Example 6 1 Rectangular Water Tank Design – Free download as PDF File .pdf), Text File .txt) or read online for free. leakage. This project gives in brief, the theory behind the design of liquid retaining structure (Elevated circular water tank with domed roof and conical base). and further guidance on seismic design methods for storage tanks larger tanks, and as such the seismic design for these larger storage tanks.

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Load from bottom slab will be triangular as shown in Figm 17m23 a. This will automatically take care of failure due to cracking. It is desirable that longer side should not be greater than twice the smaller side. The width of the slab shall be determined in usual manner for calculation of the resistance to cracking of T-beam, L-beam sections at supports.

By completing the triangle of moments, the moments, the moments in the braces can be found. When steel and concrete are assumed to act together for checking the tensile stress in concrete for avoidance of crack, the tensile stress in steel will be limited by the requirement that the permissible tensile stress in the concrete is not exceeded so the tensile stress in steel shall be equal to the product of modular ratio of steel and concrete, and the corresponding allowable tensile stress in concrete.

Distribution steel will take direct tension. Knowing equation of elastic curve, values of P0 and Pr can be calculated. The tanks are supported on staging which consists of masonry tower or a number of columns braced together.

The walls of these tanks are subjected to pressure and the base is subjected to weight of water and pressure of soil. Earth pressure at base will be due to water pressure plus due to submerged weight of soil.


Same reinforcement is put at top and bottom as the may blow from one side or the other.

water tank design example | Ravindra Ranatunga Ranatunga –

This type of joint is provided between wall and floor r.c.c.ovverhead some cylindrical tank designs. For calculations relating to the resistance of members to cracking, the permissible stresses in tension direct and due to bending and shear shall confirm to the values specified in Table 1. And we are proud to be the one of the best people in the field of civil engineering.

Design of Long Walls. General Design for Requirements I. The tank is supported on masonry tower. Pressure of Saturated soil acting from outside and no water pressure from r.c.c.oerhead. In normal circumstances the screed layer shall be of grade not weaker than M tan, where injurious soils or aggressive water are expected, the screed layer shall be of grade not weaker than M and if necessary a sulphate resisting or other special cement should be used.

Oa is drawn perpendicular to OA and OB is drawn perpendicular to OB and ab is drawn at right angles to the direction of wind, ab gives moment in the column Oa and Ob will give the moments in braces OA and OB respectively. Meridional thrust per 1 cm. The dome shall be supported at its bottom on the ring beam which shall be designed for resultant circumferential tension in addition to vertical loads.

While designing walls of cylindrical tanks the following points should be borne in mind: This can be provided by founding the structure on a flat layer of concrete with interposition of some material to break the bond and facilitate movement.

The bottom slab will be treated as having edges clamped.

Base Slab Provide 15 cm. Maximum – ve B. Wate only our people but our clients are also proud of us. Though assumed that base is flexible, but in reality there will always be some restraint at the base and some pressure will be resisted by cantilever action of the wall. An estimate should be made of the proportion of the pressure resisted by bending moments in the vertical and horizontal planes. Circular tanks are sometimes provided with inclined ttank. Protection measure shall be provided to the underside of the roof to prevent it from corrosion due to condensation.


These conditions will give two equations. Roofs i Ddsign of Movement Joints. Stress limitations for liquid retaining faces shall also apply to: Thus four equations are obtained which can be solved for constants C1, C2, C3 and C4.

Overhead RCC Water Tanks Construction

Provide 4 bars of 32 mm. The direct horizontal tension caused by the direct pull due to water pressure on the end walls, should be added to that resulting from horizontal bending moments.

The tanks like purification tanks, Imhoff tanks, septic tanks, r.f.c.overhead gas holders are built underground. Reinforcement is curtailed in the same manner as in the second case. Desiign is a joint with complete discontinuity in both reinforcement and concrete and with special provision to facilitate movement in plane of the joint.

For short walls it is assumed 2 that end one wate width of long wall contributes to direct tension on the short walls. Minimum Cover to Reinforcement. The risk of cracking due to temperature and shrinkage effects may be minimised by limiting the changes in moisture content and temperature to which the structure as a whole is subjected.

LV 4 Assume 22 cm.