Browsing by Subject "Department of Civil Engineering"

Now showing 1 - 20 of 31
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    Analysis of Post-Installed Glass Fiber-Reinforced Polymer Anchorage in Beam-Column Joints
    (2017) McDermott, Matthew; Dymond, Ben
    This project sought to examine the performance of glass fiber-reinforced polymer (GFRP) bars in post-installed anchorage of beam-column joints. Post-installing is a common and often preferable method of making structural concrete connections in buildings and other structures as the system offers much flexibility. Some applications include cantilever beams, slab widening, and diaphragm wall construction. Post-installing requires little installation time, can be installed in many orientations, and is serviceable shortly after installation (Hilti, 2011). The method involves drilling a hole in a hardened concrete member and anchoring a bar of some type into the hole. Most commonly, an adjacent member is cast around the post-installed bar. In other cases, fixtures are attached to the post-installed bar such as hand rails or window framing systems. Regardless of the application, the connection of the bar to the adjoining concrete in a drilled hole is the critical link for post-installed connections.
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    An Anthropologic Investigation of Methods to Reduce the Weight of Concrete Structures
    (2020-04) Clement, Timothy J
    A brief anthropologic investigation of methods to reduce the weight of concrete structures
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    Assessing the Merit of F14T Super High Strength Structural Bolts
    (2010-04-21) Petersen-Gauthier, Joel
    Steel buildings and bridge structures across the United States currently utilize two main types of high strength structural bolts to transfer the forces developed in the connections between structural members. These bolts are designated by the American Society for Testing and Materials (ASTM) as A325 and A490, which can hold up to 120ksi and 150ksi respectively. Several countries across the globe have recently introduced new grades of high strength bolts to cope with increasing material strength and to enhance design options. The recently developed Japanese Industrial Standard (JIS) F14T bolt has an ultimate tensile strength of roughly 200ksi, 33% stronger than the A490, the strongest ASTM bolt. Although the F14T is considerably stronger than the A490, that does not necessarily mean the connection will be stronger. There are many ways a connection can fail besides bolt failure. The type of failure depends on many factors such as what kind of connection it is, what types of loads are being applied to the connection, and the material properties of all connection members. To determine the potential benefit of the F14T over the A325 and A490, all connection limit states must be investigated and calculated using the different bolts. Also, before this is done the standards and practices of each standardizing company (ASTM and JIS) must be researched to determine if the bolts can be directly compared or if some values must be changed for a fair representation of their differences.
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    The Civil Scoop (2010-12)
    (University of Minnesota Duluth, 2010-12) University of Minnesota Duluth. Department of Civil Engineering
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    The Civil Scoop (2011-05)
    (University of Minnesota Duluth, 2011-05) University of Minnesota Duluth. Department of Civil Engineering
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    The Civil Scoop (2012-05)
    (University of Minnesota Duluth, 2012-05) University of Minnesota Duluth. Department of Civil Engineering
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    The Civil Scoop (2013-10)
    (University of Minnesota Duluth, 2013-10) University of Minnesota Duluth. Department of Civil Engineering
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    The Civil Scoop (2014 Fall)
    (University of Minnesota Duluth, 2014) University of Minnesota Duluth. Department of Civil Engineering
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    The Civil Scoop (2014-04)
    (University of Minnesota Duluth, 2014-04) University of Minnesota Duluth. Department of Civil Engineering
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    The Civil Scoop (2015 Spring)
    (University of Minnesota Duluth, 2015) University of Minnesota Duluth. Department of Civil Engineering
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    The Civil Scoop (2015-2016)
    (University of Minnesota Duluth, 2016) University of Minnesota Duluth. Department of Civil Engineering
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    Computational Framework for Pavement Sensitivity Analysis Using the Mechanistic Empirical Pavement Design Procedure
    (2009-10-02) Gaynor, Andrew T.
    In civil engineering, the performance of a structure or project is the main objective. When designing a particular project it is important to explore an array of design options to determine which will perform best. This approach applies well to road design. Roads have many different characteristics that can be varied, from the thickness of different layers to the AADTT (average annual daily truck traffic). For this project a sensitivity analysis was performed to determine how particular output criteria would respond to variation in particular input variables. This analysis is done exclusively using computer modeling by the use of an array of programs.
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    Damage Detection by Acoustic Emission
    (2012-04-18) Ge, Chunwei
    Acoustic emission (AE) is microseismic signal generated by microcracks in brittle material such as concrete or rock. AE signals carry information about the source, including location and magnitude. Therefore, it is useful tool in evaluating deterioration of a structure. The growth of damage and potential failure can be identified by monitoring AE. It was observed that AE rate increased during the peak. Besides, detailed analysis showed that the locations of AE events coincide with the location of damage. The experimental results also showed damaged material had higher AE rate than “healthy” material.
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    Development of Low CO2 Concrete for UMD Sidewalks
    (2020-05) McCann, Amanda M
    In an effort to further the research and development of geopolymer cement, this UROP investigated the curing requirements of a variety of concrete mixtures with the goal of eventual placement of sidewalks on the University of Minnesota Duluth (UMD) campus. This project is the next step in the Sustainable Sidewalk project which has been going since 2015. These new and previously made mixtures have a lower carbon footprint than traditional portland cement concrete and have been shown to have enhanced durability. Ideally, we had hoped to find a mixture that allowed for the concrete, which normally requires heat to cure, to be cured ambiently, or in room temperature conditions.
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    Effectiveness of the UMD Parking Lot Stormwater Detention Ponds to Mitigate Runoff Effects to Tischer Creek
    (2018-11) Whiteside, Karth;
    The effectiveness of stormwater management features on decreasing the thermal pollution effects on protected trout streams in Minnesota.
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    Effects of Subgrade-Compaction Moisture Content on Performance of Asphalt Roads in Minnesota
    (2020-04) Henderson, Matthew W
    To identify ways to better design and construct asphalt pavement roads in Minnesota, this study examines the effects of excess moisture in the subgrade layer of road cross-sections in Minnesota through modelling. The subgrade layer of a road is the bottommost layer and consists of the existing soil. This layer's importance is sometimes neglected since it is farthest from the driving surface and is not imported as a construction material. However, it is the layer of a pavement cross-section that is most susceptible to a reduction in strength due to excess moisture. Using pavement modelling software, the effects of an increase in subgrade moisture and consequently a decrease in relative compaction on pavement design life were tested. A set of six road cross-sections were designed to exemplify the broad categories of asphalt paved roads seen in Minnesota. In each of these test cross-sections, a small increase in subgrade moisture content yielded an increase in the damage ratio and a decrease in the design life of the road. These results indicate that the moisture content in the subgrade layers of roads is influential in the driving surface performance. Additionally, achieving proper moisture levels in the subgrade during construction and maintaining the proper level of moisture over the life of a road is crucial to achieving that road's design life.
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    EnergyPlus Energy Simulation Software
    (2014) Gerber, Michael
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    Engineering Geopolymer Soil Material Using Fine Dredged Material (FDM) and Alkali-Activated Fly Ash Cement (AAFA)
    (2020-12) Ndayambaje, Regis
    Hydraulic conductivity is a vital input parameter when designing foundations, embankments, retaining walls, or roadways. Much research has been done on methods of improving hydraulic conductivity through soil improvement techniques available today. This work investigates an engineered solution to the waste materials piling up in a disposal facility in northern Minnesota. A sample of fine dredged material (FDM) from the Erie Pier facility in Duluth, MN, was classified as sand lean clay (CL) with a hydraulic conductivity of 6.06 x 10-6 cm/s. To increase the hydraulic conductivity, Class C fly ash, an industrial by-product from the local power plant in Duluth, MN, was activated with a combination of alkaline activator solutions, sodium hydroxide (NaOH) and sodium silicate (Na2SiO3), to generate alkali-activated fly ash cement (AAFA). The AAFA cement caused FDM soil particles to flocculate, which led to an increase in particle diameters. This new product, engineered geopolymer soil (EGS), was classified as poorly graded sand (SP) with a hydraulic conductivity at least two orders of magnitude higher than that of the original FDM. This technique improved the hydraulic conductivity of fine-dredged material and could contribute to the efforts of increasing reuse of waste by-products for engineered fill applications.
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    Evaluating and Monitoring BMPs with Networked Wireless Sensors
    (2011-04-13) Winterhalter, Maia
    Minnehaha Creek and the Mississippi River, like most other bodies of water, have contaminants flowing in them during all times of the year. These contaminants impact the environment differently depending on their nature; some are less harmful than others even though they might have a higher concentration in the water. Turbidity and high chloride concentrations are two indicators that a body of water is impaired, either for human use or ecologically. Best Management Practices, or BMPs, can help diminish these contaminants in many ways, such as settling small particles (turbidity) out of the water. I have been analyzing data collected from in-situ wireless sensors, comparing data upstream from various BMPs to downstream, and also analyzing the data to determine if water quality standards are violated. Stormwater outfalls into the Mississippi were monitored and compared with standards as well, in order to observe if these outfalls increased the concentrations of pollutants, particularly chloride or the turbidity, in the river over time. By determining the BMP performance, water quality around the metro can be monitored more accurately and the quality of its surface water will be secure into the future.