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PCI eLearning Course T523: Girder Stability During ...
Recommended Practice for Lateral Stability of Prec ...
Recommended Practice for Lateral Stability of Precast, Prestressed Concrete Bridge Girders CB-02-16
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Pdf Summary
The document titled "Recommended Practice for Lateral Stability of Precast, Prestressed Concrete Bridge Girders," published by the Precast/Prestressed Concrete Institute (PCI) in 2016, contains guidelines and recommendations for ensuring the lateral stability of precast, prestressed concrete bridge girders during various stages from production to installation.<br /><br />Key components of the publication include:<br />1. **Background and Context**: Precast, prestressed concrete has been vital in bridge construction since the 1950s. The evolution of high-performance materials has led to longer and more slender girders, raising concerns about their lateral stability during handling, transport, and erection.<br /> <br />2. **Criteria for Stability**: The document outlines the criteria crucial for ensuring girder stability, encompassing applied loads, material properties, tolerances, stress limitations, and overall safety factors. These factors ensure that girders are stable throughout different construction phases.<br /> <br />3. **Evaluation of Stability**: <br /> - **Hanging Girders**: Stability is examined for girders lifted from above, combining the principles of equilibrium of forces with analysis under loading conditions such as wind.<br /> - **Seated Girders**: Stability is checked for girders supported from below, considering rotational stiffness of supports and external forces (e.g., wind and centrifugal forces).<br /> <br />4. **Detailed Example Calculations**: Various example scenarios demonstrate calculations for different conditions, such as lifting with vertical and inclined cables and transporting with consideration to wind and impact forces.<br /> <br />5. **Recommended Practices**: Detailed steps for designing and analyzing stability, including guidance on manufacturing practices to ensure alignment, camber, and minimal sweep. Instructions on handling, bracing, transportation, and erection are provided.<br /> <br />6. **Empirical Data and Research References**: The guidelines incorporate modern research, findings, and feedback from industry professionals, including results from surveys distributed to state bridge engineers and industry professionals.<br /><br />7. **Safe Practices and Compliance**: Emphasized is the need for adherence to specified guidelines to ensure safety, involving clear responsibilities for bridge engineers, manufacturers, contractors, and transporters.<br /><br />This document serves as a critical resource for professionals involved in designing, manufacturing, and installing precast, prestressed concrete girders, ensuring stability from production to final placement in a bridge structure. The guidelines aim to mitigate risks of failure due to lateral instability through meticulous planning and evaluation.
Keywords
lateral stability
precast concrete
prestressed girders
bridge construction
stability criteria
example calculations
handling and transport
manufacturing practices
safety compliance
empirical data
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