Design of Concrete Bridge Beams Prestressed with CFRP Systems (2019) / Chapter Skim
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2 1.1 Background Prestressing concrete bridge beams with carbon fiber reinforced polymer (CFRP) tendons has been a research topic for the last three decades.
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Introduction 3 • Validating the prestress losses due to concrete creep and shrinkage, elastic shortening, and seating; • Quantifying the transfer length, camber, and long-term deflection of beams prestressed with CFRP cables and bars; • Characterizing the flexural behavior of the full-scale bridge girders; and • Calibrating the strength resistance factors for CFRP prestressed beams according to the LRFD philosophy. 1.3 Research Plan and Methodology The following tasks were performed to achieve the project objective: • Review of relevant practice, data, specifications, and research findings from both foreign and domestic sources on the prestressing of concrete girders using CFRP systems; • Identification of parameters that influence the design of CFRP prestressed beams, and the development of a work plan for the development of the design methods; • Execution of an experimental program involving testing of materials, small-scale beams and prisms, and full-scale prestressed concrete bridge beams; • Conduct of finite element simulations, sectional analyses, and reliability analyses to further understand the behavior at the material level and member level; • Preparation of proposed specifications and commentary for the design of CFRP prestressed concrete girders together with the design examples to illustrate the application of the recommended design methods and specifications; and • Preparation of a report that documents the entire research.
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4 Design of Concrete Bridge Beams Prestressed with CFRP Systems Compilation of Database Comparison and Evaluation of Existing Design Models Identify Parameters Affecting the Design of CFRP Prestressed Beams Deficiency of Existing Design Models Annotated Outline of the Proposed LRFD Bridge Design Specifications Recommend Design Method and Prepare Work Plan Issues to be addressed in this project Research Required to Develop Design Methods Beam Detailing: 1. Anchorage types 2.
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Introduction 5 Parameters that Influence the Behavior of CFRP Prestressed Beams Parameters not Covered by Previous Experimental Studies Remaining Parameters Experimental Program Numerical and Analytical Program Identify critical issues for tests and provide details of test girders Provide experimental data for the calibration of FE Models Experimental and Parametric Study Results Develop Design Methods Development of Bridge Design and Material Guide Specifications 1. Identify Existing Analytical Models 2.
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