Warning: Matrix is close to singular or badly scaled.
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a=cos(pi/6);
b=cos(pi/3);
% Fab Fag Fbc Fbg Fcd Fcf Fcg Fde Fdf Ffe Fgf Ax Ay Ey
T=[ b 1 0 0 0 0 0 0 0 0 0 1 0 0 ;% Ax
a 0 0 0 0 0 0 0 0 0 0 0 1 0 ;% Ay
-b 0 1 b 0 0 0 0 0 0 0 0 0 0 ;% Bx
-a 0 0 a 0 0 0 0 0 0 0 0 0 0 ;% By
0 0 -1 0 1 b b 0 0 0 0 0 0 0 ;% Cx
0 0 0 0 0 a a 0 0 0 0 0 0 0 ;% Cy
0 0 0 0 -1 0 0 b b 0 0 0 0 0 ;% Dx
0 0 0 0 0 0 0 a a 0 0 0 0 0 ;% Dy
0 0 0 0 0 0 0 -b 0 -1 0 0 0 0 ;% Ex
0 0 0 0 0 0 0 -a 0 0 0 0 0 1 ;% Ey
0 0 0 0 0 -b 0 0 -b 1 -1 0 0 0 ;% Fx
0 0 0 0 0 -a 0 0 -a 0 0 0 0 0 ;% Fy
0 -1 0 -b 0 0 -b 0 0 0 1 0 0 0 ;% Gx
0 0 0 -a 0 0 -a 0 0 0 0 0 0 0];% Gy
F=[ 0; 0;0;0;0; 0;0; 0;0; 0;0;-8;0;-6 ]; % Applied forces, as shown on the truss
M=inv(T)*(-F)
1 Kommentar
darova
am 30 Jan. 2021
Its because of inv(T). It doesn't exist. Are you sure your stiffnes matrix is correct?
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