International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 07 | July -2017
p-ISSN: 2395-0072
www.irjet.net
"STUDY ON INFLUENCE OF INVERTED V AND W-FRAME COLUMN
SUPPORT ON DYNAMIC BEHAVIOUR OF HYPERBOLIC COOLING TOWER UNDER SEISMIC LOADING” Nandini M¹, Guruprasad T N² ¹ Post Graduate Student, Department of Civil Engineering, Shridevi Institute of Technology, Tumakuru, Karnataka, India.. ²Assistant Professor, Department of Civil Engineering, Shridevi Institute of Technology, Tumakuru, Karnataka, India ---------------------------------------------------------------------***---------------------------------------------------------------------
Abstract - Hyperbolic cooling tower is a structure its main
function is to cool down the water from different plants and removes the waste heat to the atmosphere with avoiding pollution to the environment. These cooling towers are used in various power plants such as nuclear, atomic, petrochemical, natural gas refineries etc.These are the very large structures with shell elements and columns at the base. In this present study the existing cooling tower of height 124.80mts is taken as reference tower. In this study the boundary condition taken is top end of the tower is free and bottom end of the tower is fixed condition. By varying different thicknesses along constant height with inverted V-frame and W-frame column support condition under seismic loading are modeled and method of finite element analysis is done using the software named SAP2000.From the analysis results the parameters like maximum stress, deflection and frequency of the different modes. Lastly the comparison for minimum thickness for both column supports and maximum thickness for both column supports are carried on. These values are tabulated and plotted in graphs and differences in them are noted and optimum cooling tower with suitable column supports are determined.
Key Words: cooling tower, V and W-frame column support, Seismic loads, SAP, Deflection.
1. INTRODUCTION Cooling tower is a part of the structure in the power plants which is used to remove the waste heat from the structure to the atmosphere by cooling the water stream in low temperature condition. The hyperbolic shaped cooling towers are commonly used in the nuclear power plants, petrochemical plants, thermal power plants, petroleum refineries, atomic power plants, natural gas processing plants, food processing plants etc. The cooling tower are huge structures which are greatly affected by wind and earthquake loads. The main purpose of working of cooling tower is to remove the heat from the water which is ejected by plants structures either by atmospheric air or by mechanical equipments and release the waste heated air or water of lower temperature to outside environment without causing any harm to the living bodies. As it is most © 2017, IRJET
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significant structure in thermal, nuclear and petrochemical plants, it should be frequently checked for the strength and stability under self-weight, and dynamic loads like wind load and earthquake load. Therefore, self-weight analysis, static method of wind analysis and both nonlinear and linear analysis under seismic loading of cooling tower with different column supporting systems are conducted for the analysis of cooling tower. The general working method of cooling tower is it may be natural draught or mechanical draught cooling tower, first the heated water from plants are pumped to the certain height depending upon the height of the cooling tower then they inlet to the pipes of nozzles and water is distributed in this way by system of piping. Then the water in the pipes are sprayed on the surfaces of fillers first the water sprays in the form of small droplets of water on surface then they flow in the way of pack of layers where either by atmospheric natural air or by mechanical equipments the water is exposed to air for more time and cooling of water takes place.
2. LITERATURE REVIEW T. Sithara et.al (2016), this paper deals with the effect of the static and dynamic loads on hyperboloid shape of shell structure. By taking an existing cooling tower of height 143.50 m from Bellary Thermal Power plant station. These towers are analyzed using ANSYS software. In analysis of method transient the post failure condition is possible where as in method of response spectrum it is not possible. so we can conclude that method of Transient analysis is better than Response spectrum analysis. C.R. Athira et.al (2016), in this paper the cooling tower performance is checked by varying parameters such as thickness and height of the tower shell and also to study the effect of these parameters on structural behavior of cooling tower. The modeling of the cooling tower is carried out by using the software STAAD.Pro and to analyze and design the cooling tower using the software SAP2000NL.From this we can conclude that Time history method of analysis gives the structural responses of the cooling towers more accurately than other methods of analysis.Ashok.P.Ponath et.al(2016), In this paper two existing cooling towers with different heights are analyzed. Both the towers have varying thickness throughout the height. ABAQUS 6.14 is used to analyze the cooling towers. ISO 9001:2008 Certified Journal
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