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 8 of 8 for “"negative bending"”.
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Development of design criteria for continuous composite I-beam bridges with skew and right alignments
… of 288 bridges was done for both positive and negative moments. All these structures had a regular geometry, with a uniform concrete deck resting on five identical prismatic and equally spaced steel built-up plate girders. Spans ranged from 44 to 124 feet, girder spacing 6 to 10 feet, skew …
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Increasing residual structural capacity of cracked concrete railroad crossties with polypropylene fibers
… once the concrete has cracked. The center negative flexural cracking is considered as a serious failure mode in concrete railroad crossties, which decreases structural capacity and results in safety issues. It also leads to deterioration of prestressed concrete crossties and shortens the …
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Flexural behavior of prestressed concrete monoblock crossties
… model was also used to calculate theoretical bending moment values under ballast reactions measured in the field. Based on the results of these analyses, recommendations to improve current design and maintenance practices for prestressed concrete crossties are presented. To measure the bending …
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Evaluation of moment redistribution for hybrid HPS 70W bridge girders
… that permit up to 10% of the maximum factored negative bending moments to be redistributed to positive bending regions in members comprised of compact sections. However, the more recent procedures may be used for a wider range of sections, including those with non-compact webs, and specifically …
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Flexural distress and degradation mechanisms in pretensioned concrete beams and railroad crossties
… of a statistical model for expected center-negative bending capacity; identification of damage mechanisms in pretensioned beams due to interaction of water with cracks through testing of multiple working hypotheses; and a stress estimation method for cracked pretensioned beams that serves as …
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The Investigation of Transverse Joints and Grouts on Full Depth Concrete Bridge Deck Panels
… was tested on a full scale two girder setup in negative bending with a simulated HS-20 vehicle. The blockouts were built as hollow concrete rings filled with grout and left to shrink under ambient conditions. Thirteen combinations of different surface conditions and grouts were designed to test …