What Are The Advantages Of Assigning The Central Pier And The Abutment As Fixed Piers?

What Are The Advantages Of Assigning The Central Pier And The Abutment As Fixed Piers?


  • Posted by  Sudheer Kumar Raaju 
    13 Jun, 2012

    Question

    What are the advantages of assigning the central pier and the abutment as fixed
    piers?

    Answer:

    (i) For abutment pier to be assigned as fixed pier while the bridge is quite long, the
    longitudinal loads due to earthquake are quite large. As the earthquake loads are
    resisted by fixed piers, the size of fixed piers will be large and massive. In this
    connection, for better aesthetic appearance, the selection of abutment as fixed piers
    could accommodate the large size and massiveness of piers. Normally abutments are
    relatively short in height and for the same horizontal force, the bending moment induced is smaller.

    (ii) For the central pier to be selected as the fixed pier, the bridge deck is allowed to move starting from the central pier to the end of the bridge. However, if the fixed pier is located at the abutment, the amount of movement to be incorporated in each bearing due to temperature variation, shrinkage, etc. is more than that when the fixed pier is located at central pier. Therefore, the size of movement joints can be reduced
    significantly.

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