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Showing 1 to 16 of 16 for “"Transfer length"”.
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Transfer Length, Development Length, Flexural Strength, and Prestress Loss Evaluation in Pretensioned Self-Consolidating Concrete Members
… concrete versus normal concrete on transfer and development lengths, and flexural strengths of prestressed members. Three small rectangular members were made, two cast with SCC mixes and one cast with a conventional mix, to determine the transfer length of each mix. Transfer lengths …
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Investigation of Transfer Length, Development Length, Flexural Strength and Prestress Loss Trend in Fully Bonded High Strength Lightweight Prestressed Girders
… about by the reduction of dead loads in bridges. Transfer Length measurements conducted on two AASHTO Type IV HSLWC prestressed girders, resulted in an average transfer length of 17 inches, well below the AASHTO and ACI guidance. Two girders composed of HSLWC AASHTO Type II girders and a 48" x 8" …
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Grade 300 Prestressing Strand and the Effect of Vertical Casting Position
… the effect the as-cast vertical location had on transfer length, development length, and flexural strength and to resolve the discrepancies regarding the definition of the top-bar/strand effect. Two types of test specimens were fabricated and tested investigating each respective item. The …
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Étude des recouvrements avec effet de barrière capillaire pour minimiser les infiltrations d'eau dans les sites d'enfouissement de matières résiduelles
… composing the barrier and determination of the transfer length (TL) using an appropriate model. The latter had to be shorter than the total length of the cell (30 m), in order to allow for verification of the design hypothesis. The objective of this project was to evaluate the performance of the …
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Structural Performance of High Strength Lightweight Concrete Pretensioned Bridge Girders
… whether current bridge design specifications for transfer length, development length, prestress loss, camber, and flexural capacity are satisfactory for use with fully-bonded, pretensioned flexural members consisting of HSLWC and to make recommendations for improvements where necessary. Twelve …
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Device Stack Optimization for Protonic Non-Volatile Programmable Resistors
… process, with the help of circular transfer length model (CTLM), which efficiently examines the resistance properties of WO₃. We have explored: (a) device protonation as part of the fabrication process, (b) encapsulation preventing proton depletion during device fabrication and …
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Thermal imaging and analysis of carbon nanotube composites
… contact resistance and heat loss to ambient. Transfer length method measurements were used to extract electrical contact resistance between the film and the electrodes. These methods were applied to investigate the properties of CNT films with several different morphologies, revealing that …
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Top Strand Effect and Evaluation of Effective Prestress in Prestressed Concrete Beams
… The "top strand effect" was evaluated through transfer and development length tests of prestressed concrete beams. Eight beams were cast with normal orientation, while four beams were cast with inverted orientation so that a significant depth of fresh concrete was placed below prestressing …
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Global and local performance of prestressed girder bridges with positive moment continuity detail
… and some live load positions, and on the force transfer mechanisms through the diaphragm. The study utilized different approaches including analytical models for temperature evaluations and finite element models for structural assessments. Field data from a bridge using the new detail were used …
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The Development of a Steel Embedded Connection for Double-Tee Beams
… of parking garages. Typical double-tee lengths are 60 to 75 feet; however, for this research 20 ft long segments were cast and tested with the shooter installed. This project had three main goals. The first goal was to develop a preliminary design for the reinforcement around the shooter …
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Material Properties of the Grade 300 and Grade 270 Prestressing Strands and their Impact on the Design of Bridges
… needs to be done to include stress-corrosion, transfer length, development length, and flexural strength, the completed testing indicates that less strand will be required using Grade 300 strand versus Grade 270 strand to achieve a set span length and transverse girder spacing. In addition, …
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Bond and Material Properties of Grade 270 and Grade 300 Prestressing Strands
… compared to one another as well as to measured transfer and development lengths from beams using the strand from the same reel. All of the strands showed sufficient bond in the beams, but one strand type did fail both the NASP Test and the LBPT. Both pullout tests were acceptable methods to …
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Transfer and Development Lengths of Steel Strands in Full-Scale Prestressed Self-Consolidating Concrete Bridge Girders
… of SCC’s bond strength, including its impact on transfer and development lengths in prestressed members, is essential to safely implement SCC in prestressed design. The Illinois Department of Transportation (IDOT) has sponsored a three-phase study exploring the bond behavior of steel strands in …
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Graphene Nanotechnology the Next Generation Logic, Memory and 3D Integrated Circuits
… resistivity (ρc), contact resistance (RC) and transfer length (LT), investigation of the ways to incorporate the developed contact model into the electronic design automation (EDA) tools and investigation of different contact materials for the metal-MoS2 contact. The three dimensional …
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High speed mask-less laser-controlled precision micro-additive manufacture
… to the continuous wave light at the same wavelength) thus the deposition would be compatible with a large range of materials, and (3) the development of higher frequency repetition rate ultrafast lasers would enable higher deposition rates. A deposition system was set-up for the study to …
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Self-Compacting Concrete for Prestressed Bridge Girders
… girders were Mn/DOT 36M I-girders with a span length of 38 ft, and design concrete compressive strengths of 7.5 ksi at release and 9.0 ksi at 28 days. The girders were designed incorporating 36 straight strands in the bottom flange, and four strands in the top flange to avoid the need to drape …