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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 28 for “"live loads"”.
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Long-span bridge live loads.
Thesis: M.S., Massachusetts Institute of Technology, Department of Civil Engineering, 1973
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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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Analytical Solution of two Traction-Value Problems in Second-Order Elasticity with Live Loads
… of Signorini's method to the case of live loads which allows us to derive approximate solutions to some pure traction-value problems in finite elastostatics. The boundary-value problems and the corresponding compatibility conditions are formulated in order to determine the displacement …
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A Numerical Based Determination of Stress Intensity Factors for Partially Cracked Flexural I-shaped Cross-sections
… designed to resist fatigue cracking from service loads, cracks in the tension flanges of steel bridge girders have been observed as a result of stress concentrations, design errors, welding quality control, and vehicular impacts. Cracks can grow in size with time and active cyclic live loads and …
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Rational load rating of deck-girder bridges with girder end shear cracks in reverse orientation
… analysis is used to distribute the truck live loads from within the deck panels to the surrounding girders and diaphragms. Stiffness matrices are utilized to find the nodal displacements then the reactions at the girder supports caused by the truck live loads and bridge dead load. These …
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Tensões devidas ao bi-momento em tabuleiros de pontes de concreto armado bi-apoiadas e com contrapesos maciços
… Moreover the warping moment influence lines for live loads are presented. Finally, the appendices present the user’s manuals plus computer programs, specially designed for pocket calculators TI-59, for obtaining the warping moment influence line ordinates, warping moment ordinates for fixed-end …
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Evaluation of Strength and Hydraulic Properties of Buried Pipe Systems Used for Stormwater Harvesting
… of bundle systems under the effects of dead and live loads. Three different cover configuration were studied ranging from 18 inches to 43 inches of depth. Draw-wire sensors, a type of displacement sensors, were placed inside buried housing structures to monitor deformation values experienced by …
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Computation of bridge strains: a comparison of the methods of wheel weights, and of uniform loads and engine excess
Made available in DSpace on 2016-11-09T23:47:59Z (GMT). No. of bitstreams: 2 5939463_opt.pdf: 13180326 bytes, checksum: 4b8e924317105777b83ca7ad79861ab6 (MD5) license.txt: 4183 bytes, checksum: 1dcc2037833d76bede73d5717587543b (MD5) Previous issue date: 1880
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Adaptively prestressed concrete structures
… is developed. For the control of fluctuating live loads, a fuzzy logic based control scheme is proposed. Criteria for the selection of actuator technologies are given, and candidate actuator technologies are described and evaluated. Lastly, the problems associated with integrating the system …
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Structural engineering for northern Pakistan : indigenous architecture and earthquake resistance
… for building types and spatial use (i.e. live loads on the roofs), material availability, and appropriate technologies. Seismic loads were the main structural concern, and the behavior of single story, masonry buildings under seismic loads was investigated. Houses constructed from …
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Three-dimensional thermal analysis of curved concrete box girder bridges
… can be as large as those caused by dead and live loads. Prediction of such temperature variations is a complex problem since the temperature varies with time, within the bridge cross-section, as well as from section to section along the bridge length. In long straight bridges with constant …
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Slab-on-girder prestressed concrete bridges: linear and nonlinear finite element analysis and experimental load tests
… to contribute to the overall distribution of live loads in bridges. Cast-in-place concrete intermediate diaphragms were investigated in this study in order to assess their load distribution effectiveness in prestressed concrete I-girder bridges. Finite element packages (Ansys and GT STRUDL) …
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Investigation of the performance of flexible pavement systems under moving loads using finite element analyses
<p>The introduction of larger and heavier aircraft with more complex wheel configurations is making the current design methods inadequate for airfield pavements. In addition, airport pavements experience significant wander. However, the effect of wander on airport pavement performance has not been …
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Model Validation for a Steel Deck Truss Bridge over the New River
… with data recorded from 14 members during live load testing. The research presented herein is part of a larger endeavor to understand the structural behavior and collapse mechanism of the erstwhile I-35W bridge in Minneapolis, MN. Objectives accomplished toward this end include …
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Development of a Composite Concrete Bridge System for Short-to-Medium-Span Bridges
… of transverse bending due to concentrated wheel loads are investigated with respect to reflective cracking. Transverse bending moment are quantified and compared to transverse moment capacities provided by a combination of various cross-sectional shapes and transverse connections. A design …
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Influence of moving load, structure, temperature gradient, and wheel configuration on load transfer efficiency
… the interaction of pavement with vehicular loads and climatic conditions. The Federal Aviation Administration (FAA) uses a mechanistic design procedure, FAARFIELD, for the design of rigid airport pavements. The FAARFIELD (FAA Rigid and Flexible Iterative Elastic Layer Design) procedure is …
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The Behaviour of Plank (Tongue and Groove) Wood Decking Under the Effects of Uniformly Distributed and Concentrated Loads
… and beam timber construction to transfer gravity loads on roofs and floors. In 2010, The National Building Code of Canada changed the application area of the specified concentrated roof live loads from 750 mm x 750 mm to 200 mm x 200 mm. The change was made to better reflect the area which a …
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Continuity of bridges composed of simple-span precast prestressed concrete girders made continuous
… decks and diaphragms are continuous only for live loads and superimposed dead loads. The continuity diaphragms often crack due to time dependent effects in the girders. These cracks not only impair bridge ascetics and durability, but also reduce "degree of continuity". A related issue is that …
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Recommendations for Longitudinal Post-Tensioning in Full-Depth Precast Concrete Bridge Deck Panels
… compression under permanent and time-dependent loads throughout each bridge's service life. The precast decks of the two and three span continuous bridges with steel girders, however, needed a significantly higher level of initial compression due to the negative moments created by live loads.
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