| 156 | DE PONTIBUS |
| of rolled I beams, and on shapes in body of suspenders, hip verticals and hanger-plates (there being 50 per cent increase of net area for section through eyes) | 14,000 pounds. |
| Tension on adjustable truss members of wrought iron | 13,000 " |
| Bending on pins | 27,000 " |
| Bearing on pins and rivets (measured upon the projection of the semi-intrados upon a diametral plane) | 22,000 " |
| Shear on pins | 15,000 " |
| Shear on rivets | 12,000 " |
| Shear on webs of plate girders | 10,000 " |
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For field-rivets the intensities for bearing and shear are to be reduced twenty (20) per cent. |
| Compression on top chords |  |
| Compression on inclined end posts |  |
| Compression on all other struts with fixed ends |  |
| Compression on all other struts with one or two hinged ends |  |
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where l is the unsupported length of the strut in inches and r is its least radius of gyration in inches. |
| Compression on end stiffeners of plate girders. | 14,000 pounds. |
| Tension on extreme fibres of long leaf, Southern, yellow-pine timber in bending, the effect of impact being considered | 2000 " |
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BEARINGS UPON MASONRY.All bed plates must be of such dimensions that the greatest pressures on the masonry, including impact, shall not exceed those given in the following table:
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