joint coordinates
1 0 0
2 2 0
3 4 0
4 6 0
5 1 1.732
6 3 1.732
7 5 1.732

Member incidences
1  1 2
2  2 3
3  3 4
4  5 6
5  6 7
6  1 5
7  2 5
8  2 6
9  3 6
10 3 7
11 4 7

Joint loads
2 0 -10
3 0 -10
1 0  10
4 0  10
