1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Three pinned arch/ beams

  1. Jun 18, 2011 #1
    1. The problem statement, all variables and given/known data

    http://tinypic.com/r/2wbxm2s/7
    This is a series of beams pinned together at A, B, C
    Find reactions at a b c

    2. Relevant equations

    Sum of moments at B has to = 0, sum of Fx = 0, sum of Fy = 0

    3. The attempt at a solution
    Sum of moments about A, anti clockwise +ve
    2(-16) + 8Cy -4Cx = 0

    considering section BC
    sum of momeents about B
    4*-25 + 4Cy -8Cx= 0

    solving ffor Cx = 61.33


    I've been staring at this question all day, it has literally stopped making any sense.
     
  2. jcsd
  3. Jun 18, 2011 #2
  4. Jun 20, 2011 #3

    PhanthomJay

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    These equations are both correct
    You didn't solve the 2 equations correctly.
    Redo the algebra. Cx will come out negative , meaning you assumed the wrong direction for Cx. After finding Cy from these equations, use the other relevant equilibrium equations to solve for the support reactions Ax and Ay, and the internal forces Bx and By at B.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Three pinned arch/ beams
  1. Pin Joint Beam (Replies: 7)

  2. Solving Arched Beams (Replies: 0)

Loading...