36 Page 36-45 © MAT Journals 2019. All Rights Reserved Journal of Structural Technology e-ISSN: 2581-950X Volume 4 Issue 3 Comparative Analysis of Circular and Rectangular Elevated Water Storage Tank Using Different Types of Bracing System Sagar T Mane* 1 , Prashant M Kulkarni 2 1 PG Student, 2 Professor Department of Civil Engineering, Trinity College of Engineering and Research, Pune, Maharashtra, India Email: * sagarmane5151@gmail.com DOI: Abstract Elevated water tank is a water storage facility supported by a tower and built at an elevation to give helpful capacity and pressure to a water distribution framework. The height of the elevated storage tank gives the pressure to the water supply framework. It has substantial mass assembled at the highest point of slim supporting structure and subsequently to an extremely weak against horizontal force because of earthquake. Elevated water tanks are important part of a lifeline system. Due to post earthquake useful desires, seismic safety of water tanks is most important. In the current study time history analysis of rectangular and circular elevated water storage tank was analyzed using SAP 2000 software. In this study the different types of bracing systems like single diagonal bracing, X-bracing, V-bracing, chevron bracing and baffle wall are used. As per IS 800:2007 provision K-bracing shall not be permitted in system to resist earthquake. The tank responses such as maximum nodal displacement, base shear and outcome have been in comparison for empty as soon as full tank water fills condition. From IS 11682:1985 provision when seismic loading is considered only two cases may be taken one is tank empty condition and other is tank full condition. Eventually, study discloses the importance of suitable assisting bracing configuration procedure to stay face against heavy damages of circular and rectangular elevated water storage tanks during earthquake as well as hydrodynamic pressure for impulsive and convective mode was calculated as per IITK-GSDMA recommendations for seismic design of liquid storage tanks. Keywords: Bracing system, elevated water tanks, SAP 2000, time history analysis INTRODUCTION Water tanks are very important for open utility and for modern structure, numerous new thoughts and development has been made for the capacity of water in various structures and forms. In general, there are three types of water tanks, namely a water tank placed on the ground, an underground tank and a raised tank. The side walls and base of the floor slab is under pressure due to the weight of the water. From the point of view of configuration perspective, the tank can be named according to its shape as a rectangular tank, circular tank, intze type tank. This elevated tank has various types of supporting structures such as RC shafts, RC reinforced frames, steel frames and stone pedestals. According to the seismic code IS: 1893 (Part I): 2016, Most of the area in India is prone to earthquake. The seismic design of a liquid storage tank requires knowledge of the hydrodynamic pressure distribution on the wall, producing the force and moment and accumulation of fluid contained. The freeboard is generally intended to allow liquids to flow freely inside to prevent a sloshing impact on the roof of the tank. The elevated water tank is a huge water storage container developed to hold water