquake activity is being registered in areas that were not previously very active, thus the need for research into the application of technological advances to the specific area of earthquake engineering. This volume presents those advances. The papers cover Seismic Isolation and Energy Dissipation; Building Performance During Earthquakes; Nonlinear Numerical Analysis; Performance Based Design; Experimental Studies; Seismic Hazard Evaluation and Microzoning for Structural Design; Seismic Hazard Assessment; Case Studies.
Book Synopsis Earthquake Engineering by : Yousef Bozorgnia
Download or read book Earthquake Engineering written by Yousef Bozorgnia and published by CRC Press. This book was released on 2004-05-11 with total page 958 pages. Available in PDF, EPUB and Kindle. Book excerpt: This multi-contributor book provides comprehensive coverage of earthquake engineering problems, an overview of traditional methods, and the scientific background on recent developments. It discusses computer methods on structural analysis and provides access to the recent design methodologies and serves as a reference for both professionals and res
Book Synopsis Nonlinear Finite Element Modelling of Reinforced Concrete Frames Retrofitted with Shape Memory Alloy Buckling Restrained Braces by : Pedro Alexandre Guimaraes Rocha
Download or read book Nonlinear Finite Element Modelling of Reinforced Concrete Frames Retrofitted with Shape Memory Alloy Buckling Restrained Braces written by Pedro Alexandre Guimaraes Rocha and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reinforced concrete buildings built prior to the enactment of modern seismic provisions are vulnerable when subjected to high-magnitude earthquakes since they lack the capacity to properly dissipate the energy associated with the ground excitation. Therefore, this research aims to investigate the benefits of Buckling-Restrained Braces (BRBs) as a retrofit technique for accommodating seismic demands in seismically deficient reinforced concrete frames, the dominant structural system of pre-1970s construction. The efficiency of Superelastic-Shape Memory Alloys (SE-SMA) as the core material of the BRB is also evaluated. Improvements in lateral strength capacity and residual displacements of the SMA-BRB retrofitted frames are assessed against a previously tested bare concrete frame and frames retrofitted with BRBs incorporating stainless steel and chrome-molybdenum steel core bars. Reverse cyclic finite-element modelling of the frames was conducted with VecTor2, and the numerical models were validated through experimental results present in the literature. The validated numerical models were further modified to address deficiencies in the original BRB design by including improvements in restraining of the buckling. The SMA-BRB provided lateral strength comparable to the modified steel BRB models with enhancements in ductility capacity. Notably, the SMA-BRB system did not accumulate additional residual displacements beyond those experienced by the bare frame alone. Therefore, the reduction in residual displacements, in comparison to conventional steel core BRB materials, illustrates one of the main benefits of SMA bars, leading to a viable and efficient alternative to increase the seismic performance and reduce damage in structural elements located in high seismic zones. Furthermore, nonlinear time-history analyses are conducted. Earthquake records that simulate design earthquakes for the cities of Montreal and Vancouver were selected for the dynamic loading. At the end of the thesis, an optimized BRB design is provided in which the full capacity of the core bars is achieved since localized buckling is minimized.
Book Synopsis Guidelines for Seismic Retrofit of Existing Buildings by :
Download or read book Guidelines for Seismic Retrofit of Existing Buildings written by and published by . This book was released on 2001 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 :fib Fédération internationale du béton Publisher :fib Fédération internationale du béton ISBN 13 :9782883940642 Total Pages :322 pages Book Rating :4.9/5 (46 download)
Book Synopsis Seismic Assessment and Retrofit of Reinforced Concrete Buildings by : fib Fédération internationale du béton
Download or read book Seismic Assessment and Retrofit of Reinforced Concrete Buildings written by fib Fédération internationale du béton and published by fib Fédération internationale du béton. This book was released on 2003-08-01 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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
Book Synopsis Seismic Retrofit of Existing Reinforced Concrete Moment Resisting Frame Structures Using Diagonal Prestressing by : Jean-Michel Carrière
Download or read book Seismic Retrofit of Existing Reinforced Concrete Moment Resisting Frame Structures Using Diagonal Prestressing written by Jean-Michel Carrière and published by . This book was released on 2007 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis NEHRP Guidelines for the Seismic Rehabilitation of Buildings by :
Download or read book NEHRP Guidelines for the Seismic Rehabilitation of Buildings written by and published by . This book was released on 1997 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Seismic Retrofit of Existing Reinforced Concrete Moment Resisting Frame Structures Using Diagonal Prestressing by : Jean-Michel Carrière
Download or read book Seismic Retrofit of Existing Reinforced Concrete Moment Resisting Frame Structures Using Diagonal Prestressing written by Jean-Michel Carrière and published by . This book was released on 2007 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Passive and Active Structural Vibration Control in Civil Engineering by : T.T. Soong
Download or read book Passive and Active Structural Vibration Control in Civil Engineering written by T.T. Soong and published by Springer. This book was released on 2014-05-04 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt: Base isolation, passive energy dissipation and active control represent three innovative technologies for protection of structures under environmental loads. Increasingly, they are being applied to the design of new structures or to the retrofit of existing structures against wind, earthquakes and other external loads. This book, with contributions from leading researchers from Japan, Europe, and the United States, presents a balanced view of current research and world-wide development in this exciting and fast expanding field. Basic principles as well as practical design and implementational issues associated with the application of base isolation systems and passive and active control devices to civil engineering structures are carefully addressed. Examples of structural applications are presented and extensively discussed.
Book Synopsis Buckling Restrained Braces for the Seismic Strengthening of a Five-Storey Reinforced Concrete Frame Structure by : Robie Gourd
Download or read book Buckling Restrained Braces for the Seismic Strengthening of a Five-Storey Reinforced Concrete Frame Structure written by Robie Gourd and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings written by and published by . This book was released on 1995 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Seismic Retrofit of Existing Reinforced Concrete Buildings by : Stelios Antoniou
Download or read book Seismic Retrofit of Existing Reinforced Concrete Buildings written by Stelios Antoniou and published by John Wiley & Sons. This book was released on 2023-01-31 with total page 549 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Energy-Based Seismic Engineering by : Amadeo Benavent-Climent
Download or read book Energy-Based Seismic Engineering written by Amadeo Benavent-Climent and published by Springer Nature. This book was released on 2021-04-30 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume gathers the latest advances, innovations, and applications in the field of seismic engineering, as presented by leading researchers and engineers at the 1st International Workshop on Energy-Based Seismic Engineering (IWEBSE), held in Madrid, Spain, on May 24-26, 2021. The contributions cover a diverse range of topics, including energy-based EDPs, damage potential of ground motion, structural modeling in energy-based damage assessment of structures, energy dissipation demand on structural components, innovative structures with energy dissipation systems or seismic isolation, as well as seismic design and analysis. Selected by means of a rigorous peer-review process, they will spur novel research directions and foster future multidisciplinary collaborations.
Book Synopsis High-performance Braces for Seismic Design by : Tim S. Lim
Download or read book High-performance Braces for Seismic Design written by Tim S. Lim and published by . This book was released on 2013 with total page 83 pages. Available in PDF, EPUB and Kindle. Book excerpt: The fundamental challenge for the structural engineer in designing earthquake-resistant structures is to design buildings with both adequate ductility and sufficient stiffness. Traditional lateral force resisting systems such as the moment resisting frame and the concentrically braced frame are both conventional structural schemes that have been implemented for many years, but result in only mediocre performance levels. The lacking stiffness of a moment resisting frame as well as the limited ductility of a concentrically braced frame gave impetus for engineers to direct significant research efforts into the development of new lateral resisting systems that embody a more stable hysteretic behavior, adequate ductility, control of damage, and energy dissipating capacity. Fortunately, several recent developments have allowed engineers to move one step closer to designing more efficient earthquake-resistant structures. "High-performance braces," as this thesis calls them, are new and improved bracing systems that combine the economy and stiffness of a concentrically braced frame with the ductility and energy dissipating capacity of a moment resisting frame. This thesis analyzes and evaluates three different types of high-performance braces: (i) the buckling-restrained brace frame, (ii) the self-centering energy dissipating brace frame, and (iii) the hybrid brace frame, with regards to their structural performance and economy. The primary goal of the thesis is to provide useful insights into the current developments of high-performance braces for practicing engineers in the hope that such systems can be more widely adopted and utilized in the contemporary design of earthquake-resistant structures. Keywords: High-performance braces, earthquake-resistant structures, seismic design
