Results 1 to 6 of 6

Thread: Bolt load calculation

  1. #1
    Associate Engineer moneytree's Avatar
    Join Date
    Jul 2012
    Location
    UK
    Posts
    7

    Bolt load calculation

    Hi Folks

    I need some help with a bolt load calc.
    I have carried out the calc on FEA and need to check the calc by hand.
    I have a block bolted down with 4 bolts which has a load at one corner (see sketch)

    block_calc.jpg

    What is the load on each bolt so I can apply the correct loading torque ?

    Thanks

  2. #2
    Administrator Kelly Bramble's Avatar
    Join Date
    Feb 2011
    Location
    Bold Springs, GA
    Posts
    2,297
    Quote Originally Posted by moneytree View Post
    What is the load on each bolt so I can apply the correct loading torque ?
    Loading torque? Is it a static application? Sounds like your asking for a bolt torque...

    Am I missing something or are you actually looking for a bolt size for the applied shear?

    First determine the total shear load on each of the individual bolts. You will have greater shear load on the outer bolts than the inner bolts due to the applied torque. You can use vector math on each bolt to determine the applied shear due to the torque and vertical loading. Then back calculate the bolt cross section based on your desired bolt material with the FOS.

    You can determine the pre-load with the following.

    http://www.engineersedge.com/calcula...alculation.htm
    Last edited by Kelly Bramble; 02-18-2013 at 08:50 PM.

  3. #3
    Associate Engineer moneytree's Avatar
    Join Date
    Jul 2012
    Location
    UK
    Posts
    7

    Bolt load calcs

    [QUOTE=Kelly Bramble;5655]Loading torque? Is it a static application? Sounds like your asking for a bolt torque...

    Thanks Kelly.

    I am having one of my stupid days and can not for the life of me think how to calc the loads on the sketch attached.

    Any chance you can help.

    load_diagram2.jpg

    Many Thanks

    Moneytree.
    Last edited by moneytree; 02-19-2013 at 04:01 AM.

  4. #4
    Administrator Kelly Bramble's Avatar
    Join Date
    Feb 2011
    Location
    Bold Springs, GA
    Posts
    2,297
    Check out the following document -

    Old - but nothing changes...

    bolt-vector-forces.pdf

  5. #5
    Associate Engineer moneytree's Avatar
    Join Date
    Jul 2012
    Location
    UK
    Posts
    7
    Quote Originally Posted by Kelly Bramble View Post
    Check out the following document -

    Old - but nothing changes...

    bolt-vector-forces.pdf
    Thanks Kelly. Calcs now tie in with FEA.

  6. #6
    Administrator Kelly Bramble's Avatar
    Join Date
    Feb 2011
    Location
    Bold Springs, GA
    Posts
    2,297
    I know this thread is complete - however EE now has an online calculator that does the work..

    Eccentric Loading On Bolt Group One Vertical Row Calculator

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •