7-99
,
7-100
7-101 0
7-102
7-103
7-104 [
F
F
V
M
M
F
7-106
7-107
; ,
Point on bar
M (N-mm) S (mm
3
) r/h; H/h K
t
(MPa)
B 16 000 192 0.250; 2.0 1.42 118.3 – Maximum
C 32 000 768 0.125; 1.50 1.68 70.0
P = 200 N
P
2P P
t
= 8.0 mm
7-108
7-109
7-110
L/2 L/2
7-111
D
0.120
0.06
P
= 0.30
32
3413
87.9
E
0.160
0.08
P
= 0.40
36
4320
92.6
7-112
x (mm) h (mm) S (mm3)
M = M/S P for d = 19.0 MPa
0 20 1333 0 0 –
40 28 2613 20P P/130.7 2483 N
7-113
Point
x
(m)
M (kN m)
h
(mm)
S
(mm
3
)
(MPa)
A
0
0
20
1333
0
B
0.040
0.20
P
= 0.10
24
1920
52.1
C
0.080
0.04
P
= 0.20
28
2613
76.5
(MPa)
x (mm)
80
60
40
h
x
= 20 + 0.1
x
For x 200
L/2 L/2
P
7-114
0
7-115
0
2500 lb
2500 lb
2 ft 4 ft
C
B
2.5 K/ft
15 K
7-116
,
7-117 ;
7-118
h
76
e’
Q
7-119
t c’ d’ Ix b; h
e (mm); t/2
0.50 37.5 75.0 71 731 37.75; 75.5 14.16; 13.91
7-120
7-121
t h; c b c/h b/h; e/h e;
0.020
1.98; 0.5100 1.980
0.258 1.00; 0.48 0.950; 0.940
7-122
7-123
t h; c b c/h b/h; e/h e;
0.50 79.5; 19.75 49.5 0.248 0.623; 0.38 30.2; 30.0
7-124
7-125
7-126
R
t
= 0.13 in
Q
7-127
7-128
7-129
7-130
7-131
7-132
7-133
P P
0.8 m
7-134
7-135
7-136
Part A; y A y I d; Ad2 I + Ad2
1 3 Ribs 18 750; 62.5 1.17×106 24.4×106 75; 105.5×106 129.5×106
R
M
3000 N 3000 N
Step
50 50
Groove
50 50
Step
50 50
V
7-137 ;
M
M
= 2.4
P
7-138
7-139
7-141
P
P
P
P
0.8 m
Typical
Total length = 8.0 m
2P
V
0
2
P
A B C D E F G
R = 3000 N
7-142 :
7-143 ]
7-144
A
B
C
D
E
20 K
15
K
4 K/ft
A B C D E
500 N
600 N
12 kN 15 kN
2.6 m
V
8 kN/m
7-145
7-146
141 000
7-147
7-148
25 lb/in
3200 lb
0
60 in
60 in
1200 1200 lb
45 in 45 in
F
36 in
M = 36(F)
7-149
,
7-150
7-151 ]
4
6 4
30 in 20 in
50 in
6750 lb 5800 lb
(lb in) 0
:
7-152