A Non- Linear Dynamic Behaviour of Circular Elevated Water Tank for different levels of water under El-Centro Earthquake Excitation

Abstract

The Braced Elevated Water tanks which currently practicing in India are catastrophic if they were subjected to severe horizontal thrust like Earthquake. Water tanks are very important for storing and distribute water to the farther end of the user in the distribution system. Especially elevated water tanks have specific significance in storing and supplying water for maintaining suitable pressure for the reach of public houses and also for the industrial uses. Demand of water is day by day increasing because of increase in the population. The need of revision of water tanks with more precautions in design after proper analysis with extreme loads has to be made for the survival of human community.

In this paper, an Octagonal braced elevated water tank with 400 m3 has been designed and analysed with Time History Data of El Centro Earthquake with peak ground acceleration of 3.417 m/s2 and lasts for 53.76 sec for finding the response of the structure such as base shear, tank displacement, Max Bending Moment at the base of column under tank for Empty, Full and Half Full condition have been calculated and then results have been compared. For this study, Staad pro v8i software is used for design and analysis of water tank and compared results for all conditions of the tank.