Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 27 for “"Bond Behavior"”.
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Bond Behavior of Fiber Reinforced Polymer Bars Under Hinged Beam Conditions
The research provided in this report examines the behavior of fiber reinforced polymer (FRP) reinforcing bars, embedded in normal weight concrete (NWC) hinged beam-end specimens, tested in accordance with two laboratory conditions. Reinforcing bars of different diameter, material configuration, and …
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BOND BEHAVIOR BETWEEN STEEL AND HIGH MODULUS CFRP PLATES AT MODERATLEY ELEVATED TEMPERATURES
… elevated temperatures, up to 50oC, on the bond behavior of steel beams strengthened with externally bonded carbon fiber reinforced polymer (CFRP) plates. In the first phase of the research, five steel-CFRP bonded double-lap shear coupons were tested at different temperatures to characterize …
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Characterization of polyethylene terephthalate, cellulose acetate and their blends
… interactions play pertinent roles in adhesive bond performance and polymer-polymer miscibility. In this study, the correlation between the surface characteristics of two polymers and their adhesive bond behavior as well as the compatibility of their blend systems are investigated through both …
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Transfer and Development Lengths of Steel Strands in Full-Scale Prestressed Self-Consolidating Concrete Bridge Girders
… projects, though concern about early-age bond behavior has limited the material’s application in prestressed members. A keen understanding of SCC’s bond strength, including its impact on transfer and development lengths in prestressed members, is essential to safely implement SCC in …
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Rigidity and Fluidity in Living and Nonliving Matter
… of the two beads describe the catch/slip bond behavior of the integrins in focal adhesions. Net motion arises from an interplay between active contractility (and passive extendability) of the stress fibers and an asymmetry between the front and back of the cell due to catch bond behavior …
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Time-dependent response of flat plate structures under high sustained load
… In order to isolate and study aged concrete behavior under high sustained load, ASTM C512 (2010) compressive tests on plain concrete cylinders were conducted under sustained load levels ranging from 68 percent to 76 percent of the compressive strength of concrete. Concrete subjected to a …
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Predictive Modelling of CFRP-Steel Double Strap Joints
… hand, failure is more likely to happen at the bond interface due to the high strength characteristics of steel and CFRP. Thus, studying the bond behavior and failure mechanism of CFRP strengthened steel structures as well as the variables that are crucial to the bond quality. Prior to …
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Mechanisms and mechanics of non-structural adhesion
… into the mechanisms of adhesion and debonding energy associated with the cling between polymeric films and various substrates is presented first. The thermodynamic work of adhesion, electrostatic attraction, and substrate roughness apparently play significant roles in the cling of a …
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Theoretical and computational modeling of peptide-lipid bilayer interaction studied by dynamic force spectroscopy
… method also predicts that k(F) exhibits catch-bond behavior (when, counter intuitively, the detachment rate decreases with increasing force). (2) The proposed multiple detachment pathways method is tested and validated for a particular peptide (SecA2-11) interacting with both zwitterionic POPC …
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Reliability Analysis of Carbon Fiber Reinforced Polymer (CFRP) Strengthened Steel Beams
… dissertation was conducted to investigate the behavior of bonded joints between steel and carbon fiber reinforced polymers (CFRP) with an emphasis on understanding the role of the adhesive mechanical properties and the surface preparation techniques used to produce the joints. Reliability …
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Effects of aging on bond between FRP and concrete
… material of choice.;This research deals with the bond behavior of FRP composite wraps adhered/bonded to concrete surface. Focus of the study is on the bond degradation when the hybrid structure is exposed to different adverse environmental conditions including sustained stress. The study involves …
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An integrated VE damping and FRP strengthening system for performance-based seismic retrofit of RC columns
… were characterized under various conditions, the bond behavior between VE layers and FRP sheets as well as the anchorage behavior between FRP sheets and concrete were investigated, and shake table tests were conducted to validate the effectiveness of the proposed system. Test results show that VE …
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Development of a model to explain the effect of variable membrane compliance on single molecule adhesive bond force
The intermolecular bond force existing between adhesive membrane receptors and extracellular matrix (ECM) molecules is believed to regulate key cell functions, such as growth, apoptosis, motility, and mechanotransduction. From a clinical perspective, understanding the mechanics of cell-matrix bonds …
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Glass Fiber Reinforced Polymer Bars as the Top Mat Reinforcement for Bridge Decks
… was to experimentally investigate material and bond properties of three different types of fiber reinforced polymer (FRP) bars, and determine their effect on the design of a bridge deck using FRP bars as the top mat of reinforcement. The properties evaluated include the tensile strength, modulus …
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Durability behavior of fiber reinforced polymer and steel reinforced polymer for infrastructure applications
… necessary to study the long-term properties and behaviors of concrete members reinforced with composite materials.</p><p>This study includes three topics: 1. Long-term durability of concrete panels reinforced with steel and glass reinforced polymer (GFRP). The main objective of this study is to …
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Strengthening of reinforced masonry walls subjected to out-of-plane pseudo-static cyclic load using advanced composite
… to URM. This research aimed to investigate the behavior of reinforced masonry walls strengthened with advanced composite and subjected to out-of-plane pseudo-static cyclic load. Experimental and analytical studies were conducted to evaluate the performance of different techniques such as near …
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Experimental investigation of bridge deck with textured epoxy-coated rebars subjected to thermal loading
… of cracks. To mitigate both the reduction of bonding and the formation of cracks, the Illinois Department of Transportation (IDOT) developed a new type of coated bars, called textured epoxy-coated (TEC) bars. Over the last few years, different projects have been executed to understand and …
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Effects of Surface Condition and Environmental Exposure on the Bond between CFRP and Steel
… on steel strengthening have focused on the bond behavior of CFRP to steels having a smooth surface condition, which are not representative of deteriorated structures in greater need of retrofitting. Further research has examined the durability of CFRP-steel bonds relative to environmental …
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Carbon Fiber Reinforced Polymer Retrofits to Increase the Flexural Capacity of Deteriorated Steel Members
… 29,000 ksi], unanswered questions related to debonding, and no unified design or installation guides). However, newly developed materials and manufacturing processes have allowed for the economic development of stiffer CFRP materials suitable for steel structures, such as the high modulus (HM) …
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A Quantifiable Model for Local Bond Stress-Slip Relationship under Generalized Excitations
An analytical model for local bond stress-slip relationship proposed in this paper was developed because of the need for a reliable bond stress-slip model to be used in predicting the bond behavior between steel bars and concrete in the well-confined zones of concrete structures under generalized …
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