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 19 of 19 for “"dissipated energy"”.
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Dissipated Energy Concepts for HMA Performance: Fatigue and Healing
The uniqueness of the RDEC relationship allows it to be implemented into a pavement structural (thickness) design procedure. This procedure has the ability to utilize existing pavement response values with mixture properties to generate the PV-Nf relationship validated in this thesis. It also has …
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Verification of the dissipated energy based fatigue model using field data
… those obtained from Shen and Carpenter's Rate of Dissipated Energy Change (RDEC) model to estimate the theoretical Nf50 tensile strain. In addition, it was also observed that the variability of peak tensile strain values increased at pass corresponding to a 50% reduction in HMA modulus, confirming …
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Fatigue Damage Analysis in Asphalt Concrete Mixtures Based Upon Dissipated Energy Concepts
… a foundation for fatigue analysis based on dissipated energy concepts. Using the dissipated energy concepts in fatigue analysis make it possible to account for damage in a straightforward manner. The energy fatigue relation is easy, simple and based on a theory it is believed it win be the …
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Development of an Energy-based Liquefaction Evaluation Procedure
… The objective of this research is to develop an energy-based approach for evaluating the potential for liquefaction triggering. The current state-of-practice for the evaluation of liquefaction triggering is the "simplified" stressbased framework where resistance to liquefaction is correlated to …
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Laboratory investigation of fatigue endurance limits in asphalt concrete
… approach as well as a fundamental energy based approach, the dissipated energy concept. Results show that the dissipated energy approach estimates higher FEL values for both mix types than those estimated using the phenomenological approach. The FEL values for the SP-II and SP-III …
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Feasibility of passive electromagnetic dampers as energy harvesters in large structures
… has been a trend in structural design toward energy efficient design and motion based design. The strategy of motion based design is controlling the movement of structures to meet certain dynamic response requirements by damping the structure. Structural damping dissipates the energy of …
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Application of Fatigue Theories to Seismic Compression Estimation and the Evaluation of Liquefaction Potential
… procedure presented herein is based on dissipated energy and an SPT liquefaction/no-liquefaction case history database. It is as easy to implement as existing stress-based simplified procedures. Moreover, by using the dissipated energy of the entire loading time history to represent the …
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Energy-Based Evaluation and Remediation of Liquefiable Soils
… data in remedial ground densification design via energy-based concepts. The energy dissipated by frictional mechanisms during the relative movement of sand grains is hypothesized to be directly related to the ability of a soil to resist liquefaction (i.e., Capacity). This hypothesis is supported …
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Behavior of hollow-core fiber reinforced polymer-concrete-steel bridge columns under extreme loading
… reached a drift of 10.9%. The HC-FCS column dissipated energy reaching 1.9 times that of the RC column. A simple analytical model and preliminary design guidelines were presented to help implement this new technology. Vehicle collision with RC and HC-FCS bridge columns was also presented in …
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Energy Dissipation and Entropy Generation During the Fatigue Degradation: Application to Health Monitoring of Composites
… an experimental approach for characterizing energy dissipation and degradation evolution in a woven Epoxy/Glass (G10/FR4) laminate subjected to fully reversed bending fatigue test is presented. Infrared thermography and acoustic emission are utilized to characterize the degradation …
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Quantitative sustainability assessment of pavement-vehicle interaction : from bench-top experiments to integrated road network analysis
… to link infrastructure performance to lifecycle energy use and greenhouse gas (GHG) emissions. Beside surface texture and roughness-induced Pavement-Vehicle Interactions (PVI), we herein recognize that the dissipation of mechanical work provided by the vehicle due to viscous deformation within …
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Enhancement of crashworthiness in car-truck collisions using damped under-ride guard and composite crush elements
… freight vehicle and to design an improved crash energy management system to reduce the severity of collisions. A concept of an energy dissipating under-ride guard is analytically modeled and the performance potentials are investigated under direct and oblique impacts to enhance the …
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Characterization of Dynamic Structures Using Parametric and Non-parametric System Identification Methods
… damage could be quantified by measuring dissipated energy of each floor. The most severe damage in the superstructure was observed with the fixed foundation. Second, the responses of a full-scale suspension bridge in a ship-bridge collision accident were analyzed to characterize the …
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Design and microfabrication of multifunctional bio-inspired surfaces
… this measurement was used to evaluate the total dissipated energy of the sliding drop. Combining the data collected during this experiment with contact angle and contact angle hysteresis measurements we propose a global parameter that evaluates the superhydrophobic “level†of a surface. …
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Drained cyclic preshearing effects on the liquefaction resistance of sands
… were used to evaluate the effectiveness of the energy-based GMP model for predicting porewater pressure generation in presheared soils and to examine how the concept of dissipated energy can be applied to cyclic simple shear tests on presheared sands to characterize the combined effects that …
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Stochastic prediction of collapse of building structures under seismic excitations
… and reliable collapse risk assessment. Since energy parameters at system-level are aggregated quantities considering redistribution and variation of each individual component-damage within the structural system, they can be excellent indicators to represent total severe structural damage …
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Nonlinear finite element analysis of reinforced concrete structures subjected to blast loading
… as a function of the post-failure viscoplastic dissipated energy and strain rate until crushing occurs, according to proposed strain controlled crushing conditions. The viscoplastic strain rate is calculated by a rate dependent associated flow rule in which the fluidity parameter is derived as a …
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Evaluating Shear links for Use in Seismic Structural Fuses
… behavior including increased stiffness and energy dissipating ability. Both of these characteristics lead to reduced drifts during earthquakes, which in turn leads to a reduction of drift related structural and nonstructural damage. Shear links are being used for seismic energy dissipation …
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Enhanced dissipation for improved mechanical performance: a journey from concrete structures to functional materials [Miglioramento della dissipazione per prestazioni meccaniche ottimizzate: un percorso dalle strutture in calcestruzzo ai materiali funzionali]
La risposta meccanica dei materiali reali è spesso governata da meccanismi microscopici, come lo scorrimento di microfessure, il rilassamento viscoelastico, le instabilità di flusso multifase o gli effetti elettromeccanici accoppiati, assenti nei modelli continui classici. Questa tesi sviluppa …