像这种结构的话,节点怎么编码,节点约束特征怎么设置。为什么我求出来的力,腹肝的轴力总为0。我的节点编号如附件里面的,节点约束特征是 0 0 0 0 0 0 1 1 0 0 0 0 1 1 0 0 0 0 1 1 0 0 0 0 0 0 0 1 1 0 0 0 0 1 1 0 0 0 0 1 1 0 -1 -1 -1 -1 -1 -1
0 0 0
1 1 0
0 0 0
1 1 0
0 0 0
1 1 0
0 0 0
0 0 0
1 1 0
0 0 0
1 1 0
0 0 0
1 1 0
-1 -1 -1
-1 -1 -1