矩形結構管材的尺寸與特性（1）
|
尺 寸 |
特 性** |
|
公稱*尺寸 |
壁厚 |
每英尺重量 |
截面積 |
X-X軸 |
Y-Y軸 |
|
Ix |
Sx |
rx |
Iy |
Sy |
ry |
|
ln. |
ln. |
Lb. |
ln.2 |
ln.4 |
ln.3 |
ln. |
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 |
|
.3750 |
3/8 |
47.90 |
14.1 |
382 |
47.8 |
5.21 |
40.4 |
20.2 |
1.69 |
|
.3125 |
5/16 |
40.35 |
11.9 |
327 |
40.9 |
5.25 |
35.1 |
17.6 |
1.72 |
|
14×10 |
.5000 |
1/2 |
76.07 |
22.4 |
608 |
86.9 |
5.22 |
361 |
72.3 |
4.02 |
|
.3750 |
3/8 |
58.10 |
17.1 |
476 |
68.0 |
5.28 |
284 |
56.8 |
4.08 |
|
.3125 |
5/16 |
48.86 |
14.4 |
405 |
57.9 |
5.31 |
242 |
48.4 |
4.11 |
*指平直邊的外部尺寸
**特性是根據外圓角公稱半徑等于壁厚的兩倍計算的。
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