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    Bridge

    Understanding Creep Analysis Through Flexibility Methods

    Table of Contents Click the table of contents for details.

    Creep Analysis 3



    The blog article of Creep Analysis 3 showed how Dr. Ghali et al. explained the creep analysis by flexibility methods.


    To better understand the creep behavior, solve the previous example in a less efficient way. Here, different sign conventions will be applied.

     

     
    Sign Convention
    Sign Convention
     

    At time t0, the immediate displacements/rotations for member 1 due to uniform loads are

     

    At time t0, the immediate displacements rotations for member 1 due to uniform loads

    At time t1, the immediate displacements/rotations due to uniform loads at span 2 are (MIDAS file ex4.2A)

     

    At time t1, the immediate displacements rotations due to uniform loads at span 2

    The signs in the table are according to the global axis. Converting into element local axis,

     

    The signs in the table are according to the global axis

    Restrained displacements/rotations are

     

    Restrained displacements rotations_1

    Restrained displacements rotations 2

    Let

    Restrained displacements rotations 3

    Restrained member end forces are

     

    Restrained member end forces

    The remaining calculations are the same as the previous example.

     

    About the Editor
    Seungwoo Lee PhD, P.E., S.E.
    Senior Supervising Engineer at WSP USAs (Tampa, FL)

    He is a Senior Supervising Engineer with a high level of expertise in the design and analysis of suspension bridges. He has a solid fundamental understanding of structures and can apply his knowledge exceptionally well to the design and analysis of highly complex structures. He is also a strong communicator, able to identify and distill the key information that is relevant to the task at hand and present it in a clear and quickly understandable manner.

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