Keywords: axially symmetric cylindrical walls, reinforced concrete, post-tensioning forces, cost comparison..

Axially symmetric cylindrical walls are mostly used for storage water tanks. The strength against external loads and serviceability are the main parameters that must be satisfied during the design procedure. Because of their usage, the serviceability requirements are very important for this type of structure. For example, the crack width must be limited in order to avoid leakage and provide serviceability of the container. According to the expression described in the ACI 318 code, crack width can be limited by increasing wall thickness, arranging the distribution of the reinforcement bars or changing material properties. However in some cases, the limitation of crack width within the desired range cannot provide physical or economical solutions such as very large wall thicknesses, large reinforcement bar diameters inert alia. In that situation, post-tension systems can be a suitable solution. In this paper, cost comparisons of axially symmetric cylindrical reinforced concrete walls with and without post tensioning forces are presented. The total material cost of the wall includes the concrete, reinforcing bars, post-tensioning cables (shipping and application costs) and formwork. The analyses of the wall were completed using the superposition method.

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