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Design of rcc rectangular water tank resting on ground
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In water retaining structure a dense impermeable concrete is required therefore, proportion of fine and course aggregates to cement should be such as to give high quality concrete. Concrete mix weaker than M20 is not used. The minimum quantity of cement in the concrete mix shall be not less than 30 kN/m 3 . The design of the concrete mix shall be such that the resultant concrete is sufficiently impervious. Efficient compaction preferably by vibration is essential. The permeability of the thoroughly compacted concrete is dependent on water cement ratio. Increase in water cement ratio increases permeability, while concrete with low water cement ratio is difficult to compact. Other causes of leakage in concrete are defects such as segregation and honey combing. All joints should be made water-tight as these are potential sources of leakage. Design of liquid retaining structure is different from ordinary R.C.C, structures as it requires that concrete should not crack and hence tensile stresses in concrete should be within permissible limits. A reinforced concrete member of liquid retaining structure is designed on the usual principles ignoring tensile resistance of concrete in bending. Additionally it should be ensured that tensile stress on the liquid retaining face of the equivalent concrete section does not exceed the permissible tensile strength of concrete as given in table 1. For calculation purposes the cover is also taken into concrete area. Cracking may be caused due to restraint to shrinkage, expansion and contraction of concrete due to temperature or shrinkage and swelling due to moisture effects. Such restraint may be caused by ñ (i) The interaction between reinforcement and concrete during shrinkage due to drying. (ii) The boundary conditions. (iii) The differential conditions prevailing through the large thickness of massive concrete • Use of small size bars placed properly, leads to closer cracks but of smaller width. The risk of cracking due to temperature and shrinkage effects may be minimized by limiting the changes in moisture content and temperature to which the structure as a whole is subjected. The risk of cracking can also be minimized by reducing the restraint on the free expansion of the structure with long walls or slab founded at or below ground level, restraint can be minimized by the provision of a sliding layer. 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. In case length of structure is large it should be subdivided into suitable lengths separated by movement joints, especially where sections are changed the movement joints should be provided. Where structures have to store hot liquids, stresses caused by difference in temperature between inside and outside of the reservoir should be taken into account. The coefficient of expansion due to temperature change is taken as 11 x 10 -6 /° C and coefficient of shrinkage may be taken as 450 x 10 -6 for initial shrinkage and 200 x 10 -6 for drying shrinkage. • Real civil • / @realcivil • • after watching video you will be able to • 1. Design Of Water Tank • 2. Analysis Design of Rectangular Water Tanks - Solved Example • 3. Design of water tank | basic rule for water tank design, overhead tank design in Hindi • 4. Water Tank Design - How To Design A Water Tank • 5. Design of overhead rectangular water tank • • Our face book page : real civil : / civilnerd • Our telegram page : civil engineering video : https://t.me/realcivil • Instagram page link : https://instagram.com/real.civil?igsh... • #manualdesign • #watertank • #rccwatertank • #rectangularwatertank • • Design of rcc rectangular water tank resting on ground • • Design of rcc rectangular water tank ... • • Seismic analysis of elevated water tank as per is 1893 : manual calculation iitk nicee • • Seismic analysis of elevated water ta... • • Design of underground circular water tank with flexible base | is 3370 part 2 – 2009 • • Design of underground circular water ... • • design overhead rectangular tank : Design of rcc water tank : design of water tank in hindi • • overhead water tank design : Design o...
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