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Homework Help: Finding Forces in a tie rod.

  1. Jun 5, 2009 #1
    Hey all!

    I have a project question I'm struggling on:
    The rigid structure ABD in Figure 1 is supported at B by a 35-mm-diameter tie rod (1)
    and at A by a 30-mm-diameter pin used in a single shear connection. The tie rod is
    connected at B and C by 24-mm diameter pins used in double shear connections. Tie
    rod H has yield strength of 250 MPa, and each of the pins has ultimate shear strength
    of 330 MPa. A concentrated load of P = 50 kN acts at D. Determine:
    (a) The normal stress in rod (1).

    http://img269.imageshack.us/img269/2382/question1a.jpg [Broken]

    My main problem is I am unsure where to place the reaction forces with regards to pins so that I can use moments and forces in the x and y direction to determine the force in the rod. Once i know this I can find the stress in the rod.

    Any help would be great!
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Jun 5, 2009 #2


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    Homework Helper

    Place the reaction forces at the supports, A and C. Solve for the reaction forces using statics.
  4. Jun 7, 2009 #3


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    Gold Member

    Also your tie rod (1) is a two force member.
  5. Jun 7, 2009 #4
    Try making a cut in member (1) and then take the moments about A. You should be able to solve for the axial force directly by using you 3 equations of equilibrium.

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