Seismic Strengthening Of Unreinforced Masonry Buildings
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Seismic Strengthening Of Unreinforced Masonry Buildings With Steel Elements
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Author : Durgesh Chandra Rai
language : en
Publisher:
Release Date : 1996
Seismic Strengthening Of Unreinforced Masonry Buildings With Steel Elements written by Durgesh Chandra Rai and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Buildings categories.
Seismic Strengthening Of Unreinforced Masonry Buildings
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Author : Kit M. Wong
language : en
Publisher:
Release Date : 1987
Seismic Strengthening Of Unreinforced Masonry Buildings written by Kit M. Wong and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with Buildings categories.
Seismic Strengthening Of Unreinforced Masonry Buildings
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Author : Richard Beller
language : en
Publisher:
Release Date : 1994
Seismic Strengthening Of Unreinforced Masonry Buildings written by Richard Beller and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Buildings categories.
Seismic Strengthening Of Unreinforced Masonry Buildings Using Steel Bars And Tendons Embedded In Ferrocement Strips
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Author : William L. Nunan
language : en
Publisher:
Release Date : 1996
Seismic Strengthening Of Unreinforced Masonry Buildings Using Steel Bars And Tendons Embedded In Ferrocement Strips written by William L. Nunan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Buildings categories.
Earthquake Resistant Design Of Masonry Buildings
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Author : Miha Tomazevic
language : en
Publisher: World Scientific
Release Date : 1999-07-05
Earthquake Resistant Design Of Masonry Buildings written by Miha Tomazevic and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999-07-05 with Technology & Engineering categories.
In the last few decades, a considerable amount of experimental and analytical research on the seismic behaviour of masonry walls and buildings has been carried out. The investigations resulted in the development of methods for seismic analysis and design, as well as new technologies and construction systems. After many centuries of traditional use and decades of allowable stress design, clear concepts for limit state verification of masonry buildings under earthquake loading have recently been introduced in codes of practice.Although this book is not a review of the state-of-the-art of masonry structures in earthquake zones, an attempt has been made to balance the discussion on recent code requirements, state-of-the-art methods of earthquake-resistant design and the author's research work, in order to render the book useful for a broader application in design practice. An attempt has also been made to present, in a condensed but easy to understand way, all the information needed for earthquake-resistant design of masonry buildings constructed using traditional systems. The basic concepts of limit state verification are presented and equations for seismic resistance verification of masonry walls of all types of construction, (unreinforced, confined and reinforced) as well as masonry-infilled reinforced concrete frames, are addressed. A method for seismic resistance verification, compatible with recent code requirements, is also discussed. In all cases, experimental results are used to explain the proposed methods and equations.An important part of this book is dedicated to the discussion of the problems of repair, retrofit and rehabilitation of existing masonry buildings, including historical structures in urban centres. Methods of strengthening masonry walls as well as improving the structural integrity of existing buildings are described in detail. Wherever possible, experimental evidence regarding the effectiveness of the proposed strengthening methods is given.
Selected Strengthening Techniques For The Seismic Retrofit Of Unreinforced Masonry Buildings
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Author : Najif Ismail
language : en
Publisher:
Release Date : 2012
Selected Strengthening Techniques For The Seismic Retrofit Of Unreinforced Masonry Buildings written by Najif Ismail and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Historic buildings categories.
Approximately two thirds of the fatalities caused by earthquakes in the last one hundred years have resulted due to the collapse of unreinforced masonry (URM) buildings. Poor performance of URM buildings was also observed in recent earthquakes such as the 2005 Pakistan earthquake, the 2008 Sichuan earthquake, the 2009 L'Aquila earthquake and the 2010/2011 Canterbury (New Zealand) earthquake sequence. The New Zealand URM building stock consists of mostly pre-1931 structures, with many of these buildings contributing to the country's architectural heritage. It was revealed in a recent survey that many of New Zealand's URM buildings have insufficient capacity to endure even a moderate earthquake but the concerns of heritage preservation makes demolition of these historic URM buildings undesirable, which results in seismic retrofit being necessary. Many seismic retrofit solutions have already been implemented in New Zealand, but the experimental database on their seismic behaviour is scarce. Consequently, the research reported here was undertaken to investigate the performance of URM walls when seismically retrofitted using three strengthening techniques, which were selected after an extensive literature review. The selected strengthening techniques are (i) unbonded posttensioning using threaded steel rods and sheathed greased strands, (ii) near surface mounting of high strength twisted stainless steel bars (NSM-TS), and (iii) surface application of polymer textile reinforced mortar (TRM). The selected seismic strengthening techniques were adapted for New Zealand URM buildings, and the performance of URM walls seismically strengthened using the adapted strengthening techniques was investigated by performing numerous full scale laboratory based and field tests. Based on the results of the experimental program empirical design equations were derived and checked for accuracy by comparing with current design equations and with experimental results. Finally, case studies were conducted to demonstrate application of these strengthening techniques for the seismic retrofit of historic URM buildings.
The Shakeout Scenario Supplemental Study Unreinforced Masonry Urm Buildings
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Author :
language : en
Publisher: SPA Risk LLC
Release Date :
The Shakeout Scenario Supplemental Study Unreinforced Masonry Urm Buildings written by and has been published by SPA Risk LLC this book supported file pdf, txt, epub, kindle and other format this book has been release on with categories.
Effectiveness Of Unreinforced Masonry Seismic Retrofit Programmes
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Author : Qing Tong
language : en
Publisher:
Release Date : 2022
Effectiveness Of Unreinforced Masonry Seismic Retrofit Programmes written by Qing Tong and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with categories.
Implementing seismic risk mitigation programmes for earthquake-prone unreinforced masonry buildings (URM) is critical to ensure public safety and community resilience in regions of moderate and high seismicity. In New Zealand, it is a mandatory requirement to strengthen earthquake-prone buildings within a prescribed timeframe. However, the rate of compliance has been slow. Building owners delay or hesitate to undertake seismic strengthening, mainly due to uncertainties involved in cost (Egbelakin et al., 2014) [1]. While cost is the pivot of the owner's decision-making process, an effective design of government-led programmes is essential to engage the owners and increase the rate of compliance. This paper compared similar mandatory URM programmes in the United States and New Zealand to identify critical contributors to the success of each programme. In addition, this paper implements a regression analysis using actual remediation cost data gathered from a recent mandatory strengthening programme in New Zealand to identify significant cost factors in seismic strengthening. From the comparison, six key contributors to programme success were recognised, including 1) efficient and flexible financial options; 2) alternative retrofit design solutions; 3) fair penalties and enforcement tools; 4) a clearly laid out action plan and time limits for compliance; 5) dedicated local council staff and case managers; 6) consultation with building owners. The cost model suggested that building characteristics, location, and heritage status are significant in seismic strengthening costs. The findings contribute to the fine-tuning of future programme designs and the understanding of financial impediments building owners face in seismic strengthening. Significant cost factors identified in this study indicate where the allocation of government funding is required the most to maximise the incentivising of owners for early adoption of compliance measures.
Seismic Strengthening Of Low Rise Unreinforced Masonry Structures With Flexible Diaphragms
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Author : Franklin Lehr Moon
language : en
Publisher:
Release Date : 2003
Seismic Strengthening Of Low Rise Unreinforced Masonry Structures With Flexible Diaphragms written by Franklin Lehr Moon and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Composite materials categories.
As a capstone to several Mid-America Earthquake Center (MAE Center) projects, a full-scale two story unreinforced masonry (URM) building was tested following the application of several retrofit techniques, which included the use of fiber reinforced polymer (FRP) overlays, near surface mounted (NSM) rods, vertical unbonded post-tensioning, and joist anchors. The test structure was composed of four URM walls, flexible timber diaphragms and interior stud walls, and was designed and built following construction practices consistent with those used in Mid-America prior to 1950. Initial testing subjected both the roof diaphragm and in-plane walls to slowly applied lateral load reversals in an unreinforced sate. Following this series of tests, each in-plane wall was retrofit and retested. Experimental results indicated that global issues such as flange participation and the effects of overturning moment substantially impacted the response of primary components both before and after retrofit. FRP retrofit techniques resulted in strength increases up to 32% and displayed a pseudo-ductile response caused by progressive debonding. For cases where such retrofits forced sliding failures, large increases in energy dissipation resulted. The use of vertical unbonded post-tensioning resulted in strength increases between 40%-60%; however, piers displayed a tendency to switch from a ductile rocking/sliding mode to a more brittle diagonal tension mode. In addition, results highlighted the need for retrofit schemes to employ both horizontal and vertical reinforcement to prevent progressive crack opening that can decrease wall displacement capacity. Based on the experimental results, the model implied by the "Prestandard for the Rehabilitation of Existing Structures," FEMA 356, for the analysis of in-plane URM walls was modified and extended to (1) include the effect of FRP pier retrofits and (2) consider the global effects of URM structures. The resulting model displayed reasonable estimates of measured response both before and after retrofit, with an average error of 14%. In addition, the proposed model displayed improvements over the current model from 14% to 66%. Based on the results of sensitivity analyses this improved accuracy was primarily attributed to the consideration of global effects.
The Seismic Rehabilitation Of Historic Buildings
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Author : Antonio Aguilar (Architect)
language : en
Publisher: Government Printing Office
Release Date :
The Seismic Rehabilitation Of Historic Buildings written by Antonio Aguilar (Architect) and has been published by Government Printing Office this book supported file pdf, txt, epub, kindle and other format this book has been release on with categories.
This Preservation Brief provides information on how earthquakes affect historic buildings, how a historic preservation ethic can guide responsible retrofit decisions, and how various methods of seismic rehabilitation can protect human lives and historic structures. The Brief provides a description of the most common vulnerabilities of various building construction types and the seismic strengthening methods most often needed to remedy them. A glossary of technical terms is also provided at the end of the Brief. Undertaking the seismic rehabilitation of a historic building is a process that requires careful planning and execution, and the coordinated work of architects, engineers, code officials, contractors, and agency administrators. Project personnel working together can ensure that the architectural, structural, financial, programmatic, cultural, and social values of historic buildings are preserved, while rendering them safe for continued use.