00:03
Given that, the courses on joints in a truss structure are minus 8 f1 plus 2 f2 equal to 1.
00:13
24 f1 minus 6 f2 equal to minus 3.
00:19
12 f2 plus 8 f3 equal to 6.
00:25
12 f1 plus 2 f2 equal to 2.
00:30
We have to find f1, f2 and f2 and to check is the obtained solution unique or other solution.
01:01
The solution is we construct the following matrix for gaussian.
01:23
Elimination the augmented matrix is minus 8 to 0 1 24 minus 6 0 minus 3 0 12 8 6 to apply row transformation r1 changes to minus 1 divided by 8 r1 the matrix we get 1 minus 1 divided by 4 0 minus 1 divided by 8 24 minus 6 0 minus 3 0 12 8 6 12202 apply other road transformation that if r2 changes to r2 minus 24 r1 and r4 changes to r4 minus 12 r1 the matrix we get 1 minus 1 divided by 4 0 minus 1 divided by 8 0 0 012 8 6 012 8 6 0 0 5 0 7 divided by 2 row r2 changes 2 r 3 the matrix we get 1 minus 1 minus 1 1 divided by 4 0 minus 1 divided by 8, 0, 12, 8, 6, 0, 0, 0, 0, 0, 0, 0, 0, 0, 7 divided by 2.
03:43
We draw 2 changes to 1 divided by 12, multiplied by r2.
03:52
The matrix we get 1, minus 1 divided by 4, 0, 0, 0 ,000...