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