COMPARATIVE STUDY ON DESIGN OF CYLINDRICAL WATER TANKS WITH VARYING ASPECT RATIOS

Abstract

Safe drinking water is one of the basic elements for humans to sustain healthy life. Reinforced concrete overhead water tanks are widely used to provide the safe drinking water. Most water supply systems in developing countries, such as India, where urbanizing is increasing day by day rely on overhead storage tanks and hence there is need to construct more number of water tanks. Earlier design of water tanks was being done using the working stress method given in IS: 3370 1965. This method leads to thicker and heavily reinforced sections. The use of limit state method of design has been adopted in the revised code IS 3370: 2009 and provision for checking the crack width is also included in this code. This study is carried out to analyze the cost of overhead water tanks of a fixed capacity, having different heights and diameters so as to determine the most economical H/D ratio to be adopted in the design of the tank. This will help the designers in making the choice for their design. To optimize the results and check the accuracy of design, six circular water tanks of 350 kL, with top and bottom dome pattern were designed by varying H/D ratio from 0.50 to 0.75 in STAAD.Pro. After assuring the safety of all the structures, further analysis is done to calculate the cost effectiveness of the structures by comparing the approximate total cost of materials.