Antiskid Ladder rungs
- Antiskid stair ladder also named ladder rungs, usually it has three typs:
two holes ladder rung, three holes ladder rungs and four holes ladder rungs.
Common data is as following
Common size: 48-3/4’’, 60 lengths
Pre-galvanized or HRP&O steel, 13 and 11 gauge
.125’’ aluminum
16 gauge 304 SS
Allowable safe load shown are concentrated at center of span on simple beam
2 holes ladder rungs
material | safe allowable concentrated load(lb.) | weight lb./ln.ft | |||
16”span | 18”span | 20”span | 24”span | ||
11ga steel | 664 | 590 | 531 | 443 | 1.5 |
13ga steel | 508 | 451 | 401 | 338 | 1.1 |
.125” aluminum | 471 | 418 | 377 | 314 | 0.5 |
16ga stainless steel | 345 | 306 | 276 | 230 | 0.8 |
3holes ladder rungs
material | safe allowable concentrated load(lb.) | weight lb./ln.ft | |||
16”span | 18”span | 20”span | 24”span | ||
11ga steel | 474 | 422 | 379 | 316 | 1.2 |
13ga steel | 375 | 334 | 300 | 250 | 0.9 |
.125 aluminum | 337 | 299 | 263 | 224 | 0.5 |
16ga stainless steel | 260 | 231 | 208 | * | 0.7 |
4 holes ladder rungs
material | safe allowable concentrated load(lb.) | weight lb./ln.ft | |||
16”span | 18”span | 20”span | 24”span | ||
11ga steel | 1138 | 1012 | 911 | 759 | 1.9 |
13ga | 862 | 766 | 689 | 574 | 1.4 |
.125alumium | 810 | 720 | 649 | 540 | 0.7 |
16ga steel | 580 | 516 | 464 | 387 | 1..1 |
Notes: These loads are based on simple beam calculation
The minimum safety factor=1.67
Maximum deflection does not exceed L/240
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