The total load per unit length of divisions shown in tables A 13-1 to table A 13-4 inclusive
may, if considered necessary, be assumed to have a trapezoidal distribution
with height. In such cases, the reaction loads at the upper and lower
ends of a vertical member or upright are not equal. The reaction loads
at the upper end expressed as percentages of the total load supported
by the vertical member or upright may be taken to be those shown in tables A 13-5 and A 13-6.
-
.1
Table A
13-5
Longitudinal divisions loaded on one side only
Bearing reaction at the upper end of upright as a percentage
of load from A 13.1
-
.2
Table A
13-6
Transverse divisions loaded on one side only
Bearing reaction at the upper end of upright as a percentage
of load from A 13.2
-
.3 The strength of the end connections of such
vertical members or uprights may be calculated on the basis of the
maximum load likely to be imposed at either end. These loads are as
follows:
| Longitudinal divisions
|
|
|
Maximum load
at the top
|
50% of the
appropriate total load from A
13.1
|
|
|
Maximum load
at the bottom
|
55% of the
appropriate total load from A
13.1
|
| Transverse divisions
|
|
|
Maximum
load at the top
|
45% of the
appropriate total load from A
13.2
|
|
|
Maximum
load at the bottom
|
60% of the
appropriate total load from A
13.2.
|
-
.4 The thickness of horizontal wooden boards may
also be determined having regard to the vertical distribution of the
loading represented by tables A 13-5 and A 13-6 and in such cases
- Where:
|
t
|
= |
thickness
of board in millimetres |
|
a
|
= |
horizontal
span of the board, i.e. distance between uprights in metres |
|
h
|
= |
head
of grain to the bottom of the division in metres |
|
p
|
= |
total
load per unit length derived from the tables in kilonewtons |
|
k
|
= |
factor
dependent upon vertical distribution of the loading. |
-
When the vertical distribution of the loading is assumed
to be uniform, i.e. rectangular, k shall be taken as
equal to 1.0. For a trapezoidal distribution
-
.5 Stays or shores
-
The sizes of stays and shores shall be so determined that
the loads derived from tables A 13-1 to
A 13-4 inclusive shall not exceed one third of the breaking loads.
|
B(m)
|
|
h(m)
|
2
|
3
|
4
|
5
|
6
|
7
|
8
|
10
|
| 1.50
|
8.336
|
8.826
|
9.905
|
12.013
|
14.710
|
17.358
|
20.202
|
25.939
|
| 2.00
|
13.631
|
14.759
|
16.769
|
19.466
|
22.506
|
25.546
|
28.733
|
35.206
|
| 2.50
|
19.466
|
21.182
|
23.830
|
26.870
|
30.303
|
33.686
|
37.265
|
44.473
|
| 3.00
|
25.644
|
27.900
|
30.891
|
34.323
|
38.099
|
41.874
|
45.797
|
53.740
|
| 3.50
|
31.823
|
34.568
|
37.952
|
41.727
|
45.895
|
50.014
|
54.329
|
63.008
|
| 4.00
|
38.148
|
41.286
|
45.013
|
49.180
|
53.691
|
58.202
|
62.861
|
72.275
|
| 4.50
|
44.473
|
47.955
|
52.073
|
56.584
|
61.488
|
66.342
|
71.392
|
81.542
|
| 5.00
|
50.847
|
54.623
|
59.134
|
64.037
|
69.284
|
74.531
|
79.924
|
90.810
|
| 6.00
|
63.498
|
68.009
|
73.256
|
78.894
|
84.877
|
90.859
|
96.988
|
109.344
|
|
h
|
= |
height of grain in metres from the bottom of the
division. When the cargo space is filled, the height (h)
shall be taken to the overhead deck in way of the division. In a
hatchway or where the distance from a division to a hatchway is
1 m or less, the height (h) shall be taken to the level
of the grain in the hatchway. |
|
B
|
= |
transverse extent of the bulk grain in metres. |
|
|
B/h
|
f
|
B/h
|
f
|
| 0.2
|
1.687
|
2.0
|
3.380
|
| 0.3
|
1.742
|
2.2
|
3.586
|
| 0.4
|
1.809
|
2.4
|
3.792
|
| 0.5
|
1.889
|
2.6
|
3.998
|
| 0.6
|
1.976
|
2.8
|
4.204
|
| 0.7
|
2.064
|
3.0
|
4.410
|
| 0.8
|
2.159
|
3.5
|
4.925
|
| 1.0
|
2.358
|
4.0
|
5.440
|
| 1.2
|
2.556
|
5.0
|
6.469
|
| 1.4
|
2.762
|
6.0
|
7.499
|
| 1.6
|
2.968
|
8.0
|
9.559
|
| 1.8
|
3.174
|
|
|
|
L(m)
|
|
h(m)
|
2
|
3
|
4
|
5
|
6
|
7
|
8
|
10
|
12
|
14
|
16
|
| 1.50
|
6.570
|
6.767
|
7.159
|
7.649
|
8.189
|
8.728
|
9.169
|
9.807
|
10.199
|
10.297
|
10.297
|
| 2.00
|
10.199
|
10.787
|
11.474
|
12.209
|
12.994
|
13.729
|
14.416
|
15.445
|
16.083
|
16.279
|
16.279
|
| 2.50
|
14.318
|
15.347
|
16.426
|
17.456
|
18.437
|
19.417
|
20.349
|
21.673
|
22.408
|
22.604
|
22.604
|
| 3.00
|
18.878
|
20.251
|
21.624
|
22.948
|
24.222
|
25.399
|
26.429
|
27.900
|
28.684
|
28.930
|
28.930
|
| 3.50
|
23.781
|
25.546
|
27.164
|
28.733
|
30.155
|
31.430
|
32.558
|
34.127
|
35.010
|
35.255
|
35.255
|
| 4.00
|
28.930
|
30.989
|
32.901
|
34.667
|
36.187
|
37.559
|
38.736
|
40.403
|
41.286
|
41.531
|
41.580
|
| 4.50
|
34.274
|
36.530
|
38.638
|
40.501
|
42.120
|
43.542
|
44.767
|
46.582
|
47.562
|
47.856
|
47.905
|
| 5.00
|
39.717
|
42.218
|
44.473
|
46.434
|
48.151
|
49.622
|
50.897
|
52.809
|
53.839
|
54.182
|
54.231
|
| 6.00
|
50.749
|
53.593
|
56.094
|
58.301
|
60.164
|
61.782
|
63.204
|
65.263
|
66.440
|
66.832
|
66.930
|
|
h
|
= |
height of grain in metres from the bottom of the
division. When the cargo space is filled, the height (h)
shall be taken to the overhead deck in way of the division. In a
hatchway, or where the distance from a division to a hatchway is
1 m or less, the height (h) shall be taken to the level
of the grain in the hatchway. |
|
L
|
= |
longitudinal extent of the bulk grain in
metres. |
|
|
L/h
|
f
|
L/h
|
f
|
| 0.2
|
1.334
|
2.0
|
1.846
|
| 0.3
|
1.395
|
2.2
|
1.853
|
| 0.4
|
1.444
|
2.4
|
1.857
|
| 0.5
|
1.489
|
2.6
|
1.859
|
| 0.6
|
1.532
|
2.8
|
1.859
|
| 0.7
|
1.571
|
3.0
|
1.859
|
| 0.8
|
1.606
|
3.5
|
1.859
|
| 1.0
|
1.671
|
4.0
|
1.859
|
| 1.2
|
1.725
|
5.0
|
1.859
|
| 1.4
|
1.769
|
6.0
|
1.859
|
| 1.6
|
1.803
|
8.0
|
1.859
|
| 1.8
|
1.829
|
|
|
|
B (m)
|
|
h(m)
|
2
|
3
|
4
|
5
|
6
|
7
|
8
|
10
|
| 1.5
|
43.3
|
45.1
|
45.9
|
46.2
|
46.2
|
46.2
|
46.2
|
46.2
|
| 2.0
|
44.5
|
46.7
|
47.6
|
47.8
|
47.8
|
47.8
|
47.8
|
47.8
|
| 2.5
|
45.4
|
47.6
|
48.6
|
48.8
|
48.8
|
48.8
|
48.8
|
48.8
|
| 3.0
|
46.0
|
48.3
|
49.2
|
49.4
|
49.4
|
49.4
|
49.4
|
49.4
|
| 3.5
|
46.5
|
48.8
|
49.7
|
49.8
|
49.8
|
49.8
|
49.8
|
49.8
|
| 4.0
|
47.0
|
49.1
|
49.9
|
50.1
|
50.1
|
50.1
|
50.1
|
50.1
|
| 4.5
|
47.4
|
49.4
|
50.1
|
50.2
|
50.2
|
50.2
|
50.2
|
50.2
|
| 5.0
|
47.7
|
49.4
|
50.1
|
50.2
|
50.2
|
50.2
|
50.2
|
50.2
|
| 6.0
|
47.9
|
49.5
|
50.1
|
50.2
|
50.2
|
50.2
|
50.2
|
50.2
|
| 7.0
|
47.9
|
49.5
|
50.1
|
50.2
|
50.2
|
50.2
|
50.2
|
50.2
|
| 8.0
|
47.9
|
49.5
|
50.1
|
50.2
|
50.2
|
50.2
|
50.2
|
50.2
|
| 9.0
|
47.9
|
49.5
|
50.1
|
50.2
|
50.2
|
50.2
|
50.2
|
50.2
|
| 10.0
|
47.9
|
49.5
|
50.1
|
50.2
|
50.2
|
50.2
|
50.2
|
50.2
|
|
B
|
= |
transverse extent of the bulk grain in metres. |
|
For other values of h or B the
reaction loads shall be determined by linear interpolation or extrapolation
as necessary.
|
L (m)
|
|
h(m)
|
2
|
3
|
4
|
5
|
6
|
7
|
8
|
10
|
12
|
14
|
16
|
| 1.5
|
37.3
|
38.7
|
39.7
|
40.6
|
41.4
|
42.1
|
42.6
|
43.6
|
44.3
|
44.8
|
45.0
|
| 2.0
|
39.6
|
40.6
|
41.4
|
42.1
|
42.7
|
43.1
|
43.6
|
44.3
|
44.7
|
45.0
|
45.2
|
| 2.5
|
41.0
|
41.8
|
42.5
|
43.0
|
43.5
|
43.8
|
44.2
|
44.7
|
45.0
|
45.2
|
45.2
|
| 3.0
|
42.1
|
42.8
|
43.3
|
43.8
|
44.2
|
44.5
|
44.7
|
45.0
|
45.2
|
45.3
|
45.3
|
| 3.5
|
42.9
|
43.5
|
43.9
|
44.3
|
44.6
|
44.8
|
45.0
|
45.2
|
45.3
|
45.3
|
45.3
|
| 4.0
|
43.5
|
44.0
|
44.4
|
44.7
|
44.9
|
45.0
|
45.2
|
45.4
|
45.4
|
45.4
|
45.4
|
| 5.0
|
43.9
|
44.3
|
44.6
|
44.8
|
45.0
|
45.2
|
45.3
|
45.5
|
45.5
|
45.5
|
45.5
|
| 6.0
|
44.2
|
44.5
|
44.8
|
45.0
|
45.2
|
45.3
|
45.4
|
45.6
|
45.6
|
45.6
|
45.6
|
| 7.0
|
44.3
|
44.6
|
44.9
|
45.1
|
45.3
|
45.4
|
45.5
|
45.6
|
45.6
|
45.6
|
45.6
|
| 8.0
|
44.3
|
44.6
|
44.9
|
45.1
|
45.3
|
45.4
|
45.5
|
45.6
|
45.6
|
45.6
|
45.6
|
| 9.0
|
44.3
|
44.6
|
44.9
|
45.1
|
45.3
|
45.4
|
45.5
|
45.6
|
45.6
|
45.6
|
45.6
|
| 10.0
|
44.3
|
44.6
|
44.9
|
45.1
|
45.3
|
45.4
|
45.5
|
45.6
|
45.6
|
45.6
|
45.6
|
|
L
|
= |
longitudinal extent of the bulk grain in metres. |
|
For other values of h or L the
reaction loads shall be determined by linear interpolation or extrapolation
as necessary.