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Homework Help: Bending for beam - deflection

  1. Apr 15, 2007 #1
    bending for beam -- deflection

    1. The problem statement, all variables and given/known data

    bending for beam -- deflection

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Apr 15, 2007 #2


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    Homework Helper

    In order to get help, you should show some attempts in solving the problem. Filling up the part "Relevant equations" would be a step forward.

    You may consider yourself lucky that I wrote that, since it's self-understood on this forum and can be found in guidelines etc. ; the only reason I pointed it out (again and again) is that I don't want anybody new to PF to think that questions are ignored.
  4. Apr 16, 2007 #3
    my solution

    3. The attempt at a solution

    i was tried, but the answer was wrong

    my solution
    vertical equilibirum: Ra=Rc=1/2(P+3*W)

    Second moment of area: I = (PI/64)*(D^4-d^4)=4.2726*10^-6 m^4
    bending moment equation from load intensity



    Integrated one more time


    NOW take the boundary conditions:

    at x=0, deflection V=0, so C2=0
    at x=1.5m deflection v=3mm so, caculate the C1
  5. Apr 16, 2007 #4
    after caculate the C1, LHS=RHS=0

    so i can't continue

  6. Apr 16, 2007 #5
    Thank for your remind!
  7. Apr 16, 2007 #6


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    There is one more boundary condition you need to use on w'(x) in order to obtain a system of two equations with two unknowns, C1 and P.
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