Condition to avoid separation of connected members

Q.  Which among the following is the condition to avoid separation of connected members?
- Published on 14 Sep 15

a. Force acting on the connected members should be negative
b. Force acting on the connected members should be positive
c. Force acting on the connected members should be neither positive nor negative
d. None of the above

ANSWER: Force acting on the connected members should be negative

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    Discussion

  • Sravanthi   -Posted on 04 Nov 15
    The condition to avoid joint separation is as follows:

    - Fm < 0 ------ (Fm = resultant force under each bolt on connected members)

    - (Kb /( Kb + Km))P < Fi

    - Fm = (1 – C) P - Fi

    here, Fi is the preload acting on a bolt due to tightening
    P is the total external force on bolts

    - C is the gasket factor which is given as: C = (Kb / (Kb + Km)), Km and Kb are the stiffness of connected members and bolts.

    - The separation of connected members can be avoided if the resultant force acting on the connected members is compressive or negative. The resultant force acting on connected members under each bolt should be less than zero

    - The separation of joints can be achieved if the resultant force acting on connected members is zero or positive.

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