Seismic Strengthening of Unreinforced Masonry Buildings PDF Download
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Author: Kit M. Wong
Publisher:
ISBN:
Category : Buildings
Languages : en
Pages : 132
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Book Description
Author: Kit M. Wong
Publisher:
ISBN:
Category : Buildings
Languages : en
Pages : 132
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Book Description
Author: Richard Beller
Publisher:
ISBN:
Category : Buildings
Languages : en
Pages : 226
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Book Description
Author: Durgesh Chandra Rai
Publisher:
ISBN:
Category : Buildings
Languages : en
Pages : 336
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Book Description
Author:
Publisher: SPA Risk LLC
ISBN:
Category :
Languages : en
Pages : 16
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Book Description
Author: Miha Tomazevic
Publisher: World Scientific
ISBN: 1783262524
Category : Technology & Engineering
Languages : en
Pages : 281
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Book Description
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.
Author: William L. Nunan
Publisher:
ISBN:
Category : Buildings
Languages : en
Pages : 120
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Book Description
Author: Qing Tong
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
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.
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: Franklin Lehr Moon
Publisher:
ISBN:
Category : Composite materials
Languages : en
Pages : 1298
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Book Description
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.
Author: Najif Ismail
Publisher:
ISBN:
Category : Historic buildings
Languages : en
Pages : 273
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Book Description
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.
