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 17 of 17 for “"Skew angle"”.
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Brace Effectiveness of Cross-frame Layout and Connection Design on Skewed Steel Bridges During Construction
… is to align cross-frames parallel to the skew angle to avoid problems associated with fit-up during erection. The American Association of State Highway and Transportation Officials (AASHTO) provisions for bridges with skew angle greater than 20 degrees are based on the assumption that …
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A plane grillage model for structural dynamics experiments: design, theoretical analysis, and experimental testing
… flexible plane grillage, with an adjustable skew angle, free to rotate on knife edges. The plane grillage model was shown, by theory and experiment, to have high modal density at low frequencies (twelve modes below 11 Hz). It was also demonstrated, by analogy with published results for a …
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Evaluation Of Nozzle Geometry On High Pressure Gasoline Direct Injection Spray Atomization
… ratio, counter-bore presence and nozzle-hole skew-angle geometry, are studied in detail in order to provide insight into their specific influence on spray plume targeting and jet primary breakup characteristics. A comparison of the simulation results with near-field shadowgraph and Mie scatter …
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On the Seismic Performance of Skewed Special Moment Frame Reduced Beam Section Connections
… dissertation investigates the effect of adding skew within SMF RBS connections and provides insights into allowable skew levels for design, widening the application of SMF RBS connections.</p> <p>The study presented herein involves parametric component-level analyses and system-level dynamic …
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Development of design criteria for continuous composite I-beam bridges with skew and right alignments
… 44 to 124 feet, girder spacing 6 to 10 feet, skew angle varied from 0 to 63 degree, and, thickness of slab was between 6 to 12 inch. Similarly, AASHTO 89 and 94 loading provisions were incorporated in producing maximum positive and negative bending moments in the girders. A computationally …
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Estudo comparativo de análise numérica aplicada a placas esconsas
… applied to the calculation of simply supported skew plates. Convergence towards the analytic solution has been examined for different skew angles, and computed the increase of time of calculation due to the mesh refinement. An automatic program of finite difference for oblique mesh has been …
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Defining a Model for Tool Consumption Rate on Asphalt Reclamation Machines
… on tip breakage. We have also shown that bit skew angle has a large positive effect on body abrasive wear.</p>
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A study of the application of air-jet vortex generators to intake ducts
… of the flow field. The optimum pitch and skew angle configuration for the air jets in terms of maximum enhancement of the flow field was predicted with 30° pitch and 75° skew angle.
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Page segmentation and identification for document image analysis
… of several steps. For instance, to detect the skew angle of the document, we use the Hough transform and the most frequently occurring local maximum. Moreover, in order to segment the page into regions, we have developed a novel approach based on diagonal scanning and node-edge orientation. …
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The Influence of a Skewed Disk on a Flexible Rotating Shaft
… were conducted to verify the existing theory of skewed disk forced response predictions. The experimental tests were conducted on a horizontal flexible shaft rotor system supported in two hydrodynamic journal bearings. The computer simulations were conducted with a program that uses a matrix …
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A new appreciation of inflow modelling for autorotative rotors
… includes a discussion about the small wake skew angle assumption, which is invariably used in the derivation of Peters and He model. The mathematical validity of the assumption is cast doubt, despite the resultant model has experimentally been fully validated. The author discusses on a …
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Thermal Response of Integral Abutment Bridges With Mse Walls: Numerical Analyses and a Practical Analysis Tool
… direction when the abutment wall is at a skew angle to the bridge alignment. The spreadsheet accommodates seven different pile sizes, which can be oriented in weak or strong directions, with variable offset of the abutment from the MSE wall and for variable skew angles. The spreadsheet …
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Effect of Column Axial Load on Skewed SMF RBS Connection Demands
… that limit the use of non-orthogonal (skewed) beam-column connection geometries. A recent study has investigated laterally skewed moment frame connections, indicating that skew increases the potential for column twist and column flange yielding; however, it is unclear how realistic …
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An analysis of transportation asset damage and repair costs after inland flood events
… other bridge attributes including length, width, skew angle, and type of foundation which have a correlation to different damage modes of bridges. A series of National Bridge Inventory condition ratings are analyzed with the scour criticality rating and superstructure rating both being significant …
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Seismic performance assessment of quasi-isolated highway bridges with seat-type abutments
… variations in the span arrangement, girder type, skew angle, pier column height, and foundation soil condition were computationally studied. Detailed yet efficient three-dimensional nonlinear finite-element models were developed for the bridges, incorporating various critical structural components …
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Experimental Study of Tsunami-Induced Loads on Bridges
… (4) the impact of a tsunami bore on a skewed box section bridge deck with different skew angles and deck clearances; (5) the performance of a skewed deck-girder section bridge under tsunami bore impact with different skew angles, deck clearances and handrails (i.e. solid and porous …
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Flow in two-stage channels with the main channel skewed to the flood plain direction
… channel, where the flow in the main channel is skewed slightly to the flood plain flow direction. The purpose of the study is to investigate flow mechanisms and flow behaviour in a situation which is more complex than a straight/parallel compound channel and less complex than meandering compound …