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Sorry it's in rad/s

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

...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...

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

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...

...(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...

...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...

[bigears]Thanks for your answers

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.

the link by item SUKEO KAWASffiMA.pdf

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:

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

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

shut your mouth arrogant

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...

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

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

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

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

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...