Project 1

A residential society has 200 x 2BHK flats and 100 x 3BHK flats. A typical family in a 2BHK flat has 3 persons/flat and a 3BHK flat has 4 persons/flat. The gross water demand (per person per day in liters) can be calculated by taking the aggregate of the usage for all the below listed activities.

Activities	Consumption (per person/day in litres)
Drinking	5
Cooking	45
Bathing	30
Toilet Flushing	25
Cloth Washing	35
Miscellaneous use	10

Constraints & Site Data:

• One of the dimensions of the underground water tank is limited by the width of the internal road in the residential society as this is the ideal location of an underground water tank in case of a fire emergency. The width of the road could be taken as 6 meters and thus the width dimension of the tank cannot exceed 6 meters.
• The bearing capacity of the soil at different founding depths is given in the table belo

Founding Depth (Below F.G.L)	S.B.C (Tonnes/sqm)
-3.00 m LVL	7.5
-4.00 m LVL	8
-5.00 M LVL	8.5

Consider an allowable soil settlement of 25 mm under the base slab.

• The top cover slab thickness is 500mm for a maximum one-way direction span of 4 meters. Use a structural beam of dimensions 500 x 900 (min concrete grade M25) if the span of the top slab exceeds 4 meters in order to break the span. Note that the beam and the top slab doesn’t need to be designed under current problem statement.

Loadings:

• For the top cover slab, the maximum live load to be assumed is 15 kN/m2 and a maximum superimposed dead load is 3 kN/m2.
• Consider unit weight of soil 18 kN/m3 and unit weight of water 10 kNm3. The soil needs to be considered in a saturated state.

Create a full-scaled 3D STAAD pro model of the underground water tank complying with the calculated demand, site constraints and the best practice guidelines for FEA. The final model should consist of all the applicable loadings on the structure, support conditions, material specifications and an average mesh size of 500 mm. The modelling of the entire geometry shall be based on center line approach and the model should be devoid of any errors or warnings.

One of the dimensions of the underground water tank is limited by the width of the internal road in the residential society as this is the ideal location of an underground water tank in case of a fire emergency. The width of the road could be taken as 6 meters and thus the width dimension of the tank cannot exceed 6 meters.

For the top cover slab, the maximum live load to be assumed is 15 kN/m2 and a maximum superimposed dead load is 3 kN/m2.

Consider unit weight of soil 18 kN/m3 and unit weight of water 10 kNm3. The soil needs to be considered in a saturated state.

Create a full-scaled 3D STAAD pro model of the underground water tank complying with the calculated demand, site constraints and the best practice guidelines for FEA. The final model should consist of all the applicable loadings on the structure, support conditions.