139 OF ENGINEERING FORMULÆ.
Strength and Weight of I STEEL Beams.
(Rolled by the Société John Cockerill, Belgium.)
The loads are calculated on a resistance of
14,000 lbs. (6| tons) per square inch. The loads
being distributed and the beam supported at both
ends. Half the load must be taken if concentrated
at the cen-tre.
Dimensions, inches. Weight, lbs. per foot run.. Load in cwt. for Spans of
Depth Flange Web. 6 feet. 10 feet. 15 feet. 20 feet 26 feet. 30 feet.
it Ö fl
3} J 2 3 7-10 39-6 19-8 13-2 9-9 7-9 6-6
41i 2 i 8’50 52-1 26-1 17-4 13-0 10-4 8-7
5$ 2 i 9'20 69-4 34'7 23-1 17-3 13-9 11-6
1?« J, 4'10 17-2 8-6 5-7 4-3 3-4 2’9
5 2rf i 12-10 95-4 47-7 31-8 23-8 19'1 15-9
2i I 12-10 100-7 50-4 33'6 25'1 20’0 16-9
6iff 3i 16'30 155’3 77-6 51'8 38'8 31-1 25'9
3.j t 18-30 187’6 93’8 62’5 46'9 37’5 31-3
4 2,«T 16'30 168-2 84-1 56'1 42'1 33-7 28-0
8f 2f 5 _ 17-50 204*4 102-0 68-1 51'1 40'9 34-1
Vu 3« ♦ 21-20 227-4 113'7 75-8 56-8 45'5 38-3
Fibe-proof Floors.
French System with Wrougbt-iron Rolled Beams.
Length of Bearing. Depth of Joist. Depth of Floor complete. Weight per Square.
inches. inches. lbs.
10 to Hi 4 U 370
iiito 13 44 U 420
13 to 16 8f 465
16 to 20 6| 9; 510
20 to 23 io; 605
23 to 26 Hi Ilf 700