Browsing by Subject "Concrete beams"

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    Camber analysis and design of continuous prestressed concrete beams
    (Texas Tech University, 1969-05) Horn, Howard Richard
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    Digital image processing for the study of concrete beam cracks
    (Texas Tech University, 1999-12) Sury, Anis Salaheddin
    This thesis presents the research that was carried out to attain these objectives. The second chapter provides an introduction and background information about digital images. It discusses the nature of digital images, the way in which they are stored in the computer, and some background information about color types and color manipulation. Chapter 3 discusses the image processing algorithms that were developed for the purpose of conducting concrete crack studies, and the way in which these algorithms were tested on the digital image of a concrete sidewalk crack. However, for use of the techniques for actual concrete beam cracks, small reinforced concrete beams were built and tested to crack in shear, digital pictures were taken of the cracks, and these images were processed using the developed computer algorithms. Chapter 4 presents the design of the small reinforced concrete beams and their test setup, and Chapter 5 discusses the results obtained from testing these beams. Chapter 6 is dedicated to conclusions and recommendations.
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    Rehabilitation of poorly detailed RC structures using CFRP materials
    (2006-05) Kim, InSung; Jirsa, J. O. (James Otis)
    In many reinforced concrete structures built in the 1970's and earlier, bottom beam reinforcement is not continuous and if a column support is lost due to terrorist attack or other unexpected action, the structure could be vulnerable to progressive collapse. The use of CFRP material may provide a solution for rehabilitating such structures. CFRP materials cannot develop full tensile capacity unless they are properly anchored to the reinforced concrete structure. The intent of this study is to find an effective method of anchoring CFRP material to a reinforced concrete beam so that the ultimate tensile strength of the CFRP is realized. In this study, ten reinforced concrete beams rehabilitated using different configurations of anchors were tested to assess the effectiveness of the anchors. Both CFRP anchors and CFRP U-wraps were investigated. The rehabilitated beams were loaded until failure of the CFRP material or anchor occurred. Different failure modes, strengths and deformation capacities of the rehabilitated beams were observed depending on the configurations of anchors. The maximum capacity was obtained using a combination of CFRP anchors and U-wraps.