IRJET- Earthquake Analysis of Tall Structure Mounted with Telecommunication Tower at Rooftop

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International Research Journal of Engineering and Technology (IRJET)e-ISSN: 2395-0056Volume: 06 Issue: 03 | Mar 2019p-ISSN: 2395-0072www.irjet.netEARTHQUAKE ANALYSIS…
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International Research Journal of Engineering and Technology (IRJET)e-ISSN: 2395-0056Volume: 06 Issue: 03 | Mar 2019p-ISSN: 2395-0072www.irjet.netEARTHQUAKE ANALYSIS OF TALL STRUCTURE MOUNTED WITH TELECOMMUNICATION TOWER AT ROOFTOP Digambar Patil1, Nilesh Sargar2, Abhisehk Nannikar3, Akshay Mahajan4 1,2,3B.EStudent, Department of Civil Engineering, SCT’s V.T.C., Miraj, Maharastra, India 4Assistant Professor at V.T.C., Miraj, Maharastra, India ----------------------------------------------------------------------***---------------------------------------------------------------------Abstract - In today’s world the telecommunication sector isTelecommunication 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.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.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.Key Words: telecommunication tower, tall structure, rooftop, ETABS.1. INTRODUCTIONDrisya 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.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.© 2019, IRJET|Impact Factor value: 7.211Faria 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 selfsupporting telecommunication tower mounted on rooftop.|ISO 9001:2008 Certified Journal|Page 3355International Research Journal of Engineering and Technology (IRJET)e-ISSN: 2395-0056Volume: 06 Issue: 03 | Mar 2019p-ISSN: 2395-0072www.irjet.netThey studied the behavior of roof top telecommunication tower when subjected to lateral loads.C. Plan OF building2. OBJECTIVES 1. To Analyses a G+10 Storey Structure by considering Roof mounted Tower. 2. To Compare the Behaviour of RCC Structure with and without Roof mounted Telecommunication Tower. 3. To locate ideal and critical position for construction of Roof mounted Telecommunication Tower. 4. To Enhance the Structural Stability of RCC Structure with Roof mounted Telecommunication Tower against Earthquake Forces.3. METHODOLOGY RESPONSE SPECTRUM METHOD- Response spectrum is one of the useful tools of earthquake engineering for analysing the performance of structures especially in earthquakes, since many systems behave as single degree of freedom systems. Thus, if you can find out the natural frequency of the structure, then the peak response of the building can be estimated by reading the value from the ground response spectrum for the appropriate frequency. In most building codes in seismic regions, this value forms the basis for calculating the forces that a structure must be designed to resist (seismic analysis).Fig 1. Building plan D. Different locations of installation of tower4. PLAN AND SPECIFICATIONS A. Building specifications Type of building Height of the building Number of stories Floor-to-Floor height Materials Column size Beam size Depth of Slab5. ModellingCommercial Building 35m Eleven (G+10) 3.2m M25 for beams M25 for columns Fe-415 for steel 650mm × 650mm 400mm × 400mm 125mmB. Tower specifications Height of tower Location Beams Leg Main bracing© 2019, IRJET|15m located on rooftop I-section ISA 100x100x10mm ISA 65x65x5mmImpact Factor value: 7.211Fig 2. Assigning beam and column properties|ISO 9001:2008 Certified Journal|Page 3356International Research Journal of Engineering and Technology (IRJET)e-ISSN: 2395-0056Volume: 06 Issue: 03 | Mar 2019p-ISSN: 2395-0072www.irjet.net5.1 Case I5.4 Case IVFig 6. Location 4 5.5 Case VFig 3. Location 1 5.2 Case IIFig 7. Location 5Fig 4. Location 2 5.3 Case III6. RESULTS Table -1: CASE-I Storey LevelDisplacements in (mm)11 10 8 6 4 2 0137.5 107 85 70 42 18 0Storey shear (KN) 79.5 178 221 469 735 936 0Storey Drift(mm) 18.92 14.2 11.3 9.56 6.47 4.23 0Fig 5. Location 3© 2019, IRJET|Impact Factor value: 7.211|ISO 9001:2008 Certified Journal|Page 3357International Research Journal of Engineering and Technology (IRJET)e-ISSN: 2395-0056Volume: 06 Issue: 03 | Mar 2019p-ISSN: 2395-0072www.irjet.netTable -2: CASE-II 7. PLOT OF COMPARISON BETWEEN CASES Storey LevelDisplacements in (mm)11 10 8 6 4 2 0111.9 91.23 69.23 51.43 29.56 13.9 0Storey shear (KN) 105 196 286 535 735 1086 0Storey Drift(mm) 16.35 11.1 9.41 7.36 4.96 3.11 0Table -3: CASE-III Storey LevelDisplacements in (mm)11 10 8 6 4 2 0131.8 104.9 81.2 62.12 38.96 15.6 0Storey shear (KN) 85.6 194 240 482 751 964 0Storey Drift(mm) Chart -1: Comparative Displacements16.52 13.2 10.3 8.54 5.23 3.15 0Table -4: CASE-IV Storey LevelDisplacements in (mm)11 10 8 6 4 2 0105.9 86.52 59.63 48.82 24.16 9.86 0Storey shear (KN) 101 186 256 502 696 951 0Storey Drift(mm) 15.34 10.3 8.63 6.42 3.92 2.51 0Chart -2: Comparative Base ShearTable -5: CASE-V Storey LevelDisplacements in (mm)11 10 8 6 4 2 091.36 72.36 42.3 32.6 16.98 5.62 0Storey shear (KN) 136 296 386 625 896 1203 0Storey Drift(mm) 12.36 8.96 6.21 5.23 2.05 1.36 0 Chart -3: Comparative Storey Drift© 2019, IRJET|Impact Factor value: 7.211|ISO 9001:2008 Certified Journal|Page 3358International Research Journal of Engineering and Technology (IRJET)e-ISSN: 2395-0056Volume: 06 Issue: 03 | Mar 2019p-ISSN: 2395-0072www.irjet.netChart -4: Comparative Twisting Moments3)Faria Aseem and Abdul Quadir ( Nov. 2017): “Effect of rooftop mounted telecommunication tower on design of building structure”, Vol.4, pp.2395-0072 3523, February 2012, ISSN 0976 – 43994)Drisya S. and Joshma M. (August 2016): “Seismic analysis of Low-Rise commercial building with rooftop telecommunication tower”, volume – 3, ISSN: 2348-83525)Archanna Dongre, et al., (April 2016): “Effect in Seismic response of a structure due to installation of a communication tower on existing building”, International Conference On Earthquake Engineering And Post Disaster Reconstruction Planning6)IS1893 (Part 1):2002, Indian Standard Code of Criteria for Earthquake Resistant Design of Structures, Bureau of Indian Standards, New Delhi.7)IS 456:2000, Indian Standard Code of Plain and Reinforced Concrete, Bureau of Indian Standards, New Delhi.8. CONCLUSIONS 1. Tower location at corner towards seismic is most critical direction, as it shows 33.56% increase in displacement, 34.67% increase in drift, 27.88% increase in twisting moments and 35.29% decrease in base shear compare to other locations.BIOGRAPHIES Digambar Patil is presently studying B.E (Civil Engineering) in VTC, Miraj, Maharashtra.2. Tower locations at corner but opposite to seismic waves provide better results than case (I). 3. Tower location in Case (IV) is better than case (II), the change of position shows 4.63% less displacement, 4.98% less drifts, 1.92% less twisting moments and 8.53% more base shear.Nilesh Sargar is presently studying B.E (Civil Engineering) in VTC, Miraj, Maharashtra.4. The ideal location of tower is in case (V) i.e., at center of building, as it is resulted in average 24.07% decrease in displacements, average 25.91% decrease in drifts, average 22.75% decrease in twisting moments and 35.29% increase in base shear.Abhishek Nannikar is presently studying B.E (Civil Engineering) in VTC, Miraj, Maharashtra.ACKNOWLEDGEMENT Words are inadequate in offering thanks to Mr. Amit Kharade, M.Tech., Assistant professor, T.K.I.E.T Engineering college for their valuable guidance and timely suggestions and kind encouragement to carry out this project work.Akshay Mahajan is presently working as Assistant professor, Dept. of Civil Engineering at VTC, Maharashtra. He obtained his M.Tech degree in Structures from RIT.REFERENCES 1)Nitin Bhosale, Prabhat Kumar and Pandey.A.D (2012): “Influence of Host Structure Characteristics on Response of Rooftop Telecommunication Towers”, International Journal of Civil and Structural Engineering Volume 2, No 3, February 2012, ISSN 0976 – 43992)Drisya S. and Joshma M. (August 2016): “Seismic analysis of Low-Rise commercial building with rooftop telecommunication tower”, volume – 3, ISSN: 2348-8© 2019, IRJET|Impact Factor value: 7.211|ISO 9001:2008 Certified Journal|Page 3359
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