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Filtering by: Creator Higgins, C. W. Remove constraint Creator: Higgins, C. W. Degree Name Doctor of Philosophy (Ph.D.) Remove constraint Degree Name: Doctor of Philosophy (Ph.D.)

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  • Design, analysis and evaluation of bridge superstructures for live loads

    Creator:
    Turan, O. Tugrul
    Abstract:
    Due to age, original design that is deficient by modern standards, inadequate maintenance, environmental conditions, and increasing loads, large numbers of bridges in United States and elsewhere are classified as deficient and in need of rehabilitation or replacement. According to a national bridge inventory established by the Federal Highway Administration,...
    Resource Type:
    Dissertation
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    approved: ___________________________________________________________ Christopher C. Higgins

  • Primary productivity and community structure of an estuarine impoundment

    Creator:
    Lyford, John Higgins
    Abstract:
    An impounded estuary was employed to study primary productivity, community respiration, and community structure as they related to seasonal and temporal succession, salinity, and water temperature. Plankton metabolism was studied by means of the light-and dark-bottle technique. Benthic community metabolism was determined by using the "diurnal oxygen curve" method. Four...
    Resource Type:
    Dissertation
    Full Text:
    Estuarine Impoundment AN ABS TRACT OF THE THESIS OF John Higgins Lyford, Jr. for the Ph. D. in Botany

  • Experimental and Analytical Studies of Large-Scale Pile Caps

    Creator:
    Al-Sakin, Yasmeen
    Abstract:
    Pile caps are structural elements used to transfer loads from columns to a group of piles, which transfer them to stronger soil layers. Pile cap with horizontal distance between the column and piles less than twice its effective depth is categorized as "deep," where significant nonlinear strain distribution occurs through...
    Resource Type:
    Dissertation
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    : ______________________________________________________ Christopher C. Higgins Pile caps are structural elements used to transfer loads from

  • New acoustic emission applications in civil engineering

    Creator:
    Schumacher, Thomas
    Abstract:
    Non-destructive testing methods and applications have become of increasing interest due to the worldwide aging and deteriorating infrastructure network. In the field of Civil Engineering, bridges and bridge components as well as non-structural elements such as roadway pavements for example, are affected. In particular, the Acoustic Emission (AE) technique offers...
    Resource Type:
    Dissertation
    Full Text:
    C. Higgins Non-destructive testing methods and applications have become of increasing interest

  • Experimental and analytical evaluation of conventionally reinforced deck-girder bridge bent caps with vintage details

    Creator:
    Senturk, Ahmet Ekin
    Abstract:
    Many conventionally reinforced concrete deck girder (RCDG) bridges were built in the US during the 1950s, throughout the expansion of the Interstate System. Designs followed the AASHO standard of the time, which permitted higher shear stress in concrete and reduced detailing requirements than permitted by current specifications. Many of these...
    Resource Type:
    Dissertation
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    Deck-Girder Bridge Bent Caps with Vintage Details Abstract approved: Christopher C. Higgins

  • Shear repair methods for conventionally reinforced concrete girders and deep beams

    Creator:
    Howell, Daniel A.
    Abstract:
    Many conventionally reinforced concrete deck girder bridges (RCDG) and their intermediate supporting bent caps were designed during the Eisenhower interstate era of the 1950’s with the AASHO design equations at the time, which subsequently place higher demand on the concrete. The referenced components may exhibit diagonal cracking due to the...
    Resource Type:
    Dissertation
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    : _______________________________ Christopher C. Higgins Many conventionally reinforced concrete deck girder bridges (RCDG

  • Analysis of conventionally reinforced concrete deck girder bridges for shear

    Creator:
    Potisuk, Tanarat
    Abstract:
    Large numbers of 1950's vintage conventionally reinforced concrete (CRC) bridges remain in-service in the national bridge inventory. Many of these bridges are lightly reinforced for shear. Evaluation of these bridges to prevent unnecessary and costly repairs requires refined analytical techniques. This dissertation presents finite element (FE) modeling and comparisons of...
    Resource Type:
    Dissertation
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    for evaluation of these bridges to prevent unnecessary and costly repairs. U, C, I- 0 I.- w .0

  • The influence of solar panels on local hydrology and plant ecology

    Creator:
    Hassanpour, Elnaz
    Abstract:
    Photo voltaic solar energy is a clean source of energy with much lower carbon footprint than other sources. However, the vast land requirements of solar energy arrays may make installation impractical when available land is better suited for other purposes. The goal of this research was to investigate changes to...
    Resource Type:
    Poster
    Full Text:
    ) Neutron probe Elnaz Hassanpour,  Ziru Liu,  Chad  Higgins Department  of  Biological  and  Ecological

  • Leveraging the Food-Energy-Water Nexus for Planet Resilience

    Creator:
    Steadman, Casey L.
    Abstract:
    We have sufficient evidence that our historical management of natural resources is not sustainable. Food production is stagnating or declining. Nonrenewable energy sources on which the energy sector has historically depended are being rapidly depleted. Water resources, for which the energy and food sectors compete, are being depleted and impaired....
    Resource Type:
    Dissertation
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    Chad W. Higgins We have sufficient evidence that our historical management of natural resources

  • Irrigation Innovations to Increase Efficiency and Sustainability

    Creator:
    Al-agele, Hadi A.
    Abstract:
    The first part of the dissertation chronicles irrigation technology changes to progressively improve water application efficiency, water use efficiency, irrigation water productivity and crop production. Technological innovation in irrigation, from 6000 BC to present, has been driven by an unchanging need to provide support for growing populations. The first irrigation...
    Resource Type:
    Dissertation
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    approved: Chad W