## checker plate floor loading

## checker plate floor loading

(OP)

Existing 1/4" thick steel checker plate floor is under scrutiny. I'm having difficulty finding a method to determine the maximum allowable concentrated load. A typical plate is rectangular and simply supported on four sides, is removable so not fastened to supports. The load is gravitational so is perpendicular to the plane of the plate. The plates vary in size but an example would be 3 feet by 4 feet. Any thoughts?

## RE: checker plate floor loading

Personally, I'd use the "Floor Plate Bending Capacity" tables in the Steel manual, and calculate the equivalent point load from the moment the uniform load would create.

Page 2-145 in the 9

^{th}Ed.Pages 3-154 & 155 in the 13

^{th}Ed.Hope it helps

## RE: checker plate floor loading

## RE: checker plate floor loading

a=4 b =3. b/a = 1.33 Beta = 0.74 Alpha = 0.0093

Max def = alpha x W x b x b / ( E x t x t x t)

Max stress = (3W /(2 x pi x t x t)) x ((1 + poison ratio) x

ln(2b/pi x r'o) + Beta))

r'o = sqrt (1.6 ro x ro + t x t).

ro = radius of load contact

## RE: checker plate floor loading

My 5th Edition Table 25 shows:

alpha=.1478 at a/b=1.2

alpha=.1621 at a/b=1.4

## RE: checker plate floor loading

If I remember correctly, don't the building codes define what a "concentrated load" is? It's not a point load, it's something like 2' square (ie, space a person occupies) and that will make a sizable difference in your case. And that would put you closer to formula 1c rather than 1b in Roark's book.

## RE: checker plate floor loading

## RE: checker plate floor loading

## RE: checker plate floor loading

## RE: checker plate floor loading

Unless otherwise specified, the indicated concentration shall be assumed to be uniformly distributed over an area 2.5 ft square and shall be located so as to produce the maximum load effects in the structural members." My particular situation falls under "otherwise specified". It is, however, good to know for other cases.## RE: checker plate floor loading

## RE: checker plate floor loading

prex

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