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ANSYS analysis of transmission tower deformations
1.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 08 | Aug 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1377 Analysis of Transmission Tower using ANSYS Manu L1, Sowjanya G V2, S R Ramesh3, Dr. T V Mallesh4 1PG student, Department of Civil Engineering, SSIT, Tumkur-Karnataka, India 2Assistant Professor, Department of Civil Engineering, SSIT, Tumkur-Karnataka, India 3Professor, Department of Civil Engineering, SSIT, Tumkur-Karnataka, India 4Professor & Head, Department of Civil Engineering, SSIT, Tumkur-Karnataka, India ---------------------------------------------------------------------***---------------------------------------------------------------------- Abstract - Transmission tower is the main supporting aid for the transmission line, transmission tower should carry heavy electric conductors and safe height from the ground. In addition to this the transmission line should be capable of withstanding all the natural calamities, sotransmissiontower designing is an important engineering job where itinvolvesall the three basic engineering branches like civil engineering, mechanical engineering and electrical engineering. Transmission line towers carry heavy electrical transmission conductors at a sufficient and safe height from ground, In addition to their self-weight they have to withstand all the forces of nature like seismic load, wind load and snow load, therefore transmission line should be designed considering both structural and electrical requirements. The tower is analyzed for failure due to dead load, wind load, seismic load and natural frequencies. Anattempthasbeenmade inanalysis and modeling of transmissionlinetowerusingAutocad3Dand Finite element based ANSYS software. The model is created in Autocad 3D and then imported to ANSYS Workbench. The link element is used for the modeling. In the present study the behavioral changes due to deflection of transmission tower against static and dynamic loadings is carried out. Key Words: Transmission tower,ANSYS,Deflection, Seismic load, Wind load, 1. INTRODUCTION Transmission towersaretall structures,theirheight is much larger when compared with the lateral dimension. These towers generally will have separate foundation for each leg. The electric power generated at power plants will be transmitted through transmission lines supported by transmission towers. Transmission line towers carry heavy electrical transmission conductors at a sufficient and safe height from ground. In addition to their self-weight they have to withstand all the forces of nature like seismic load, wind load and snow load, therefore transmissionlineshould be designed considering both structural and electrical requirements. Transmission tower line system damage often brings the huge direct loss and indirect loss for the national economy, but the causes of destruction of transmission tower line is very complex, and the earthquake is a serious natural disasters, the earthquake under impact loading of transmission tower structure mechanics characteristic is a line of complex characteristic and research hot spot problems of the current domesticandinternational research hot spot problems. 1.1 Types of Transmission towers The electric transmission tower can be classified several ways. The most obvious and visible type towers are 1 Lattice structure 2 Tubular pole structure Lattice structure Lattice steel towers are made up of many different steel structural components connected together with bolts or welded. These towers are also called self-supporting transmission towers or free-standing towers, due to their ability to support themselves. These towers are not always made of steel, they can also be made of aluminium or galvanized steel. Tubular pole structure Tubular steel poles are anotherofthemajortypesof transmission towers. They aremadeupofhollowsteel poles. Tubular steel poles can be manufactured as one large piece, or as several small pieces which fit together 1.2 Components of transmission tower Transmission tower consists of following parts 1 Boom of transmission tower 2 Cage of transmission tower 3 Cross arm of transmission tower 4 Peak of transmission tower 5 Transmission tower body Fig-1:-Peak and cage of Transmission Tower
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 08 | Aug 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1378 Fig-2:- Cross Arm and body of Transmission Tower 1.3 Objectives The main objective of this study is to analyse the behaviour oftransmissiontowersystem whensubjected to dead load, seismic loads and wind loads by using Finite Element Method [FEM] and ANSYS. 1.4 Methodology This study presents a general finite element method framework for collapse simulation of the transmission tower subjected to earthquake and wind loads. Modelling of Transmission tower as per codal provisions. To find out the static response of transmission tower like deflections due to self-weight of the transmission tower using ANSYS. To study free vibrational or modal analysis characteristics of the transmission tower by determine the frequencies and mode shapes of transmissiontower using ANSYS. Dynamic analysis of a transmission tower using ANSYS. To determine static response of transmission tower structure due to wind load using ANSYS. 2. ANALYSIS OF TRANSMISSION TOWERS 3.1 Geometrical Data 1. Height of tower- 21.98 m 2. Bottom width of tower -5.6 m 3. Importance factor - 1.5 4. Response Reduction factor of – 4 [Steel frame with concentric braces]. 5. Seismic zone– Z=0.16. 6. Wind zone –I 7. Minimum ground clearance plus maximum sag of lower most wire = 15.42m 8. Vertical spacing between the conductor = 3.9m 9. Vertical spacing between conductorandtheground wire = 4.26 3.2 Basic Assumptions For the structural analysis of transmission towers the following assumptions are considered, the assumptions considered are, 1. All the members are considered to be thin three dimensional beams. 2. Damping of the system is neglected. 3. All the members are perfectly connected. 4. Effect of power conveying cables are isolated. 5. Tower frame is rigidly connected to the ground. Fig-3:-Typical tower drawing Fig-4:- Model of transmission tower in ANSYS workbench 3. RESULT AND DISCUSSIONS Static analysis is carried out by modeling the transmission line tower in AUTOCAD 3D. The prepared model is imported to ANSYS Workbench and then material properties, loads are assigned 3.1 Deformation due to self-weight and dead load in tower structure Maximum total deformation foundonelectrictower structure is 0.458 mm
3.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 08 | Aug 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1379 Fig-5:- Total Deformation due to self-weight 3.2 Modal Analysis of tower structure in Natural frequency modes Modal analysis in structural mechanics is used to determine the vibration characteristics (natural frequencies and mode shapes) of a structure. The natural frequencies and mode shapes are important parameters in the design of a structure for dynamic loading conditions. Fig-6: Total deformation in mode 1 Fig-7: Total deformation in mode 2 Fig-8: Total deformation in mode 3 Fig-9: Total deformation in mode 4 Fig-10: Total deformation in mode 5 Fig-11: Total deformation in mode 6 Fig-12: Total deformation in mode 7
4.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 08 | Aug 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1380 Fig-13: Total deformation in mode 8 Fig-14: Total deformation in mode 9 Fig-15: Total deformation in mode 10 Table 1:-Deformation due to natural frequency with various modes Mode Number Frequency (Hz) Deformation (mm) Type of mode shape for various DOF Mode 1 6.2988 0.18421 Mode shape for Longitudinal DOF Mode 2 6.365 0.1852 Mode shape for Lateral DOF Mode 3 15.777 0.3188 Mode shape for Twisting DOF Mode 4 18.336 0.42679 Mode shape for Longitudinal DOF Mode 5 18.352 0.44086 Mode shape for Lateral DOF Mode 6 20.023 0.36617 Mode shape for Twisting DOF Mode 7 22.325 0.3424 Mode shape for Longitudinal DOF Mode 8 22.674 0.28264 Mode shape for Lateral DOF Mode 9 23.076 0.32939 Mode shape for Twisting DOF Mode10 23.787 0.18824 Mode shape for Longitudinal DOF Chart -1: Maximum deformation of various modes due to Natural frequency 3.3 Response spectrum analysis Response spectra can also be used in assessing the response of linear systems with multiple modes of oscillation (multi-degree of freedom systems), although they are only accurate for low levels of damping. Modal analysis is performed to identify the modes, and the response in that mode can be picked from the response spectrum. These peak responses are then combined to estimate a total response. A typical combination method is the square root of the sum of the squares (SRSS) if themodal frequencies are not close The below graph shows the first 100 RS acceleration values that are recorded during the EL-Centro earthquake Fig-1.6: RS acceleration plot of first 100 values
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 08 | Aug 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1381 Fig-1.7: Total deformation due to RS analysis Maximum total deformation due to RS acceleration of EL-Centro earthquake is 2.197mm 3.4. Deformation due to wind load in tower structure The Transmission tower is analyzed statically by considering the wind load acting at an instant of time. There should not be large deflection which may cause extra bending in the transmission tower. The result of the static analysis is obtained in the form of maximum deformation and directional deformations. Fig-1.8: Wind load application Fig-1.9: Total deformation due to wind load Maximum total deformation due to wind load is 15.698mm 4. CONCLUSIONS The tower is analyzed for failure due to dead load, wind load seismic load and natural frequencies. An attempt has been made in analysis and modeling of transmission line tower using Autocad 3D and Finite element based ANSYS software. The model is created in Autocad and then imported to ANSYS Workbench. The link element is used for the modeling. In the present study the behavioral changes due to deflection of transmission tower against static and dynamic loadings is carried out. Following are the conclusions drawn from the analysis. The Value of Maximum total deformation obtained in the case of static analysis is 0.458 mm due to dead load and 15.698 mm obtained due to wind load. In Dynamic analysis, wind loads are dominating as compared to earthquake forces in zone I. The total deformation obtained from Response spectrum Analysis byconsideringRS accelerationof El Centro earthquake is 2.197mm. Thus wind load prove to be dominant among all loads for present tower. The analysis carried out using finite element analysis (ANSYS software) gives appropriate solutions including nodal, element, and member solutions. REFERENCES 1. N. Prasad Rao, G. M. Samuel Knight, S Seetharaman ,N. Lakshmanan, and Nagesh R. Iyer “Failure Analysis of Transmission Line Towers” Journal of Performance of Constructed Facilities, Vol. 25, No. 3, June 1, 2011. ©ASCE, ISSN 0887-3828/2011/3-231–240. 2. Wen-Qiang Jiang, Yao-Peng Liu, Siu-Lai Chan, and Zhang-Qi Wang, “Direct Analysis of an Ultrahigh- Voltage Lattice Transmission Tower Considering Joint Effects” Journal of Structural Engineering, © ASCE, ISSN 0733-9445. 3. Y. M. Ghugal, U. S. Salunkhe “Analysis and Design of Three and Four Legged 400KV Steel Transmission Line Towers: Comparative Study” International Journal of Earth Sciences and Engineering 691 ISSN 0974-5904, Volume 04, No 06 SPL, October 2011, 691- 694. 4. Gopi Sudam Punse “Analysis and Design of Transmission Tower” International of Modern Engineering Research(IJMER)ISSN:2249–6645,Vol.4, Issue. 1, Jan. 2014, 116-138. 5. N. PrasadRao, G.M.Samuel Knight, S.J.Mohan, N. Lakshmanan “Studies on failureoftransmissionline towers in testing” College of Engineering ,Anna University, Chennai ,India, Structural Engineering Research Centre, Chennai ,India. 6. G.Visweswara Rao “Optimum designs for transmission line towers” Senior research Analyst, Engineering Mechanics Research India, 907 Barton Centre Bangalore-560 001, India Computer & Structures vol.57.No.1.pp.81-92, 1995. 7. V. Lakshmi, A. Rajagopala Rao “Effect Of Medium Wind Intensity On 21M 132kV Transmission Tower” International Journal OfEngineeringScience& Advanced Technology, Volume-2, Issue-4, 820 – 824, ISSN: 2250–3676.
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 08 | Aug 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1382 8. QianXu,YongxingZhangJiangongchen“Analysis of Tran smission Tower under the effect of Ruptured Wire Loads”International Journal of Energy Science (IJES), V olume 3, Issue 4, August 2013 9. Xiaohong Long , Wei Wang, and Jian Fan “Collapse Analysis of Transmission Tower Subjected to Earthquake Ground Motion” Modelling and Simulation in Engineering Volume 2018, Article ID 2687561, 20 pages. 10. Faruq M. A. Siddiqui and J. F. Fleming. (1984) “Broken Wire Analysis of Transmission Line Systems”, Computers and Structures. Volume 18, Issue 6. 1077- 1085. 11. Ehasz, F. L., "A study of transmission towers” M. S. Thesis, Lehigh University, 1936" (1936).Fritz Laboratory Reports. Paper 1191. 12. Zhuoqun Zhang, Hongnan Li,Gang Li,Wenming Wang and Li Tian “The Numerical Analysis of Transmission Tower-Line System Wind-Induced Collapsed Performance” Hindawi Publishing Corporation Mathematical Problems in Engineering Volume 2013, Article ID 413275, 11 pages. 13. H. Li and H. Bai, “High-voltage transmission tower- line system subjected to disaster loads” Progress in Natural Science, vol. 16, no. 9, pp. 899–911, 2006. 14. L. Tian, H. Li, and G. Liu, “Seismic response of power transmission tower-line system subjected to spatially varying ground motions” Mathematical Problems in Engineering, vol. 2010, Article ID 587317, 20 pages, 2010. 15. Li Tian, Ruisheng Ma, Wenming Wang and Lei Wang, “Progressive Collapse Analysis of Power Transmission Tower underEarthquakeExcitation” The Open Civil Engineering Journal. 7. 164-169, October 2013. 16. S.Christian Johnson ,G.S.Thirugnanam ,“Experimental study on corrosion of transmission line tower foundation and its rehabilitation” International Journal Of Civil And Structural Engineering, Volume 1, No 1, 2010,ISSN 0976 – 4399 17. Siddu Karthik C S, G V Sowjanya, “static and dynamic analysis of transmission line towers under seismic loads” International Journal of Engineering Research and Technology (IJERT), ISSN: 2278-0181,vol4issue8, August 2015. 18. Veena G, Sowjanya G V “Seismic analysis of four legged telecommunication towers using dampers” International Research Journal Of Engineering and Technology (IRJET), e-ISSN:2395-0056,p-ISSN:2395- 0052,vol 4,issue 6,June 2017
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