International Journal of Research in Advent Technology, Vol.2, No.8, August 2014 E-ISSN: 2321-9637
Comparative Study of Water Tank Using Limit State Method and Working Stress Method Miss. Neeta K. Meshram1,Dr. P.S.Pajgade2 M.E. student, Dept. of Civil Engineering1,PRMITR,Badnera,Amravati, Maharashtra state, India1 Professor of civil Engg2.,PRMITR,Badnera,Amravati, Maharashtra state, India2 Email:Neetameshram17feb@gmail.com1, ppajgade@gmail.com2 Abstract: Water tanks are liquid storage containers. These containers are used for storing water. Water tanks are traditionally designed by working stress method. As per revised IS 3370 water tank can also be designed by limit state method .In this dissertation water tanks are designed by both working stress method and limit state method. Circular and square water tank are considered .Detailed analysis and design is done. Working drawings are prepared for all conditions. For understanding the financial implications quantities for concrete and steel were calculated. Exact amount of steel required is calculated for each case as per working drawings. It was observed that in case of limit state design cost required is less. Obviously circular water tank is more economical compare to square tank. Index Terms-Water tanks, working stress, limit state.
1. INTRODUCTION: Water tank are liquid storage containers. These containers are usually storing water for human consumption. The need for water tank systems is as old as civilized man. A ground water tank provides for the storage of drinking water, irrigation, fire suppression, agricultural farming and livestock, chemical manufacturing, food preparation, rainwater harvesting as well as many other possible solutions. The common materials used for the construction of water tank are concrete, steel and masonry. RCC is commonly used in construction because it is supposed to be durable material giving long maintenance free service. In general, service reservoirs can be classified;
between floor and wall are of two types i.e. flexible joint between floor and wall and second rigid joint between floor and wall. Method of Analysis and Design – The behavior of walls of water tank is more complex. They need sophisticated methods of analysis. For cylindrical tank, bending theory of cylinder with different edge conditions is required. For square tanks, plate theory with approximate boundary conditions at the four edges gives better results.IS3370 gives the design tables to pick up moment and shear coefficients for the design of cylindrical as well as square walls.
Ground service reservoir
In this paper following code are used : 1) IS 3370 part 1&2:2009 is the Indian code of practice for Concrete structure for the storage of liquids. 2) IS 456 : 2000 3) IS 3370:1965 Part IV – Design tables To avoid leakage problems IS 456 guide lines shouldbe used, which is based on working stress method. The strength and imperviousness achieved by using richer concrete mix say M25 and M30. Give a minimum clear cover of 40 mm, provide smaller diameter bars at closer intervals, keep the tensile
a) b) c)
Cylindrical service reservoir Rectangular service reservoir Square service reservoir
1.1 Ground Service Reservoir – Reservoir is common term applied to liquid storage structure and it can be below or above the ground level. They have circular, rectangular and squaresections with flat bottom slab. The joint
1.2 Design Requirement–
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