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Develop and Validate Precast Column Solutions for Texas Bridges
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2024-11-01
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Edition:September 2020 – July 2024
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Abstract:This research addresses the application of precast columns in Texas bridge construction. The project combines experimental and analytical methods to develop innovative design concepts and construction details for precast concrete columns. Key design concept includes a spun-cast precast shell filled with a cast-in-place (CIP) core and connecting reinforcement to the bent cap and the footing. The interface shear capacity between the shell and the core is also considered vital for composite action. The research involved comprehensive experimental investigations and finite element analyses into interface shear strength of small-scale specimens and into the constructability and structural performance of full-scale prototype specimens. Significant findings include the effectiveness of plastic shims for column alignment, the importance of proper vibration, and the impact of internal roughness on column placement. Regarding affecting factors on the structural performance, the developed precast column system was found to be comparable or superior compared to traditional TxDOT standard column design given that the design guidelines in this report are followed. The design guidelines were established based on extensive testing and modeling, recommending optimal dimensions, concrete strengths, reinforcement configurations, and connection details. A simplified analytical method for constructing the P-Minter active diagram was introduced. The project culminated in a set of detailed design recommendations aimed at enhancing the implementation of precast columns, improving efficiency, and ensuring structural integrity in bridge construction. This work provides valuable insights and guidelines for integrating precast columns into Texas bridge infrastructure, supporting advancements in both practical application and theoretical understanding.
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[PDF-33.34 MB]
