## Stiffness groups

|        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |
|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|
|        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |U1x     |
|        |Kuu_1_1  |        |        |Kuth_1_1 |        |        |Kuu_1_2  |        |        |Kuth_1_2 |        |        |Kuu_1_3  |        |        |Kuth_1_3 |        |        |U1y     |
|        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |U1z     |
|        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |Th1x    |
|        |Kthu_1_1 |        |        |Kthth_1_1|        |        |Kthu_1_2 |        |        |Kthth_1_2|        |        |Kthu_1_3 |        |        |Kthth_1_3|        |        |Th1y    |
|        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |Th1z    |
|        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |U2x     |
|        |Kuu_2_1  |        |        |Kuth_2_1 |        |        |Kuu_2_2  |        |        |Kuth_2_2 |        |        |Kuu_2_3  |        |        |Kuth_2_3 |        |        |U2y     |
|        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |U2z     |
|        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |Th2x    |
|        |Kthu_2_1 |        |        |Kthth_2_1|        |        |Kthu_2_2 |        |        |Kthth_2_2|        |        |Kthu_2_3 |        |        |Kthth_2_3|        |        |Th2y    |
|        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |Th2z    |
|        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |U3x     |
|        |Kuu_3_1  |        |        |Kuth_3_1 |        |        |Kuu_3_2  |        |        |Kuth_3_2 |        |        |Kuu_3_3  |        |        |Kuth_3_3 |        |        |U3y     |
|        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |U3z     |
|        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |Th3x    |
|        |Kthu_3_1 |        |        |Kthth_3_1|        |        |Kthu_3_2 |        |        |Kthth_3_2|        |        |Kthu_3_3 |        |        |Kthth_3_3|        |        |Th3y    |
|        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |Th3z    |