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MEG 443/643
Problem 4-1, Text
Use Symmetry to reduce the size of the problem.
1
3
20000 lb
1 3
2₂ 1 4
4
5
10000 lb
1 3
2
3
2 1
8ft 8ft
E . 30 10⁶
A1 10 A2 10 A3 20
2
L2 . 8 12 L3 . 6 12 L1 . 8² 6²12
1 atan⁶
8 2 . 0 180 3 . 90 180
T1
cos( ) 1
sin( ) 1
0
0
sin( ) 1
cos( ) 1
0
0
0
0
cos( ) 1
sin( ) 1
0
0
sin( ) 1
cos( ) 1
= T1
0.8
0.6
0
0
0.6
0.8
0
0
0
0
0.8
0.6
0
0
0.6
0.8
T2
cos( ) 2
sin( ) 2
0
0
sin( ) 2
cos( ) 2
0
0
0
0
cos( ) 2
sin( ) 2
0
0
sin( ) 2
cos( ) 2
= T2
1
0
0
0
0
1
0
0
0
0
1
0
0
0
0
1
T3
cos( ) 3
sin( ) 3
0
0
sin( ) 3
cos( ) 3
0
0
0
0
cos( ) 3
sin( ) 3
0
0
sin( ) 3
cos( ) 3
= T3
0
1
0
0
1
0
0
0
0
0
0
1
0
0
1
0
element 1 between nodes 1 and 3 k1 . .
1
0
1
0
0
0
0
0
1
0
1
0
0
0
0
0
E^A1
L1

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