Introduction
Water is human's basic need for life. Sufficient water distribution depends on design of a water tank in certain area. An elevated water tank is a large water storage container constructed for the purpose of holding water supply at certain height to pressurize the water distribution system.. A large number of overhead water tanks damaged during past earthquake. Majority of them were shaft staging while a few were on frame staging type elevated water tanks consist of huge water mass at the top of a slender staging which are most critical consideration for the failure of the tank during earthquakes. Elevated water tanks are critical and strategic structures and damage of these structures during earthquakes may endanger drinking water supply, cause to fail in preventing large fires and substantial economic loss. Since, the elevated tanks are frequently used in seismic active regions also hence, seismic behavior of them has to be investigated in detail .Due to the lack of knowledge of supporting system some of the water tank were collapsed or heavily damaged. So there is need to focus on seismic safety of lifeline structure using with respect to alternate supporting system which are safe during earthquake and also take more design forces.Design of new tanks and safety evaluation of existing tanks should be carried out with a high level of accuracy because the failure of such structures, particularly during an earthquake, may be disastrous. Hydrodynamic pressures on tanks under earthquake forces play an important role in the design of the tank. Earthquake can induce large horizontal and overturning forces in elevated water tanks. Such tanks are quite vulnerable to damage in earthquakes due to their basic configuration involving large mass concentrated at top with relatively slender supporting system. When the tank is in full condition, earthquake forces almost govern the design of these structures in zones of high seismic activity. It is important to ensure that the essential requirement such as water supply is not damaged during earthquakes. In extreme cases, total collapse of tanks shall be avoided. However, some repairable damage may be acceptable during shaking not affecting the functionality of the tanks. Severe damages were observed in buildings, public utility structures like water tanks and hospitals during 26th January 2001 Bhuj earthquake.
Lots of research has been made in two mass model of elevated service reservoir and hydrodynamic analysis of the container. It has also been observed that a well-designed and well-constructed water tank. Elevated liquid tanks and particularly the elevated water tanks are considered as an important city services in the many flat areas, and accordingly, their serviceability performance during and after strong earthquakes is of crucial concern. The failure of these structures may cause some hazards for the health of the citizens due to the shortage of water or difficulty in putting out fire during the earthquake time. Although many studies have been done on analysis and design of ground water tanks in the past decade, only a few studies have been conducted on the elevated water tanks. The performance of elevated water tanks during earthquakes is of much interest to engineers, not only because of the importance of these tanks in controlling fires, but also because the simple structure of an elevated tank is relatively easy to analyze and, hence, the study of tanks can be informative as to the behavior of structures during earthquakes.
II.
Objective of the study 
III. Types of bracing system used
Models are used for calculating base shear and nodal displacements for staging without diagonal bracing, staging with cross bracing , staging with chevron bracing , staging with diagonal bracing , staging with k-type bracing , staging with v-type bracing and alternate cross bracing in staging , alternate chevron bracing in staging , alternate k-type bracing in staging , alternate v-type bracing in staging., alternate diagonal bracing in staging, alternate diagonal bracing in both direction, alternate cross bracing in both direction.
IV.
STAAD pro.v8i
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Parameters of elevated water tank
SN Parameters values
(1) (2) (3) 
V. Results
Base shear of different bracing system Figure5.6: Bar chart of displacement of node 71 for different bracing system for half condition of tank in X direction.
Table no 5.6: Displacement of node 71 for different bracing system for half tank condition for node no 71 in X direction. Figure5.9: Bar chart of displacement of node 51 for different bracing system for full condition of tank in X direction. 

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