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Dissertations / Theses on the topic 'Structures strengthening'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Karlsson, Marlene. "CFRP strengthening of existing building structures." Thesis, Linköpings universitet, Institutionen för teknik och naturvetenskap, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-96306.

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Most of the building structures needed in twenty years from now is already built. Building structures are ageing and they deteriorate and often the demands on the structure changes over time. It is often needed to reinforce the structure, especially when reconstructing, repairing or renovating a building. The traditional strengthening methods that are used today are strengthening the structure with beams and columns of steel. The beams and columns often require much space and problems might occur if there are a lot of installations. There is another more modern technique where a composite plat

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2

Carolin, Anders. "Strengthening of concrete structures with CFRP : shear strengthening and full scale applications." Licentiate thesis, Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-17937.

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Structures can be in need of strengtheing due to many reasons, which are presented in this thesis. A literature review gives the existing methods for enhancing a structures load bearing capacity. In this thesis focus will be set at external bonding with carbon fibre reinforced polymers. A theory for shear strengthing is presented and compared to laboratory test. Full-scale applications with measurements are evaluated and presented. Finally, some topics for further research are given.<br><p>Godkänd; 2001; 20070316 (ysko)</p>

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3

André, Alann. "Strengthening of timber structures with flax fibres /." Luleå : Luleå University of Technology, 2007. http://epubl.ltu.se/1402-1757/2007/61/.

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4

Nikoukar, Zanjani Farzad. "Strengthening of metallic structures using carbon fibre composite plates." Thesis, University of Southampton, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.404028.

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5

Rahimi, Hamid. "Strengthening of concrete structures with externally bonded fibre-reinforced plastics." Thesis, Oxford Brookes University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245639.

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6

Khan, Rashid Ahmed. "Investigating the strengthening of steel structures subject to fatigue loading." Thesis, Heriot-Watt University, 2010. http://hdl.handle.net/10399/2402.

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7

Moon, Franklin L. (Franklin Lehr). "Seismic Strengthening of Low-Rise Unreinforced Masonry Structures with Flexible Diaphragms." Diss., Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/5128.

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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 subj

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8

Blanksvärd, Thomas. "Strengthening of concrete structures by the use of mineral based composites /." Luleå : Luleå University of Technology, 2007. http://epubl.ltu.se/1402-1757/2007/15/.

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9

Elghazy, Mohammed. "FRCM composites for strengthening corrosion-damaged structures : experimental and numerical investigations." Doctoral thesis, Université Laval, 2018. http://hdl.handle.net/20.500.11794/29567.

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La corrosion des armatures en acier est l'un des mécanismes les plus destructifs pour les structures en béton armé. La corrosion nuit non seulement à l'intégrité structurale et à l’aptitude au service de la structure endommagée, mais peut aussi entraîner des défaillances inattendues ou des ruptures fragiles. Malgré les dispositions rigoureuses de la plupart des codes de pratique pour éviter la corrosion, des signes de dommages dus à la corrosion sont toujours signalés. Récemment, des systèmes à matrice cimentaire renforcée de fibre (MCRF) ont été proposés comme une technique innovante de renfo

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10

Blanksvärd, Thomas. "Strengthening of concrete structures by the use of mineral based composites." Licentiate thesis, Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-17024.

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Strengthening of concrete structures with epoxy bonded carbon fiber reinforced polymers (CFRP) has been proved to be an excellent strengthening technique. However, using epoxy adhesives for bonding do contain some disadvantages such as diffusion closeness, thermal incompatibility to the base concrete, regulations regarding the working environment and minimum application temperature. Some of these drawbacks can be lessened by substituting the epoxy to a polymer reinforced mortar as the bonding agent. A new acronym for strengthening concrete structures with CFRP and polymer reinforced mortars is

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11

Ahmad, Syed Iftikhar. "Flexural and shear strengthening of concrete structures with prestressed GFRP sheets." Thesis, University of Ottawa (Canada), 2006. http://hdl.handle.net/10393/29336.

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Although Carbon Fibre Reinforced Polymer (CFRP) composite sheets have showed excellent results in laboratory for strengthening reinforced concrete structures, it could not get wide popularity in field application cost. To address this problem the present study was carried out to explore the possibility of using Glass FRP (GFRP) composite sheets which is relatively cheap material. GFRP has relatively low modulus of elasticity and therefore disregarded for strengthening in the past. Active strengthening technique i.e. prestressing was used for maximum utilization of GFRP strength. Prestressing h

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12

Tann, David Bohua. "Retrofitting of mechanically degraded concrete structures using fibre reinforced polymer composites." Thesis, University of South Wales, 2001. https://pure.southwales.ac.uk/en/studentthesis/retrofitting-of-mechanically-degraded-concrete-structures-using-fibre-reinforced-polymer-composites(efce1110-34e1-457d-8ec5-3ef5da026018).html.

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This research involves the study of the short term loaded behaviour of mechanically degraded reinforced concrete (RC) flexural elements, which are strengthened with fibre reinforced polymer (FRP) composites. The two main objectives have been: (a) to conduct a series of realistic tests, the results of which would be used to establish the design criteria, and (b) to carry out analytical modelling and hence develop a set of suitable design equations. It is expected that this work will contribute towards the establishment of definitive design guidelines for the strengthening of reinforced concrete

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13

Sweidan, Raed I. (Raed Ibrahim). "The application of fiber reinforced plastics to the strengthening of masonry structures." Thesis, Massachusetts Institute of Technology, 1992. http://hdl.handle.net/1721.1/13120.

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14

Islam, S. M. Zahurul. "Strengthening of aluminium and stainless steel tubular sections with fibre-reinforced polymer." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2012. http://hub.hku.hk/bib/B47752865.

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Strengthening of aluminium and stainless steel structural tubular sections using adhesive bonded fibre-reinforced polymer (FRP) subjected to web crippling has been investigated. Aluminium and stainless steel tubular sections may experience web crippling failure due to local concentrated loads or reactions. The web crippling strength can be enhanced by strengthening the webs of the sections in localized regions. The current international specifications of aluminium and stainless steel structures do not provide web crippling design rules for strengthening of tubular sections. Therefore,

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15

Haber, Zachary. "ON THE USE OF POLYURETHANE MATRIX CARBON FIBER COMPOSITES FOR STRENGTHENING CONCRETE STRUCTURES." Master's thesis, University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4105.

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Fiber-reinforced polymer (FRP) composite materials have effectively been used in numerous reinforced concrete civil infrastructure strengthening projects. Although a significant body of knowledge has been established for epoxy matrix carbon FRPs and epoxy adhesives, there is still a need to investigate other matrices and adhesive types. One such matrix/adhesive type yet to be heavily researched for infrastructure application is polyurethane. This thesis investigates use of polyurethane matrix carbon fiber composites for strengthening reinforced concrete civil infrastructure. Investigations on

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Napoli, Annalisa. "RC Structures Strengthened with Mechanically Fastened FRP Systems." Scholarly Repository, 2009. http://scholarlyrepository.miami.edu/oa_theses/184.

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Recently, the use of Mechanically Fastened Fiber-Reinforced Polymer (MF-FRP) systems has emerged as a viable means for flexural strengthening of reinforced concrete members. The technique is suitable for emergency repairs where constructability and speed of installation are critical requirements. The MF-FRP system consists of pre-cured FRP laminates with enhanced longitudinal bearing strength that are attached to the concrete substrate by means of mechanical steel anchors. This research project presents an experimental investigation comprising a series of flexural tests on scaled one-way RC sl

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17

Schnerch, David. "Strengthening of Steel Structures with High Modulus Carbon Fiber Reinforced Polymer (CFRP) Materials." NCSU, 2005. http://www.lib.ncsu.edu/theses/available/etd-06152005-090112/.

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Transportation departments and the telecommunications industry are currently demanding cost-effective rehabilitation and/or strengthening techniques for steel structures, including bridges and monopole towers. Rehabilitation is often required due to cross-section losses resulting from corrosion damage and strengthening may be required due to changes in the use of a structure. Current strengthening techniques, have several disadvantages including their cost, need to match the surface configuration of the existing structure, poor fatigue performance and the need for ongoing maintenance due to co

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18

Isaac, Philip. "Effects of extreme impulsive loads on RC structures with a view to strengthening." Thesis, University of Bath, 2014. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.642035.

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Accurately predicting the response of reinforced concrete columns to blast and impact loads is essential if structures are to be designed with sufficient robustness. The failure of load bearing columns can have devastating and costly consequences for the inhabitants of the building as history has shown. Current methods of analysis in this field tend to be either over simplified or too reliant on numerical modelling. It is shown from the literature review that significant gaps exist in our understanding of the complicated response of a member to these types of loads. Presented in this thesis is

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19

Paschalis, Spyridon A. "Strengthening of existing reinforced concrete structures using ultra high performance fiber reinforced concrete." Thesis, University of Brighton, 2017. https://research.brighton.ac.uk/en/studentTheses/c07ce9c7-5880-4108-a0f2-68bf6ea50dd5.

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Most of the new Reinforced Concrete (RC) structures which are built nowadays have a high safety level. Nevertheless, we cannot claim the same for structures built in the past. Many of these were designed without any regulations, or are based on those which have proved to be inadequate. Additionally, it seems that many old structures have reached the end of their service life and, in many cases, were designed to carry loads significantly lower than the current needs specify. Therefore, the structural evaluation and intervention are considered necessary, so they can meet the same requirements as

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20

Tao, Yi. "Fibre reinforced polymer (FRP) strengthened masonry arch structures." Thesis, University of Edinburgh, 2013. http://hdl.handle.net/1842/7743.

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Masonry arch bridges have played a significant role in the road and rail transportation network in the world for centuries. They are exposed to damage due to overloading and deterioration caused by environmental actions. In order to reestablish their performance and to prevent their collapse in various hazardous conditions, many of them require strengthening. Fibre reinforced polymer (FRP) systems are increasingly used for repair and strengthening of structures, with particularly widespread application to concrete structures. However, the application of FRP composites to masonry structures is

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21

Baran, Mehmet. "Precast Concrete Panel Reinforced Infill Walls For Seismic Strengthening Of Reinforced Concrete Framed Structures." Phd thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/3/12606137/index.pdf.

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The importance of seismic rehabilitation became evident with 1992 Erzincan Earthquake, after which a large number of reinforced concrete buildings damaged in recent earthquakes required strengthening as well as repair. In the studies related to rehabilitation, it has been realized that inadequate lateral stiffness is one of the major causes of damage in reinforced concrete buildings. Recently, economical, structurally effective and practically applicable seismic retrofitting techniques are being developed in METU Structural Mechanics Laboratory to overcome these kinds of problems. The strengt

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22

Atadero, Rebecca Anne. "Development of load and resistance factor design for FRP strengthening of reinforced concrete structures." Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2006. http://wwwlib.umi.com/cr/ucsd/fullcit?p3210643.

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Thesis (Ph. D.)--University of California, San Diego, 2006.<br>Title from first page of PDF file (viewed June 7, 2006). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 385-392).

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23

Loccarini, Federica Verfasser], and Harald [Akademischer Betreuer] [Kloft. "Behaviour of rammed earth structures : Sustainable materials and strengthening techniques / Federica Loccarini ; Betreuer: Harald Kloft." Braunschweig : Technische Universität Braunschweig, 2018. http://d-nb.info/1175815772/34.

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24

Ferreira, Denise Carina Santos. "A model for the nonlinear, time-dependent and strengthening analysis of shear critical frame concrete structures." Doctoral thesis, Universitat Politècnica de Catalunya, 2013. http://hdl.handle.net/10803/116540.

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Nonlinear fibre beam models, due to its intrinsic simplicity and computational efficiency, are often an adequate alternative to the complex nonlinear plane and solid FE models for the assessment of entire frame structures. Nevertheless, simulations of structural concrete members undergoing relevant shear stresses cannot be performed by these models, as nonlinear shear effects and shear-bending interaction are neglected. In turn, the presence of shear stresses in cracked reinforced concrete (RC) elements leads to a rather complex resistant mechanism which numerical modelling is neither straight

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25

Janda, Miloslav. "Zesilování stavebních konstrukcí." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2012. http://www.nusl.cz/ntk/nusl-225470.

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The subject of the diplom thesis is strengthening of building structures. The thesis is focused on strengthening of reinforced concrete compression of rod structures with concrete cover. The thesis consists of three parts. The first one is theoretical treatise on strengthening not only concrete compression of rod structures. The second part describes creating computer program of calculating concrete rod element rectangular overview which is made stronger with concrete cover using method of limit transformation. The third part consists of the static calculation strengthening of the concrete col

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26

Stanford, Kirk Alan. "STRENGTHENING OF STEEL STRUCTURES WITH HIGH MODULUS CARBON FIBER REINFORCED POLYMERS (CFRP) MATERIALS: BOND AND DEVELOPMENT LENGTH STUDY." NCSU, 2009. http://www.lib.ncsu.edu/theses/available/etd-12202008-112409/.

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Cost-effective solutions for the rehabilitation and strengthening of steel structures, such as steel bridges and steel monopole towers used for cellular phone antennas, are greatly needed by government transportation departments and industry. Rehabilitation is often required due to loss of cross-section from corrosion and/or changes of the demand or use of a structure. Current techniques for strengthening steel structures have several drawbacks including requiring heavy equipment for installation, their fatigue performance, in addition to the need for ongoing maintenance due to continued corro

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27

Al-Majidi, Mohammed Kadhim Haloob. "Development of Fibre Reinforced Geopolymer Concrete (FRGC) cured under ambient temperature for strengthening and repair of existing structures." Thesis, University of Brighton, 2017. https://research.brighton.ac.uk/en/studentTheses/13f703df-e33a-42d7-ad73-8511390fd582.

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Most of the previous research on plain and fibre reinforced geopolymer concrete (FRGC) has concerned on the properties of geopolymer mixtures hardened under heat curing conditions, which is a severe limitation for on-site, cast-in-place applications. This study focuses on the material and structural properties of novel fibre reinforced geopolymer concretes cured under ambient temperature. The overall aim of the study was to develop and test a more environmentally sustainable concrete material with improved structural characteristics, which utilises waste rather than primary mineral products, s

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28

Shad, Shirin. "The choice of Interventions for strengthening of historical adobe structures and remains in Bam Citadel "Arg-e Bam"." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-186504.

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Bam Citadel is a unique complex with some mediocre buildings in it. Construction started in the Achaemenid period (550–330 BC) and is still being completed and repaired up to the 21st century. Although the Bam region is located in south-western Iran in an active seismic zone, the City of Bam had not reported any major historical earthquake before 26th Dec. 2003. The massive earthquake that day killed or injured more than 37,000 people and most of the city collapsed. Bam Citadel became a unique adobe complex for the World Heritage community after this disaster. According to the surveys, the e

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Blanksvärd, Thomas. "Strengthening of concrete structures by the use of mineral based composites : system and design models for flexure and shear." Doctoral thesis, Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-26504.

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A great number of society's resources are invested in existing concrete structures, such as bridges, tunnels, different kind of buildings etc. All of these structures have both an expected function and an expected life span. However, both the function and the life span can be influenced by external factors, e.g. degradation and altered load situations. Further influencing aspects could be mistakes in design or during the construction phase. Repairing and/or strengthening these structures could maintain or increase the function as well as the life span.To strengthen concrete structures by using

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30

Othman, Daryan Jalal. "The influence of adhesive curing temperature upon the performance of FRP strengthened steel structures at ambient and elevated temperatures." Thesis, University of Edinburgh, 2017. http://hdl.handle.net/1842/29646.

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The structural adhesives widely used in structural strengthening applications are thermoset ambient cure adhesive polymers. At ambient temperatures, these polymers are in a relatively hard and inflexible state. At higher temperatures, the material becomes soft and flexible. The region where the molecular mobility changes dramatically is known as the glass transition temperature Tg and often is presented as a single value. Epoxy polymers exhibit a significant reduction in mechanical properties near glass transition temperature Tg when they are exposed to elevated temperatures. Glass transition

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31

Shad, Shirin [Verfasser], Wolfram [Akademischer Betreuer] Jäger, and Thomas [Akademischer Betreuer] Will. "The choice of Interventions for strengthening of historical adobe structures and remains in Bam Citadel "Arg-e Bam" / Shirin Shad. Betreuer: Wolfram Jäger. Gutachter: Thomas Will." Dresden : Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://d-nb.info/1078839964/34.

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32

Sener, Ipek Nese. "An Innovative Methodology And Structural Analysis For Relocation Of Historical Masonry Monuments: A Case Study In Hasankeyf." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12605025/index.pdf.

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Historical monuments are the most invaluable reflections of our architectural heritage and cultural identity, both of which have significant roles to create a strong link between the past and the present. They should be conserved in their own settings with their original characteristics or with as minimum changes as possible. However, natural or man-made hazards cause a serious risk for the survival of historical monuments. While some of them require to be strengthened only, some should be relocated to a new site since there are no means to save them without transporting. In this study, an i

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33

Hallonet, Anne. "Développement et caractérisation d'un matériau composite à base de fibres de lin : application au renforcement de structures en béton par collage externe." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSE1111/document.

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Afin de prolonger leur durée de vie et d'assurer la sécurité des usagers, les structures en béton peuvent nécessiter un renforcement au cours de leur durée de service. La technique de renforcement par collage externe, en surface, de composites renforcés de fibres de carbone, de verre ou d'aramide à l'aide de résines durcissant à température ambiante est largement employée pour son efficacité et sa facilité de mise oeuvre. Toutefois l'utilisation à la fois de fibres synthétiques et de matrices polymères produit un impact écologique non négligeable. L'objectif de ce travail de recherche est d'ex

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34

Vepřek, Karel. "Experimentální a numerická analýza zesílení ŽB prvku na ohyb." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2015. http://www.nusl.cz/ntk/nusl-227294.

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Design and manufacture of test elements for experimental testing laboratory. Testing of selected mechanical characteristics of test elements. Experimental analysis of test elements in the lab, creating a mathematical model in ATENA software and static calculation. Evaluation of experimental analysis and comparison with the values of numerical analysis. Graphic comparing the results of a final overall evaluation.

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35

Fonseca, Tatiana de Cássia Coutinho Silva da. "Reforço e incremento da rigidez à flexão de ligações viga-pilar de estruturas de concreto pré-moldado com polímero reforçado com fibra de carbono (PRFC)." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/18/18134/tde-19022008-132740/.

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Este trabalho apresenta o desenvolvimento de uma técnica de incremento da resistência e da rigidez à flexão de ligações de elementos de concreto pré-moldado, com aplicação de laminados de polímero reforçado com fibra de carbono (PRFC). O procedimento adotado consiste na colagem dos laminados de PRFC em entalhes no concreto de cobrimento, de acordo com a técnica conhecida como \"near-surface mounted\" (NSM), de modo a incorporar à ligação novos elementos resistentes à tração. Para solidarizar a ligação e possibilitar a transferência de esforços de compressão entre os elementos de concreto exist

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36

Canaval, Júnior Henrique. "Estudo experimental do comportamento de vigas de concreto armado reforçadas à flexão por meio de graute, armaduras e conectores / Júnior Henrique Canaval." Universidade Federal de Uberlândia, 2016. https://repositorio.ufu.br/handle/123456789/17853.

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Universidade Federal de Uberlândia<br>Este trabalho é relativo a uma investigação experimental sobre reforço à flexão de vigas de concreto armado e a influência de um tipo de conector. O programa experimental foi constituído de 8 conjuntos de blocos de concreto e de 15 vigas. Os blocos para ensaios de cisalhamento direto com seção transversal de 15 cm x 15 cm, sendo 4 conjuntos sem conectores e 4 com conectores. As vigas para ensaio à flexão possuíam seções transversais de 12 cm x 22 cm e comprimento de 200 cm, distribuídas em três séries de ensaio, cada uma envolvendo cinco vigas: 5 vigas uti

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Folvarčná, Ingrid. "Experimentální a numerická analýza zesílení ŽB prvku na smykové účinky." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2016. http://www.nusl.cz/ntk/nusl-240247.

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Design and manufacture of test elements for experimental laboratory testing of shear damage. Testing of selected mechanical characteristics of test elements. Experimental analysis of test elements in the lab, creating a mathematical model in ATENA software, static analysis. Evaluation of experimental analysis and comparison with the values of static analysis. Final overall evaluation.

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38

Carolin, Anders. "Carbon fibre reinforced polymers for strengthening of structural elements." Doctoral thesis, Luleå, 2003. http://epubl.luth.se/1402-1544/2003/018.

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39

FILHO, MARCELLO VARELLA SOUTO. "NUMERICAL MODELING OF STRUCTURAL STRENGTHENING OF REINFORCED CONCRETE BEAMS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2002. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=3328@1.

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CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO<br>A necessidade cada vez mais freqüente de reforço em estruturas de concreto armado, exige um completo conhecimento do comportamento da estrutura reforçada devido a alterações de rigidez do conjunto, aumento da carga de ruptura, alterações na distribuição de fissuras, modificação de comportamento e posição da linha neutra, entre outros. Nos últimos anos diversos estudos experimentais têm sido conduzidos, fornecendo parâmetros cada vez mais confiáveis à elaboração de projetos e ao dimensionamento seguro em relação aos estados

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Hubený, Radim. "Rekonstrukce zděné budovy." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2017. http://www.nusl.cz/ntk/nusl-265687.

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The final thesis is focused on restoration masonry building. Concretely assessment of resistance joist's floors, design alternative's strengthening and impact of surcharge on pronounces constructions. The choice one of alternatives strengthening, design and check of floor structure over the second floor.

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Rupert, Timothy J. (Timothy John). "Nanocrystalline alloys : enhanced strengthening mechanisms and mechanically-driven structural evolution." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/69793.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2011.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 127-132).<br>Nanocrystalline materials have experienced a great deal of attention in recent years, largely due to their impressive array of physical properties. In particular, nanocrystalline mechanical behavior has been of interest, as incredible strengths are predicted when grain size is reduced to the nanometer range. The vast majority of research to this point has focused on quantifying and understandin

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Abdel-Jaber, Ma'en. "Shear strengthening of reinforced concrete beams using externally bonded carbon fibre reinforced plates." Thesis, Oxford Brookes University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.341653.

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Anya, Chinasa Chukwuemeka. "The strengthening and "softening" of low-carbon structural steels by silicon." Thesis, University of Strathclyde, 1989. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=21217.

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The variation of tensile properties and grain sizes, on adding silicon, up to 1.03 wt% in five grades of low carbon structural steel was studied. The reduced sensitivity of the lower yield stress, [σy], at sub-zero test temperatures, otherwise called "softening", of these steels with reduced grain sizes, brought about by the silicon additions was also investigated. Optical and transmission electron microscopes were used to characterize the ferrite-pearlite structures, decarburized layers, random interlamellar spacings in the pearlite constituent, slip line, twin and dislocation structures. The

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Kansara, Kunal. "Assessment of conservativeness in design of FRP-based structural strengthening systems." Thesis, University of Bath, 2014. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.619237.

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Conservativeness (or conservatism), in general, is a measure of the lack of confidence in any activity that we do in the spheres of life. It is a reflection of our apprehension for the consequences of failure, and hence we instinctively tend to be conservative in order to be safe. Engineering design involves incorporation of various physical characteristics of the materials and systems through various mathematical models and design criteria. These models and criteria are developed based on empirically observed, experimentally measured, logically anticipated, analytically testified and/or hybri

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Lisztwan, Dominik. "Experimentální zkoušky vyztužených a zesílených betonových deskových prvků." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2021. http://www.nusl.cz/ntk/nusl-433475.

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This diploma thesis analyses behaviour of reinforced concrete slabs and their strengthened variants. Their comparison is determined by the results from the experimental load test. Outcomes are accompanied by the results gained from the analytical calculation according to valid codes and requirements and also nonlinear finite element method analysis.

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Fonseca, Tatiana de Cássia Coutinho Silva da. "Reforço de ligações viga-pilar de estruturas de concreto pré-moldado pela colagem de laminados de polímero reforçado com fibra de carbono (PRFC) em entalhes no concreto de cobrimento." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/18/18134/tde-20052013-091511/.

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Buscou-se por meio desta pesquisa avaliar a eficiência do reforço de ligações viga-pilar em estruturas de concreto pré-moldado. A técnica de reforço utilizada consiste na colagem de laminados de Polímero Reforçado com Fibra de Carbono (PRFC) em entalhes no concreto de cobrimento. Trata-se de uma técnica desenvolvida há cerca de dez anos, que apresentou, em pesquisas, desempenho superior às alternativas de colagem externa de mantas e laminados no tocante a reforço à flexão. Nenhuma referência ao uso desta ou de qualquer outra técnica para o reforço de ligações viga-pilar de estruturas pré-molda

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Agar, Mehmet. "Strengthening Of Reinforced Concrete Frames By Using Steel Bracings." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609664/index.pdf.

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Structures in high seismic risk areas may be susceptible to severe damage in a major earthquake. Structures designed to meet older code requirements may be at even greater risk. When these structures are evaluated with respect to current code criteria, it is observed that they lack of lateral strength and/or ductility. Since safety and economic considerations are major problems, these structures become viable candidates for retrofit and seismic strengthening. For the variety of structures and possible deficiencies that arise, several retrofitting techniques can be considered. Diagonal bracing

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Rafeeq, Ranj. "Torsional Strengthening of Reinforced Concrete Beams Using CFRP Composites." PDXScholar, 2016. http://pdxscholar.library.pdx.edu/open_access_etds/3125.

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Few decades ago, there were no guidelines for torsion design of reinforced concrete (RC) beams. Hence, many existing beams in older buildings have a lack of adequate torsional strength since they were not properly designed for torsion. One way to regain/rehabilitate adequate torsional strength is through application of externally bonded carbon fiber reinforced polymers (CFRP). To date, American Concrete Institute (ACI) code, as well as other building codes, do not have recommendations or provisions for strengthening RC beams for torsion using fiber-reinforced polymer (FRP) composites due to th

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Kayatin, Matthew Jay Davis Virginia A. "Rheology, structure, and stability of carbon nanotube-unstaturated polyester resin dispersions." Auburn, Ala, 2008. http://hdl.handle.net/10415/1421.

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Rocha, Daphne Wojciechowski. "Flexural strengthening by means of a arc overlay in the tension zone." Master's thesis, Faculdade de Ciências e Tecnologia, 2012. http://hdl.handle.net/10362/8850.

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Dissertação para obtenção do Grau de Mestre em Engenharia Civil – Perfil de Estruturas<br>Reinforced concrete structures may be flexurally strengthened in the tension zone by the addition of a new concrete layer with embedded steel reinforcement. However, the interface between the new and old concrete creates a weak area that may cause failure to occur for loads inferior to the designed. Therefore the success of this technique relies on the interface capacity to transmit stress. Surface treatments and cleanliness are the two main aspects that affect adhesion between different age concret

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