International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 03 | Mar 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 3355 EARTHQUAKE ANALYSIS OF TALL STRUCTURE MOUNTED WITH TELECOMMUNICATION TOWER AT ROOFTOP Digambar Patil 1 , Nilesh Sargar 2 , Abhisehk Nannikar 3 , Akshay Mahajan 4 1,2,3 B.E Student, Department of Civil Engineering, SCT’s V.T.C., Miraj, Maharastra, India 4 Assistant Professor at V.T.C., Miraj, Maharastra, India ----------------------------------------------------------------------***--------------------------------------------------------------------- Abstract - In today’s world the telecommunication sector is growing dynamically and the trend of mobile communication is increasing rapidly day by day. A large proportion of world’s population lives in regions of seismic hazards, at risk from earthquakes of varying severity and frequency of occurrence. Earthquake causes significant loss of life and damage of property every year. Generally for telecommunication purpose, the four legged supporting tower are used widely. Due scarcity of land, there is a need of vertical expansion and this results in installation of telecommunication tower at rooftop of tall structure. As tower plays a vital role for wireless communication network, the failure of such tall structure mounted with telecommunication tower at roof top. During earthquake causes failure of such structure is major concern therefore utmost important has been given. The present study investigates severity of earthquake for Mumbai region. In this study; we have considered G+10 building and 5 different positions on rooftop for installation of telecommunication tower. We have compared tall structure mounted with telecommunication tower for various parameters such as displacement, storey shear, and storey drift and twisting moments. Design load that are given in software where compared along with manual calculation using IS 1893:2002. We used ETABS software for analysis. In different 5 cases we compared which is the ideal position and critical position for installation telecommunication tower using response spectrum method. Key Words: telecommunication tower, tall structure, rooftop, ETABS. 1. INTRODUCTION Communication plays a significant role in any generation. And this generation is widely using wireless communication which is supported by communication towers spread across the nations. As usage of cells is increasing very rapidly, few towers are installed at the higher elevation and few are installed at the tall structures or apartments for proper communication. As cities have scarcity of land and lack of open free spaces, there are many more towers which will be installed on the existing buildings for good service. Even though research says there is little effect of radiation around the tower, there is another effect which is not seen currently as a great threat and that is the effect of building response because of telecommunication tower installation on building rooftop. Telecommunication towers are tall structure usually designed for supporting parabolic antennas which are normally used for microwave transmission for communication, also used for sending radio, television signals to remote places and they are installed at specific height. These towers are self-supporting structures and categorized as three-legged and four-legged space trussed structures. The self-supporting towers are normally square or triangular in plan and are supported on ground or on building. They act as cantilever trusses and are designed to carry wind and seismic loads. These towers even though demand more steel but cover less base area, due to which they are suitable in many situations. Most of the studies performed on low rise building mounted with telecommunication tower. The studies related to tall structure mounted with 4-legged self-supporting towers are rare. The main objective of this study is to understand the change in behavior of existing structure after installation of telecommunication tower. 1.1 LITERATURE REVIEW Nitin Bhosale (2012) has carried out the seismic response of 4 legged telecommunication towers under the effect of design spectrum from the Indian code of practice for zone – IV. The axial forces of the tower member were considered and comparison between roof top mounted tower and tower supported at ground had been performed to find out the difference. Drisya S., (2016) has carried out the seismic analysis of low rise commercial building with roof top telecommunication tower with four different heights. Structure indicates that the position of tower on the host structure and its heights influence axial forces and stress in building members. Faria Aseem (2016) has carried out Effect of rooftop mounted telecommunication tower on design of the building structure. They concluded that the design of the columns get effected tremendously hence the telecommunication tower should not be installed on the building which are not designed for such loads. Arpit Chawda (2017) has carried out Seismic study of self- supporting telecommunication tower mounted on rooftop.