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  1. rk_19

    mode participation factor

    So, how do I calculate that.
  2. rk_19

    mode participation factor

    Hi, I was writing the fe code in Fortran for performing modal analysis. I crosschecked the Eigen values/vectors with third party software and they are matching... are u telling that 'r' is the mode shape vector??... in my eqn, phi represents normalized Eigen vector.. I refered some materials and...
  3. rk_19

    mode participation factor

    hi, I am trying to calculate mode participation factors for a frame structure. the consistent mass matrix approach is used. I got the Eigen values, vectors, checked orthogonality - all ok. for calculating the mode participation, gamma=L/M, L is the coeff vector = [transpose(phi)]*[m]*[r]. how do...
  4. rk_19

    reduction of stiffness matrix when spring fixity is involved

    JasonMcKee71 (Structural), thanks ...
  5. rk_19

    reduction of stiffness matrix when spring fixity is involved

    Denial (Structural), thanks for your suggestion.. may b I was not well with explaning the problem.. ur understanding is correct - I have 6 independent springs representing an independent dof... thanks for your help, I will try this out... thanks IDS (Civil/Environmental) too
  6. rk_19

    reduction of stiffness matrix when spring fixity is involved

    Denial (Structural), thanks for the suggestion.. the spring at bottom has got 6 dofs (ie; axial stiffness in 2 horizontal+1 vertical and rotational stiffness in all these 3 cords, total = 6)....how do I add these to the stiffness coeff of the node representing the base?
  7. rk_19

    reduction of stiffness matrix when spring fixity is involved

    @IDS (Civil/Environmental), are telling to treat the spring supports as beam with relevant stiffness ? thanks
  8. rk_19

    reduction of stiffness matrix when spring fixity is involved

    @gravityandinertia (Structural) if the structure was a cantilever fixed at base, my reduced K matrix would be of size 6x6, now in this case, where I have springs in 6dof. how do I get to reduced matrix.. if I consider the base fixed and calculate the reactions, based on the stiffness of...
  9. rk_19

    reduction of stiffness matrix when spring fixity is involved

    hi, this is not a homework.. .. i have developed a code which can solve a typical frame structure assuming pinned or fixed foundation.. basically i eliminated the corresponding degrees of freedom from the stiffness matrix depending whether it is fixed or pinned...now i want to solve it...
  10. rk_19

    reduction of stiffness matrix when spring fixity is involved

    hi, I have a vertical cantilever beam which is having spring fixities in all 6 dofs (at the base)... there is a load in vertical and in lateral direction at the free end.... after developing the stiffness matrix, how do i do prepare the reduced K matrix - basically, how do i solve for the...
  11. rk_19

    STIFFNESS ANALYSIS - ACCOUNTING SELF WEIGHT

    thanks a lot
  12. rk_19

    STIFFNESS ANALYSIS - ACCOUNTING SELF WEIGHT

    hi, i am writing a code in fortran for static analysis of portal frames. the intention is to put some point loads on the structure and analyse it to get the reactions/displacements. could some one explain how to consider the self weight of structure in the analysis. thanks, RKR

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