concentrated load on old floor
concentrated load on old floor
(OP)
Hi, am looking for some advice concerning how to spread a concentrated load onto the ornately marble tiled floor of a ballroom in a Stately Home (it's an expensive floor!). The loading is from a tree (not a Christmas Tree ! ) which is to be temporarily erected on the floor for the purposes of filming a particular scene in a TV Drama. The tree weighs 4 tons. My initial thoughts are to use a steel I section, probable a 203/203/46UC seated on the floor and extending a width in the order of 4 metres to correspond with the spacing of the support beams beneath the floor. The concern I have is that there would still be a concentrated load beneath the center of the beam, as the beam attempts to defect under the load. Is there any easy way of determining the nature of support pressures beneath the spreader beam. Thanks, Tom






RE: concentrated load on old floor
RE: concentrated load on old floor
That way, as the spreader beams are loaded they would deflect downward a known amount - but never touch the marble tile. And all the load would go directly onto the floor beams (through the tile in direct bearing) and this would minimize the flex in the floor slab - possibly minimizing stress in the tile.
There would still be deflection in the main floor beams and you would have to analyze those to see if their deflection would be within limits to avoid cracking the tile.
RE: concentrated load on old floor
RE: concentrated load on old floor
RE: concentrated load on old floor
Mike McCann
MMC Engineering
RE: concentrated load on old floor
RE: concentrated load on old floor
If the steel beam was to be supported clear of the floor, spanning across two main beams, load will obviously be applied somewhere. Even if it could be shown that any existing main beams could support the load without undue deflection (whatever value is taken for that - who knows?), the bedding of the marble will be an unknown quantity.
Make sure your PI is up-to-date.
RE: concentrated load on old floor
Also, the excess on my PI would be greater than the fee I would receive. Have decided therefore to say that I can provide a scheme such that the floor does not collapse, but that I an unable to guarantee that the marble tiles could not possible crack. Again, thanks.
RE: concentrated load on old floor
RE: concentrated load on old floor