1964_BUILDING_(CONSTRUCTION)_REGULATIONS — Page 62

B 62

[Subsidiary]

L.N. 294/76.

CAP. 123] Building (Construction) Regulations

TABLE XXIV

[1985 Ed.

1

Maximum permissible axial stress on columns and struts in MPa

Steel complying with the appropriate provisions of-

2

Ratio l/r

BS 4360: 1972 Grade 43

BS 4360: 1972

3

Not exceeding 25 mm in thickness

Exceeding 25 mm in thickness

0 98 88 140 190 170 10 130 180 160 20 120 170 150 30 115 160 140 40 110 145 130 50 100 135 120 60 95 120 110 70 85 110 100 80 80 100 95 90 70 85 80 100 63 100 75 70 110 65 110 60 120 55 120 55 130 50 130 50 140 40 45 40 140 45 150 35 40 35 150 40 160 31 35 32 160 35 170 30 31 29 170 31 180 26 27 26 180 27 190 23 25 25 190 25 200 21 23 22 200 22 210 20 20 20 210 20 220 19 19 19 220 19 230 17 17 17 230 17 240 15 15 15 240 15 250 14 14 14 250 11 8 300 350

L.N. 294/76.

Note: The maximum permissible axial stress for intermediate values of l/r shall be obtained by interpolation between the 2 nearest stresses for the kind of steel used.

(3) For the purpose of calculating the maximum permissible axial stress on a column or strut where that column or strut-

(a) is of I-section;

(b) has a single web;

(c) does not exceed 750 mm in depth over plating where used;

(d) is solidly encased in concrete not inferior to that designated Grade IIIA in regulation 19:

(e) the minimum width of solid concrete encasing is at least equal to b + 100 mm, where b is the width of the steel flange in mm;