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 10 of 10 for “"Creep deformations"”.
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Study of the aging hereditariness of concrete through a novel viscoelastic formulation
This thesis focuses on the study of the creep deformations exhibited by concrete structures, with a particular attention to long-span prestressed box girders. During their service life, such structures can experience excessive multidecade deflections mainly due to the creep phenomenon and the large …
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Micromechanical modeling of concrete at early age
… materials. In light of this approach, effective creep properties of composite spherical assemblage with an aging matrix are obtained. In addition, the elastic Hashin-Monteiro model is generalized to account for the effect of the interfacial transition zone properties on concrete creep. An …
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Finite Element Analysis of a Shaft-Rotor System
… conducted by Fingers provided the material and creep properties used in the analysis presented in this report. The finite element method was used to analyze a spinning rotor mounted to a circular shaft via an interference fit subjected to various operating environments. The power law creep model …
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Validation of New Asphalt Cement Specification Test Methods Using Eastern and Northeastern Ontario Contracts and Trial Sections
… allowing the separation of elastic and viscous creep deformations. The regular specification parameters, stiffness (S) and relaxation ability (m-value) and also other performance-related properties were determined. It was found that the confounding effect of simultaneous elastic and viscous …
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Mechanics and subcritical cracking of FRP-concrete interface
… simulate the interface stress redistribution and creep deformations accumulated during service life due to the strong time dependent features of the adhesive layer, linear viscoelastic analytical solutions are then developed for the FRP-strengthened RC beams. Small cracks usually exist within the …
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Transient moisture effects on the viscoelasticity of synthetic fibers and composites
… is to study the mechano-sorptive effects on the creep behavior of synthetic fibers and composite materials. This study consisted of two main parts: 1). a phenomenological investigation of the transient moisture effects in synthetic fibers and composite materials and 2). mechanistic studies of the …
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Effect of Confinement and Temperature on the Behavior of EPS Geofoam
… the modulus significantly.</p> <p>A series of creep tests were performed on different densities of EPS geofoam with and without confining pressures. The results showed confining pressures can significantly affect the creep responses of EPS geofoam. Effects of confining pressures on creep …
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Microstructural evolution and mechanical behavior in nickel based alloys for very high temperature reactor
… time-dependent (plasticity) to time-independent (creep) deformations. At temperatures from 300 to 700ºC, the yield strength was found to be temperature independent as a result of additional strain hardening provided by dynamic strain aging. However, higher temperatures (>800ºC) activated …
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Estudio sobre la aplicabilidad de los modelos de cálculo de la fluencia y retracción al hormigón autocompactable
… its hardened state, including the shrinkage and creep deformations. It is of general acceptance that concrete with a higher paste volume undergoes larger creep and shrinkage deformations. One of the main objectives of this study is to create an extensive database of SCC and CC shrinkage and creep …
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Dosificación, propiedades y durabilidad en hormigón autocompactante para edificación
… types of concretes, the long term shrinkage and creep deformations are also examined. The second objective of this thesis is to study the applicability of special cements, which are characterised by their high addition content. The characteristics of the concretes which incorporate these special …