elevated swimming pool
elevated swimming pool
(OP)
I am trying to design an a swimming pool at second floor supported underneath by pretensioned/ PT beams.
ACI specifies to use to add 1.4 X F ( water load) to every load combination with live load.
-wht live load should I use ( the people swimming ??) how much??
- do I have to consider impact load ( a person jumping to the pool?? if yes , how do I distribute that
- if i have to consider siesmic on my load combination do I have to add the water load with the dead load ...
- any good reference book/code I can refer
I really appreciate for your much needed answer to my qstns?
Bennie
ACI specifies to use to add 1.4 X F ( water load) to every load combination with live load.
-wht live load should I use ( the people swimming ??) how much??
- do I have to consider impact load ( a person jumping to the pool?? if yes , how do I distribute that
- if i have to consider siesmic on my load combination do I have to add the water load with the dead load ...
- any good reference book/code I can refer
I really appreciate for your much needed answer to my qstns?
Bennie






RE: elevated swimming pool
No impact.
seismic - sloshing water is an issue - but I'm not sure about those requirements -
RE: elevated swimming pool
In tank design, part of the fluid is assumed to act rigidly with the tank and part of it moves at a much slower period due to the sloshing (considering the sloshing is usually a reduction in loading, not an increase as might be expected).
The building codes also have some wording about tanks supported by buildings- check into those sections.
RE: elevated swimming pool
RE: elevated swimming pool
ACI 350.3 covers Seismic Design of Liquid Containing Concrete Structures.
I would ignore live load of swimmers, as people weigh less than water, and have the same beta factors, under ACI 350.
RE: elevated swimming pool
If the water level rises, but the pool does not overflow, the weight of the pool contents (again... water + people) will increase by an amount more or less equal to the weight of the people. This is true whether the people are standing up (touching bottom) or swimming (not touching bottom).
However if compare the weight of the water with the weight of the water + people the difference is small. You did not mention the size of the pool, hypothetically say that it is 60' x 20' x 5' (average depth). Weight of water = 374 kips.
Say that there are 50 people in the pool with an average weight of 160 pounds. Weight of people = 8 kips.
That 2% increase (if the water does not overflow) will be "lost in the shuffle" of your other calculations (this simple comparison ignores the weight of the pool / supporting structure).
I agree with the others to consider sloshing. Have never designed a swimming pool, but have designed foundations for tanks in a high seismic area. We used the American Petroleum Institute (API) codes as a guide - load consideration for sloshing was tremendous.
www.SlideRuleEra.net
RE: elevated swimming pool
RE: elevated swimming pool
RE: elevated swimming pool
It will not fall down using higher load factors or "durability" factors of ACI 350 but the owner may protest the added cost from the the code required minimums and engineering judgement is no protection to "errors or omissions" suits in a court
RE: elevated swimming pool
Every pool I've been in (I swim laps for exercize) has a spillover that limits the high water level. I was assuming this pool has such a device.
civilperson
Strength is not the rational for the durability factor of ACI 350. It's watertightness. The factor is introduced to limit crack widths under service loads.