Reduction of bridge construction and maintenance costs through coupled geotechnical and structural design of integral abutment bridges.
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2014-06-01
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Abstract:Elimination expansion joints in the superstructure of integral abutment bridges offers the advantage of reducing the initial and life cycle ; costs of the structure. However, such elimination may have an adverse effect on the displacement demand at the pile‐abutment ; connection and on the earth pressures on the abutment wall due to the thermal expansion/contraction cycles of the bridge. These ; adverse effects have resulted in regulations that impose restrictions on the maximum length and skew angle of integral abutment ; bridges. This research consisted of a deep analysis of the problem by considering soil‐structure interaction. The approach was ; multifaceted as it included experimental and numerical analysis. Upon calibration and verification of the constitutive model, it was used ; as part of a parametric analysis to provide recommendations for the design limits of integral abutment bridges. ; The analysis results showed that active state earth pressure is reached after the first contraction cycle. The displacement demand on ; piles is a function of the abutment wall displacement. Larger displacement demand of the pile at the acute corner when compared to ; the obtuse corner was observed during expansion and contraction cycles. The inflection point of the piles deformed shape was found to ; be at relatively shallow depth. Concrete shrinkage and sequence of loading affected significantly the displacement demand of the ; supporting piles, lower displacement demand of piles during the expansion cycle and larger displacement demand during contraction ; cycles. The analysis showed that a 500 ft bridge with 60° skew will provide acceptable long term performance.
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Main Document Checksum:urn:sha256:c4a8476dd0bf3a33f8a209ef3582792a1a34ab3fb735890cb7558b635b283edd