International Research Journal of Engineering and Technology (IRJET) Volume: 04 Issue: 02 | Feb -2017
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e-ISSN: 2395 -0056 p-ISSN: 2395-0072
DESIGN AND ANALYSIS FOR SUPPORTING SYSTEM OF CIRCULAR ESR FOR DIFFERENT SEISMIC ZONE FOR SAME CAPACITY . Shahid Arshad1, Irfan Y. Khan2, Nikhil Gajbhiye3, Aehetesham Sheikh4 Assistant professor, Dept. of Civil Engineering, Anjuman College of engineering and technology, Maharashtra, India 2Student of Graduation, Dept. of Civil Engineering, Anjuman College of engineering and technology, Maharashtra, India 3 Student of Graduation, Dept. of Civil Engineering, Anjuman College of engineering and technology, Maharashtra, India 4Student of Graduation, Dept. of Civil Engineering, Anjuman College of engineering and technology, Maharashtra, India ---------------------------------------------------------------------***--------------------------------------------------------------------1
Abstract - Water tanks are very important for public
utility and for industrial structure. As we know elevated water tanks were heavily damages or collapsed during earthquake. This was might be due to the lack of knowledge regarding the proper behaviour of supporting system of the tank against seismic effect and also due to improper geometrical selection of staging patterns . The study describes, design and analysis of supporting system of circular elevated water tanks having same capacity for different seismic zone ( II , III and IV ) . Shear force, Seismic Axial force , and seismic bending moment are calculated under each column by response spectrum method and compared for different seismic zone under peripheral and interior column of supporting system or staging .
Key Words: Circular overhead tank, Staging system, R.S.M. , Bending Moment, seismic axial force, Shear Force, different zones.
1. INTRODUCTION: Water is essential to humans and
other 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 pressurization the water distribution system. Many new ideas and innovation has been made for the storage of water and other liquid materials in different forms and fashions. There are many different ways for the storage of liquid such as underground, ground supported, elevated etc. Liquid storage tanks are used extensively by municipalities and industries for storing water, inflammable liquids and other chemicals. Thus Water tanks are very important for public utility and for industrial structure. 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 economical © 2017, IRJET
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Impact Factor value: 5.181
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loss. Since, the elevated tanks are frequently used in seismic active regions. Also hence seismic behaviour 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 damages. 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. The 3-D model of ESR is draft on AUTOCAD . The main aim of present study is to understand the behavior of staging for the same capacity of ESR for different seismic zone .
1.1. OBJECTIVES: The followings are the main objectives of present study. To make a study about the analysis and design of elevated water tank. To know the design philosophy for the safe design of water tank. Understanding the behaviour of staging when tank is in full and empty condition. Comparison of seismic forces and seismic moments induced under peripheral and interior column of staging for different seismic zones.
2. TANK DATA AND MODELLING In the present study the capacity of tank is considered as 300m3 . The external diameter of tank is 9.8m. In full tank condition, the water level is 4.6m and free board is taken as 0.3. Circular column is considered of diameter 0.5m. The tank container is of circular type. Young’s modulus and the weight of concrete per unit volume are taken as 25000MPa and 25kN/m3 .The container is filled with water of density 1000 kg/m3. Grade of concrete is M25. Grade of steel Fe415. SBC of soil is 130kN/m2 (medium soil).
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