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IJSRD - International Journal for Scientific Research & Development Vol. 6, Issue 06, 2018 ISSN (online): 2321-0613Analysis & Design of Transmission Tower & Monopole by using ManualCalculation & SoftwareMiss. Pooja D. Vaidya1 Prof. Riyaz Sameer Shah21PG Student 2Assistant Professor1,2Department of Civil Engineering1,2Prof Ram Meghe Institute of Technology & Research, Badnera, Amravati-444701,Maharashtra, IndiaAbstract— This research work is focused on comparison oftransmission tower and monopole tower for differentparameters viz. different height and different loadingcombinations. The comparative analysis is carried out withrespect to axial force deflection maximum sectional propertyand critical load conditions. The transmission tower andmonopole are design by manually by using limit state methodbased on IS 800, IS 802 IS 875 and gust factor method. Basedon steps and formulas involved, a design program will beprepare in MS-EXCEL. The veracity of program will becheck by first designing the manually designed transmissiontower and monopole using the software and compare results.Wind analysis is carried out using standard codes andsoftware. The behaviour of tower and pole is analysed fordifferent load combination. The maximum displacementvalues, shear forces and bending moments are obtained.Therefore, transmission tower and monopole should bedesigned considering both structural and electricalrequirements for safe and economical design as per Indiancode. It is concluded from past study that transmission towerhave lower lateral displacement as compared to monopole.This is because they have higher stiffness. Transmissiontower carry heavy electrical transmission conductor atsufficient and safe from the ground than monopole. Loadsacting on the tower and monopole are wind load, dead loadof the structure, braking load of conductor and earthquakeload considered as per Indian standard code. The steelquantity required for transmission tower is approximated twotimes more than monopole. The idea is to reach a definiteconclusion regarding the superiority of two structures.Key words: Transmission Tower, Monopole, Bracing, Loadscalculations include applied loads like wind load, dead load,seismic load and design strength of structural steel memberon superstructure including connection and foundation. Fromsafety considerations, along the route of the transmission lineclearances above open countries, roads, rivers, railway tracks,tele-communication lines, other power lines, etc. up toconductor needs to be maintained. The basic function of thetower is to isolate the conductors from their surroundings,including other conductors and the tower structure. . Analternative to the transmission tower, the monopole tower, isalso used in this power corridor. In this case, the monopolesupports much lower voltage conductors for distribution toindustrial customers and substations. The voltages requiredfor economical transmission of electric power exceeds thevoltages appropriate for distribution to customers.I. INTRODUCTIONIn last several studies have been performed in the area ofanalysis and design of metallic towers. The electrictransmission is the process by which large amounts ofelectricity produced at power plants is transported over longdistances for use by consumers. Usually steel transmissiontowers and monopoles are used to transmit the electric power.This is in view of non-availability of adequate land forinstallation of conventional lattice type tower. To overcomethese practical difficulties, a new concept of transmission lineis being used world-wide, called monopole. The cost oftransmission tower constitutes about quarter to half of the costof transmission line and hence optimum tower design willbring in substantial savings. The transmission tower aredesigned and constructed in wide variety of shapes, types,sizes, configuration and material. The supporting structuretype used in transmission line generally fall into one of thethree categories: lattice, pole guyed. According to IS 800-07,the wind forces are much prominent on the tower, conductorsand insulators, besides the self-weight. Tower structuralFig. 1: Transmission TowerFig. 2: MonopoleAll rights reserved by www.ijsrd.com100

Analysis & Design of Transmission Tower & Monopole by using Manual Calculation & Software(IJSRD/Vol. 6/Issue 06/2018/026)II. REVIEW OF LITERATUREThere are several studies done on the design and analysis oftransmission tower and monopole by using software. Thisliterature review reveals the amount of research work done inIndia.Sai Avinash, and Rajasekhar ISSN0974-5904, Vol09, no. 03 June-2016 [1] Analysis and design of transmissiontower by using Staad.Pro.v8i. This work is focused inoptimising the transmission tower with employing the X andK bracings, and by varying the sections, using static analysis.They concluded that the transmission tower modelled with Xbracing required lesser percentage of steel i.e. 6% whencompared to K bracing. In design aspect it reveals that byproviding unique sectional property throughout thetransmission tower leads to uneconomical design.Shivam Panwar, Yogesh Kaushik ISSN 2349-4476,Vol 4, Issue 5, May-2016 [2]. This research work an attempthas been made to compare the same transmission towers withsame bracing system at different wind zone viz. zone II andzone IV located at Delhi and Panjim. The conclusion aredrawn on the basis of the research and analysis done throughthe Staad.Pro.V8i. There is large difference in the bendingmoment forces on the members and there is huge change inaxial force in cross arms members of tower.D.B. Sonowal, J.D. Bharali ISSN2278-1684,2015[3] This work focused on Analysis and design of 220kVtransmission line tower (conventional method of analysis andIndian code based design) The transmission line tower is astatically indeterminate structure and the manual analysis ofsuch a structure is very complex. This paper consideringlinear behaviour with two dimensional approaches givessatisfactory results which should be further verified withadvanced software like Staad.Pro, Ansys etc. As per thedesign concern all section we consider are found safe againstworst condition.M. Pavan Kumar, P. Markandeya Raju Vol 18, no.6, 2017 [4] this research work presents a comparison betweenmonopole and self-support type towers with different heightsfor basic wind speed. This study was concluded that selfsupporting towers have lower lateral displacements comparedto monopole towers of same height and same amount ofloading due to the fact that they have higher stiffness. But dueto their rigidity, self-support tower have more load carryingcapacity than monopoles for towers of height less than orequal to 40M, Monopoles may be preferred but with increasein height above 50M self-supporting towers are moresuitable. This is because, during unexpected higher windspeeds due to cyclones (like hud hud), the structural rigiditywill be intact and the cost of damage and the repair of thestructure may not be so high unlike monopoleIII. AIM & OBJECTIVEThis works includes the analysis and design of transmissiontower and monopole for voltages 132 KV & 220 KV forsingle and double circuit. As the transmission tower requiredmore authentication for installation and also required moreright of way (ROW). Monopole suggests the better option toovercome this problem, without disturbing forest property.1) The main objective of this study is to analyse and designof transmission tower and monopole and to compare theperformances of transmission tower and monopole.2) To check the variations in lateral displacement for betterstiffness of structure.3) To check the tensions for the conductors and groundwire.4) To check the variations in stresses or forces in cross armsmembers in tower and monopole.5) To check the effects of different loads on transmissiontower and monopole.6) To check the bending moment of transmission tower andmonopole for which structure gives better strength.7) To check whether the transmission tower and monopoleshould be used in future.IV. METHODOLOGYThe transmission tower and monopole are design bymanually by using limit state method based on IS 800, IS 802,IS 875 and IS 5613. Based on steps and formulas involved, adesign program will be prepared in MS-EXCEL. The veracityof program will be check by first designing the manuallydesigned transmission tower and monopole, & then using thesoftware and compare results. An identical procedure will befollowed for both. The program for designing the same willdevelop by using MS-EXCEL and its fidelity will check byfirst solving manually also in software and then comparingresults. The transmission tower and monopole will design forvoltage between 132KV & 220KV. 4-legged transmissiontower and 16 sided polygonal shape monopole will design forsingle circuit and double circuit power.V. DESIGN OF TRANSMISSION TOWERA steel tower is to be erected for transmission tower for asingle circuit three phase.GIVEN DATASIZE / VALUE / QUANTITYVoltage of132 KVtransmissionPower conductorACSR (Panther)30/7/3mm ( Consisting of 54 strands30 mm dia ACSR 3 mm dia of aluminium & 7 strandsof 3 mm dia of steelUnit weight of16.76 N/mm (0.01676 KN/m)conductorPermissible axial35.60 KNtensionYoung’s modulus0.842 105 N/mm2of elasticityCircuitSingle (three phase)Material ofGalvanised steelground wireNo. of ground1wireDia of ground10 mmwirePermissible axial25.40 KNtensionWind span of240 mtower (L)All rights reserved by www.ijsrd.com101