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Fatigue And Fracture Of The Frp-Wood Interface: Experimental Characterization And Performance Limits, Yong Hong
Fatigue And Fracture Of The Frp-Wood Interface: Experimental Characterization And Performance Limits, Yong Hong
Electronic Theses and Dissertations
A performance-based material evaluation methodology was developed to qualify FRP composite reinforcement bonded to glulam structural members for highway bridge applications. The objectives of this thesis are: a) to implement and correlate two methods to evaluate the fatigue and fracture performance of FRP-wood interfaces with associated performance limits; and b) to provide data and recommendations necessary to develop performance-based material specifications. The first method is based on evaluating the apparent shear strength in a single-lap shear test by fatigue tension loading. The second method is based on evaluating the interface fracture toughness in Mode I or opening-mode using fracture mechanics. …
Effects Of Frost Heave On A Soil Nail Wall In Brunswick, Maine, Sandra Mcrae Duchesne
Effects Of Frost Heave On A Soil Nail Wall In Brunswick, Maine, Sandra Mcrae Duchesne
Electronic Theses and Dissertations
Soil nail walls have been used as retaining structures worldwide since the early 1970s. The technology is particularly well suited for constructing walls in areas with limited overhead clearance and maneuvering room for heavy equipment, such as highway bridge underpasses. However, designers have been reluctant to experiment with soil nailing in areas with cold-weather climates and frost-susceptible soils, due to the lack of quantifiable data on the behavior of these walls when subjected to freezing conditions. The University of Maine collaborated with the Maine Department of Transportation (MDOT) in a research initiative on the first soil nail wall project in …
Fatigue Behavior Of Frp-Reinforced Douglas-Fir Glued Laminated Bridge Girders, Matthew Ritchie
Fatigue Behavior Of Frp-Reinforced Douglas-Fir Glued Laminated Bridge Girders, Matthew Ritchie
Electronic Theses and Dissertations
The use of composites in engineered wood products has recently led to the use of fiber-reinforced polymers (FRP) as a reinforcing for glued-laminated (glulam) beams. Bridge girders are among the more common applications of FRP-reinforced glulam beams and therefore the beam is subject to millions of load cycles as well as moisture fluctuations. Significant flexural strength can be gained through the use of such reinforcing, however, the behavior of the wood composite when subject to repeated load cycles and hygrothemal effects is not well understood. In this study, eighteen glulam beams were reinforced in tension with 1.93% E- glass/epoxy reinforcing …
Voltammetric Study Of Interaction Of Copper And Model Fungal Secreted Ligands, Ran Liu
Voltammetric Study Of Interaction Of Copper And Model Fungal Secreted Ligands, Ran Liu
Electronic Theses and Dissertations
In lieu of Abstract, excerpt from Conclusion of Voltammetric Study of Interaction of Copper and Model Fungal Secreted Ligands: In summary, the cyclic voltammetry study shows evidence that the chelatormediated Fenton reaction is favored in the wood cell wall, where it may promote the degradation process. Also, reaction mechanisms between Cu(II), 2,3-DHBA and H202 have been proposed which provide at least partial explanations for the H202 cycle, and the mechanism for non-enzymatic, chelator-mediated Fenton reactions in brown rot wood decay processes. Future research in this area should explore cyclic voltarnrnetry analyses of Cu(I1) and ligands secreted by fungi, such as …