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  1. aouiche

    natural frequency portal frame

    Sorry it's in rad/s
  2. aouiche

    natural frequency portal frame

    Thanks,but we have the value of 13 which appear twice why i think it is the solution of my question
  3. aouiche

    natural frequency portal frame

    ...13.39066267 22.05520949 31.60227434 35.89970274 39.23440003 50.30038346 61.72612467 73.51958827 88.75778292 112.1136364 119.6581416 134.0316193 next the structure should be submit to lateral force 150*sin(f*t).the author indicate that natural frequency is 12.69 Why I have 15 valus, thanks for...
  4. aouiche

    Time History Analysis Of 2D Frame Using MATLAB (El Centro)

    I have the same probleme and i think that the problem is to use technique such static condensation méthod to resolve system
  5. aouiche

    matlab script to resolve free vibration analysis

    I m trying to resolve a problem of simple portale frame restrained at base were each bar is descritized to 4 element (11 node X 3ddl=33 subject to dynamic load, so we can reduce the problem if the bar have just 2 node in this case with the two restrained node at base we can reduce the problem to...
  6. aouiche

    matlab script to resolve free vibration analysis

    ...(2x2)) to resolve system (33x33) mt=[0 0 30 0;0,0,0,50;30,0,0,0;0,50,0,80]; kt=[-40,0,0,0;0,-50,0,0;0,0,35000,-25000;0,0,-25000, 4000]; Z=inv(mt)*kt; [V,D]=eig(Z); disp('Eigenvalues') DS=[D(1,1),D(2,2),D(3,3),D(4,4)] disp('Eigenvectors') V x0=[0;0;0.01;0]; S=inv(V)*x0...
  7. aouiche

    Natural frequency of frame structure with general mass sitiffness and viscous dumpinig (M DOF)

    ...system M(22,22)which is the sum off all consistent mass matrix of the structure.To obtain the natural frequency i uses this code: Z=(inv(M))*K; [V,D]=eig(Z); Omega=(sqrt(diag(D))); Freq=((Omega))/(2*pi); I get Warning: Matrix is close to singular or badly scaled. Results may be inaccurate...
  8. aouiche

    Natural frequency of frame structure with general mass sitiffness and viscous dumpinig (M DOF)

    [bigears]Thanks for your answers
  9. aouiche

    Natural frequency of frame structure with general mass sitiffness and viscous dumpinig (M DOF)

    yes i have a system where C(due to the viscous dumping in the joint) ,M (consistent e matrix) and K are not diagonal Regards.
  10. aouiche

    Natural frequency of frame structure with general mass sitiffness and viscous dumpinig (M DOF)

    the link by item SUKEO KAWASffiMA.pdf
  11. aouiche

    Natural frequency of frame structure with general mass sitiffness and viscous dumpinig (M DOF)

    sorry for the link the new link containing the pdf (kawashima_dynamic experiment of portal frame) and ([M],[C],[K]) results finally the function Rajasteran to obtain natural frequency all are in the folder in the link bellow:
  12. aouiche

    Natural frequency of frame structure with general mass sitiffness and viscous dumpinig (M DOF)

    the first question:in the mass matrix the area A is not indicate in the doccument or in any other document I found in the net second :My results are given in folder system ([M],[C],[K]) I use to resolve it this code RAJESKARAN(folder system) but the results are not conform Thanks to help
  13. aouiche

    Natural frequency of frame structure with general mass sitiffness and viscous dumpinig (M DOF)

    Sorry,for the misunderstanding and for ma bade language. and i will try to explain my problem better: I try to verify the experimental results (natural frequency of simple portale frame with semi rigid joint) obtained par SUKEO KAWASffiMA
  14. aouiche

    Natural frequency of frame structure with general mass sitiffness and viscous dumpinig (M DOF)

    shut your mouth arrogant
  15. aouiche

    Natural frequency of frame structure with general mass sitiffness and viscous dumpinig (M DOF)

    I m a new user of matlab and i have a question about how to obtain natural frequency and mode shape corresponding in the general case of system mass,sitiffness and viscous dumpinig (MDOF) Example: m=[40000 4000 0;0 30000 0;50000 0 20000]; c=[330 0 0;0 -8000 8000;0 -8000 8000]; k=[30000...
  16. aouiche

    matlab dynamic simulation frame structure

    thanks JIM,i find what i would like do (http://newcivil.com/ncen/?p=206) but the script present somme error if you can help thanks again
  17. aouiche

    matlab dynamic simulation frame structure

    can somme one help me to resolve using matlab a dynamic system of diferentiel equation representing the dynamic behavior of frame structure(the matrix system is obtained by using finite element method) thanks
  18. aouiche

    Procedures of Geometric Nonlinear Analysis Using Secant Stiffness Method

    sorry for the attached file and thanks for the linkhttp://files.engineering.com/getfile.aspx?folder=ece8974f-562b-4e02-bcfe-3f12c3bc480d&file=SECANT_STIFFNESS_BIEN_DEFINI.pdf
  19. aouiche

    Procedures of Geometric Nonlinear Analysis Using Secant Stiffness Method

    for first problem i think he mean :[K] = [Ke] and [Kg]=0
  20. aouiche

    Procedures of Geometric Nonlinear Analysis Using Secant Stiffness Method

    I'm trying to develop a computer program to analysis frame including p-delta effect using secant stiffness method but i have problems to understand the procedure mentioned in the attached file 1.Set up the member stiffness matrices for all members and assemble them in structure stiffness matrix...

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