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!

STATICS problem

  1. Oct 19, 2006 #1
    hey every1... i'm really really stuck on this problem and unless i get it and a few others right im gonna fail my engineering statics course :( Any help would be apreciated so much...


    The Question that goes with that diagram i've attatched is:

    Determine the bending moment at a distance x from the roller support on the left hand side, using the principles of virtual work.

    The values are: F = 2kn, d=2.200m and x=0.600m

    thankyou
     

    Attached Files:

    • Q1.jpg
      Q1.jpg
      File size:
      18.4 KB
      Views:
      74
  2. jcsd
  3. Oct 19, 2006 #2
    another im not sure about:

    Each of the two uniform hinged bars have a mass m and length L. Both bars are connected by hinge S and supported as shown. The structure is loaded by a mass of 4m, applied at the hinge S. Gravitational acceleration is g = 9.81m/s2.

    m= 15kg
    L=5.500m
    angle theta= 130 degrees

    Calculate the torque Ma (in Nm) required for equilibrium
     

    Attached Files:

    • Q2.jpg
      Q2.jpg
      File size:
      6.9 KB
      Views:
      60
  4. Oct 19, 2006 #3

    radou

    User Avatar
    Homework Helper

    The attachment isn't working, but I can give you some directions. If the system has zero degrees of freedom (i.e. it's not a mechanism), you should make it a mechanism by putting a hinge at the point where you need to find the bendig moment (0.6 m). Draw a displacement sketch of that mechanism, so that you make the hinge rotate for a unit angle, and calculate all the displacement on the places of the loads (i.e. the force F). Then use the principle of virtual work: 'The necessary and sufficient condition for the equilibrium of a rigid body is zero virtual work done by all external forces acting on the particle during any virtual displacement consistent with the constraints imposed on the body.' It's a bit stupid to explain this like I just have - in a 'half-blind' manner, but I hope it helps. :smile:

    P.S. The bending moment M you need to find acts at the place of the inserted hinge.
     
  5. Oct 19, 2006 #4
    Last edited: Oct 19, 2006
  6. Oct 19, 2006 #5

    radou

    User Avatar
    Homework Helper

    Go ahead, I hope I'll be able to help.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: STATICS problem
  1. Simple statics problem (Replies: 1)

Loading...