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 29 for “"load effects"”.
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A Method for the Combination of Stochastic Time Varying Load Effects
… the combined action of a number of time varying load processes is studied. Loads arrive at points in a Poisson process and are modeled by deterministic shapes for static effects and by continuous random processes for dynamic effects.
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Mechanical and electromagnetic transverse load effects on superconducting niobium-tin performance
… electromagnetic force and very large transverse loads are applied against the strands. This large force results in a degradation of the performance of the superconducting magnets. In this thesis work transverse load experiments on sub-sized cables, have been designed to study the mechanical and …
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Evaluation of rootstock and crop load effects on the performance of `Gibson Golden Delicious' and three scab-resistant apple cultivars
… as selection of good quality rootstocks and crop load management for high quality fruit and consistent apple production across growing seasons. The primary objective of this investigation was to evaluate the effect of rootstocks and cropping densities on fruit quality attributes and return bloom …
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New Truck Loading Model For Rural Bridges In Saskatchewan
… existing information on estimating the critical load effects occurring on short span bridges, on low traffic roadways, and over specific reference periods makes it difficult to perform the bridge evaluations with an adequate degree of confidence. This study focuses on aspects of the estimation of …
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Analysis and comparison of the South African and Eurocode live load models for railway bridges
… Transport Services (SATS) and Eurocode (EC) live load models for railway bridges. The study is specifically concerned with the critical load effects of shear and bending moment. The load models are simulated as moving loads over the full length of simply supported and continuous railway systems …
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Reliability based live loads for structural assessment of bridges on heavy-haul railway lines
The highest live loads on railway lines are on dedicated freight corridors operated as heavy-haul lines. These lines carry high axle loads above 25 tonnes and total tonnage above 20 million tonnes per annum over distances greater than 150km. The South African iron ore line currently operates long …
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The Influence of the Recommended LRFD Guidelines for the Seismic Design of Highway Bridges on Virginia Bridges
… the bridge was modeled in RISA 3D. Live and dead load were imposed on the bridge to calculate the cracked section properties of the bridge. The period of vibration of the bridge was also calculated. After the soil class of the bridge was determined, the design response spectrum curve of the bridge …
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Review of South African live load models for traffic loading on bridge and culvert structures using weigh-in-motion (WIM) data
… weigh-in-motion (WIM) sensors to calculate the load effects on single lane, simply supported structures spanning up to 30m. The main objective was to compare the load effects caused by the recorded vehicles with those calculated using TMH7 Part 2 and the alternative live load models proposed in …
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Shear Reliability Analysis of Reinforced Concrete Bridges Designed to TMH7
… bridges in South Africa. Its normal traffic load model (NA loading), based on the outdated BS5400 design code and 1972 traffic loads, has not been updated to account for the changes in traffic demands. Thereby, the validity of TMH7 in simulating the current traffic demands is in question. …
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Investigation of Methods for Structural System Reliability
… ways in which a structure can carry an applied load. For a class of structures, in which the load effects on the surviving elements never decrease with the failures of other elements, simplified formulations are introduced. Such simplifications for this type of structure result from the fact …
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Object oriented programming for reinforced concrete T-beam bridge design
… influence line coordinates for various load effects in the deck and beam subjected to moving loads. The analysis results using the program were compared with those obtained from the commercial programs. The design results obtained from the program were compared with example problems for …
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High Voltage Synchronous Rectifier Design Considerations
… rectifier: (1) high voltage sensing; (2) light load effects; (3) accuracy. The first hurdle to designing a high voltage SR system is the high voltage itself. Traditional methods of synchronous rectification (SR) attempt to directly sense voltage or current, which is not possible with high …
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The Role of the Posterior Parietal Cortex in Subjective and Objective Episodic Memory Recollection
… to remembering only font or color. Memory load effects for retrieval of information from long-term memory were only seen in the hippocampus on the Subjective retrieval task. These patterns of activity support the role of the VPC in recollection, as seen on the Subjective task, and the role …
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APPLICATION OF MULTI-HAZARD SEISMIC-BLAST DETAILING FOR HIGHWAY BRIDGES
… bridge in New York. Seismic-detailing for blast loading on bridges has been investigated to study the correlations between seismic design for blast load effects. High-precision 3D Finite Element models of bridges detailed for blast-resistant applications have been developed by designing the …
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The Application and interpretation of linear finite element analysis results in the design and detailing of hogging moment regions in reinforced concrete flat plates
… especially in areas of the structures where peak load effects (singularities) are experienced. In this thesis these peak areas are investigated, in an effort to provide insight into the actual behaviour of the structure as opposed to the theoretical results obtained from a FE analysis. The …
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Using Incremental Dynamic Analysis to Visualize the Effects of Viscous Fluid Dampers on Steel Moment Frame Drift
… of these moment frames when subjected to seismic load effects. Models of three story and nine story steel moment frames were designed to meet typical strength requirements for office buildings in Seattle, Washington. These models were intentionally designed to violate seismic interstory drift …
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A Feasiblity Study on the Fatigue Performance of Laser Beam Welds and Hybrid-Laser Arc Welds Used in an Innovative Modular Steel Sandwich Panel Bridge Deck SyStem
… service life in excess of 100 plus years, dead load reduction, rapid construction, decreased closure time, and automated mass production. The lack of fatigue data for the laser "stake" welds used to create the enclosed sandwich panel geometry raised concerns with respect to fatigue life. The …
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Field monitoring of integral abutment bridge approach slabs
… Static truck testing was conducted to study the effects of live load on the approach slabs. Although live load effects were distinctly observed, the thermal strain change even during daily cycles is more substantial compared to live load induced strains. Finite element analyses of the IAB …
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Co-Design of Resource Limited Genetic Networks Tuning System Parameters to Satisfy Specifications
… in modularity in biological systems, such as load effects (retroactivity), unknown interactions and resource competition, which is our focus for this work. Recent efforts to achieve modular design in systems with resource competition, have focused in adding additional machinery to the cell to …
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Probabilistic Assessment of Non-Ductile Reinforced Concrete Frames Susceptible to Mid-America Ground Motions
… which have primarily been designed for gravity load effects, is expected to be deficient when subjected to earthquakes that are judged, in recent seismological research, as being plausible in the New Madrid Seismic Zone (NMSZ). The objective of this study is to develop a set of probability-based …
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