矩形结构管材的尺寸与特性（1）
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尺 寸
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特 性**
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|||||||||
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公称*尺寸
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壁厚
|
每英尺重量
|
截面积
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x-x轴
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y-y轴
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|||||
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ix
|
sx
|
rx
|
iy
|
sy
|
ry
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|||||
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ln.
|
ln.
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lb.
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ln.2
|
ln.4
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ln.3
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ln.
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ln.4
|
ln.3
|
ln.
|
|
|
20×12
|
.5000
|
1/2
|
103.30
|
30.4
|
1650
|
165
|
7.37
|
750
|
125.0
|
4.97
|
|
.3750
|
3/8
|
78.52
|
23.1
|
1280
|
128
|
7.44
|
583
|
97.2
|
5.03
|
|
|
.3125
|
5/16
|
65.87
|
19.4
|
1080
|
108
|
7.47
|
495
|
82.5
|
5.06
|
|
|
20×8
|
.5000
|
1/2
|
89.68
|
26.4
|
1270
|
127
|
6.94
|
300
|
75.1
|
3.38
|
|
.3750
|
3/8
|
68.31
|
20.1
|
988
|
98.8
|
7.02
|
236
|
59.1
|
3.43
|
|
|
.3125
|
5/16
|
57.36
|
16.9
|
838
|
83.8
|
7.05
|
202
|
50.4
|
3.46
|
|
|
20×4
|
.5000
|
1/2
|
76.07
|
22.4
|
889
|
88.9
|
6.31
|
61.6
|
30.8
|
1.66
|
|
.3750
|
3/8
|
58.10
|
17.1
|
699
|
69.9
|
6.40
|
50.3
|
25.1
|
1.72
|
|
|
.3125
|
5/16
|
48.86
|
14.4
|
596
|
59.6
|
6.44
|
43.7
|
21.8
|
1.74
|
|
|
18×6
|
.5000
|
1/2
|
76.07
|
22.4
|
818
|
90.9
|
6.05
|
141
|
47.2
|
2.52
|
|
.3750
|
3/8
|
58.10
|
17.1
|
641
|
71.3
|
6.13
|
113
|
37.6
|
2.57
|
|
|
.3125
|
5/16
|
48.86
|
14.4
|
546
|
60.7
|
6.17
|
97.0
|
32.3
|
2.60
|
|
|
16×12
|
.5000
|
1/2
|
89.68
|
26.4
|
962
|
120
|
6.04
|
618
|
103.0
|
4.84
|
|
.3750
|
3/8
|
68.31
|
20.1
|
748
|
93.5
|
6.11
|
482
|
80.3
|
4.90
|
|
|
.3125
|
5/16
|
57.36
|
16.9
|
635
|
79.4
|
6.14
|
409
|
68.2
|
4.93
|
|
|
16×8
|
.5000
|
1/2
|
76.07
|
22.4
|
722
|
90.2
|
5.68
|
244
|
61.0
|
3.30
|
|
.3750
|
3/8
|
58.10
|
17.1
|
565
|
70.6
|
5.75
|
193
|
48.2
|
3.36
|
|
|
.3125
|
5/16
|
48.86
|
14.4
|
481
|
60.1
|
5.79
|
165
|
41.2
|
3.39
|
|
|
16×4
|
.5000
|
1/2
|
62.46
|
18.4
|
481
|
60.2
|
5.12
|
49.3
|
24.6
|
1.64
|