Seismic Strengthening of Unreinforced Masonry Buildings Using Steel Bars and Tendons Embedded in Ferrocement Strips PDF Download
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Author: William L. Nunan
Publisher:
ISBN:
Category : Buildings
Languages : en
Pages : 120
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Book Description
Author: William L. Nunan
Publisher:
ISBN:
Category : Buildings
Languages : en
Pages : 120
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Book Description
Author: Mustafa Taghdi
Publisher:
ISBN:
Category :
Languages : en
Pages :
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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:
Publisher:
ISBN:
Category : Buildings
Languages : en
Pages : 146
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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: Durgesh Chandra Rai
Publisher:
ISBN:
Category : Buildings
Languages : en
Pages : 336
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Book Description
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: Yi-Wei Lin
Publisher:
ISBN:
Category : Brick walls
Languages : en
Pages : 279
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Book Description
This doctoral study investigated the use of Engineered Cementitious Composite (ECC) shotcrete, a sprayable fibre reinforced mortar that exhibits a strain-hardening characteristic, for the seismic strengthening of unreinforced masonry structures. Additionally, the feasibility of utilising ECC shotcrete as a chloride resistant cover concrete to improve the service life of reinforced concrete structures was examined. A series of laboratory tests quantified the ECC shotcrete tensile characteristic properties using a new technique, with the results adopted for the structural analysis and design of ECC strengthened walls. Subsequent laboratory testing defined the chloride diffusion coefficients of multiple ECC mix designs, indicating that increased fly ash content significantly improved the chloride resistance. Life cycle modelling showed that assuming an uncracked state throughout the structure service life, replacement of the investigated 40 MPa concrete with the best performing ECC shotcrete mix for steel reinforcement cover could provide a service life extension of up to 42 years. Testing of 25 clay brick wallettes subjected to in-plane loading showed that ECC application increased wall capacity by up to 5.1 times their as-built state. Masonry wall thickness and ECC overlay thickness were the key parameters affecting strengthened clay brick wall performance. Testing of 26 concrete block masonry wallettes determined the effect of ECC applicator skill and application method on wall performance, with strength reduction factors introduced to account for this effect. Using the experimental results, an in-plane masonry wall strengthening design procedure was proposed. Testing of five ECC strengthened clay brick masonry walls subjected to out-of-plane loading showed a 12.7 times strength increase when ECC overlay was applied to the wall tensile surface and a strength increase of 3.4 times when ECC overlay and near surface mounted steel reinforcement was applied to the wall compression surface. Strengthened wall capacity was predicted using existing concrete flexural design methodologies, and design procedures for out-of-plane strengthening of clay brick masonry walls were proposed. An ECC shotcrete based seismic strengthening design was developed for a 1917 two-storey in-service unreinforced masonry building utilising the material properties and design methodologies defined in this doctoral study. No significant application issues were identified during the implementation process, and the current results support the use of ECC as a seismic strengthening system for masonry buildings.
Author: Arya, Anand S
Publisher: UNESCO
ISBN: 9230000329
Category :
Languages : en
Pages : 191
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Book Description
Author: Thomas C. Jester
Publisher: Getty Publications
ISBN: 1606063251
Category : Architecture
Languages : en
Pages : 354
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Book Description
Over the concluding decades of the twentieth century, the historic preservation community increasingly turned its attention to modern buildings, including bungalows from the 1930s, gas stations and diners from the 1940s, and office buildings and architectural homes from the 1950s. Conservation efforts, however, were often hampered by a lack of technical information about the products used in these structures, and to fill this gap Twentieth-Century Building Materials was developed by the U.S. Department of the Interior’s National Park Service and first published in 1995. Now, this invaluable guide is being reissued—with a new preface by the book’s original editor. With more than 250 illustrations, including a full-color photographic essay, the volume remains an indispensable reference on the history and conservation of modern building materials. Thirty-seven essays written by leading experts offer insights into the history, manufacturing processes, and uses of a wide range of materials, including glass block, aluminum, plywood, linoleum, and gypsum board. Readers will also learn about how these materials perform over time and discover valuable conservation and repair techniques. Bibliographies and sources for further research complete the volume. The book is intended for a wide range of conservation professionals including architects, engineers, conservators, and material scientists engaged in the conservation of modern buildings, as well as scholars in related disciplines.
