TRIANGULATED
STRUCTURES
ARTIFICIAL
SUSPENDED
TRACTION
SHELL
FRAME
SHEAR
U
S
U
L
A
I
C
I
F
I
T
R
A
X
W
C
K
N
A
C
Z
G
U
Z
U
P
E
T
V
D
O
Z
H
Y
I
S
E
F
P
O
R
U
A
I
E
N
G
M
K
G
H
C
Y
A
G
S
H
T
E
T
Q
Y
H
R
I
E
C
I
E
I
A
O
G
B
A
A
M
E
A
T
L
R
N
W
V
E
N
R
E
L
E
E
I
E
U
L
E
F
O
O
O
V
K
Q
U
O
P
T
H
W
K
R
S
U
Y
Z
N
A
N
G
C
E
O
S
A
A
O
I
E
A
Y
U
P
U
N
W
H
U
E
M
K
N
M
A
I
F
R
A
P
A
W
T
U
E
Z
D
O
K
E
T
J
K
E
S
I
A
M
W
R
H
A
H
S
O
O
K
J
A
M
R
V
A
E
S
U
S
P
E
N
D
E
D
E
C
T
F
