SEISMIC BEHAVIOUR OF 4-LEGGED SELF-SUPPORTING TELECOMMUNICATION TOWERS CONSIDERING EARTHQUAKE EFFECTS IN MALAYSIA
DOI:
https://doi.org/10.11113/mjce.v24.15830Keywords:
Structural Integrity Telecommunication Towers, Earthquake Effects, Peak Ground Acceleration.Abstract
Malaysia’s strategic location has spared it from major seismic activities. Nevertheless, plethora of far field tremors resulting from earthquakes in neighboring countries can be felt locally despite the fact that the epicenters of these earthquakes are mostly hundreds of kilometers away. With increasing frequency and intensity of late, this scenario has raised a major concern pertaining to the ability of the existing buildings and sensitive structures in the country to withstand earthquakes events in the future. Considering that no specific study has been contemplated with particular regards to the effect of earthquakes to telecommunications facilities in Malaysia, it is requisitely of prime significance to commence this study. The main objective of the study is to determine the seismic behavior and then evaluate the structural integrity of the existing telecommunication tower structures considering earthquake effects in Malaysia. The study covers the analysis of the four (4) legged self supporting steel telecommunication towers based on different types of seismic zones, peak ground accelerations (PGAs), and soils, using the SAP2000 finite element software, model development with reference to the International Building Code (IBC2000) and Euro Standards (EC8). Among the main components of the study are; data analysis, site visits, model development, analysis and structural evaluation. Linear static analysis involving joints displacement and base shear reactions with axial forces analysis are being carried out. In the end, the study has able to determine the seismic behavior experienced by the modeled towers on the differing type’s conditions exposed on them. With the results it will enable the researcher to further proceed with the study including developing a complete maintenance assessment system which also includes the justification/determination of the types of damages inflicted to the towers as well as the severity of the damages.References
Adnan, A., Hendriyawan, Marto, A. and Masyhur, I, (2006). Development of Seismic Hazard Map for Peninsular Malaysia. Proceeding on Malaysian Science and Technology Congress.
Kuala Lumpur, Malaysia. 18-26 September.
Amiri, G.G.,(1997). Seismic Sensitivity of Tall Guyed Telecommunication Towers. Ph.D Thesis, Dept. of Civil Engineering and Applied Mechanics, McGill University. Montreal, Quebec, Canada.
Amiri, G.G., Zahedi, M.A., and Jalali, R.S., (2004). Multiple- Support Seismic Excitation of Tall Guyed Telecommunication Towers. 13th World Conference on Earthquake Engineering,
Vancouver, British Colombia, Canada, August 1-6, 2004, Canadian Association for Earthquake Engineering, Paper No. 212.
Amiri, G.G., Barkhordari, M.A., Massah,S.R., and Vafaei,M.R., (2007). Earthquake Amplification Factors for Self-Supporting 4-Legged Telecommunication Towers. World
Applied Sciences Journal 2 (6): 635-643.
ASCE Standards [ASCE/SEI 7-10], Minimum Design Loads for Buildings and Other Structures. American Society of Civil Engineers, Reston, Virginia.
ASCE Manual and Report on Engineering Practice No 72 (ASCE Manual 72). (1990). Design of Steel Transmission Pole Structures, 2nd. Ed., American Society of Civil Engineers, Reston,
Virgina.
ASCE Manual and Report on Engineering Practice No 74 (ASCE Manual 74). (1991). Guidelines for Electrical Transmission Line Structural Loading, American Society of Civil
Engineers, Reston, Virgina.
Assi,R. and McClure,G. (2007). A Simplified Method for Seismic Analysis of Rooftop Telecommunication Towers. Canadian Journal. Civil Engineering 34: 1352-1363.
Bai. F.L., Li, H.N. and Hao. H., 2010. Local Site Effect on Seismic Response of Coupled Transmission Tower-Line Systems. ASCE, 161.139.200.238 [accessed 12 January 2011.
European Standards [EN 1998-1], Eurocode 8: Design of Structures for Earthquake ResistancePart
: General Rules, Seismic Actions and Rules for Buildings. Supersedes ENV 1998-1- 1:1994, ENV 1998-1-2:1994,ENV 1998-1-3:1995, December (2004).
Executive Report on Typhoon and Earthquake Disaster, 30
th September, 2009, (2009). Fire Department Headquarters, Putrajaya, Malaysia.
Faridafshin,F. and Mc. Clure,G, (2008). Seismic Response of Tall Guyed Masts to Asynchronous Multiple-Support and Vertical Ground Motions ASCE, Journal of Structural Engineering.
Galvez C, Mc Clure, G. (1995). A Simplifield Method for Aseismic Design of Self-Supporting Lattice Telecommunication Towers. Proceedings of the 7th Canadian Conference ob
Earthquake Engineering, Montreal, Canada, p. 541-548.
Hiramtsu,K., Sato, Y., Akagi, H., and Tomita, S. (1989). Seismic Response Observation of Building Appendage. In Proceedings of the 9th World Conference on Earthquake Engineering, Tokyo, 2-9 August 1988. Japan Association for Earthquake Disaster Prevention, Tokyo. Vol. 6, pp.237-242.
International Building Code
Institution of Engineers Malaysia, (2005). Position Paper on Issues Related to Earthquake, IEM, Malaysia.
Japan Society of Civil Engineers (JSCE). (1995). Preliminary Report on the Great Hanshin Earthquake January 17, 1995. Japan Society of Civil Engineers 1995.
Kanazawa,K., and Hirata, K. (2000). Seismic Analysis for Telecommunication Towers Built on the Building. In Proceedings of the 12th World Conference on Earthquake Engineering,
Auckland, New Zealand, 30 January-4 February, 2000. New Zealand Society for Earthquake Engineering, Upper Hutt, New Zealand. Paper 0534.
Kehdr,M.A., and McClure,G (1999). Earthquake Amplification Factors for Self-Supporting Telecommunciation Towers. Canadian Journal of Civil Engineering 1999; 26(2): pp. 208-215.
Komoo, I., Salleh, H., Tjia, H.D., Aziz, S., Tongkul, F., Jamaluddin, T.A. and Lim, C.S., (2005). Kundasang Landslide Complex: Mechanism, Socio-Economic Impact and Governance (in
Malay).
Konno,T., and Kimura, E. (1973). Earthquake Effects on Steel Structures Atop Buildings. In Proceedings of the 5th World Conference on Earthquake Engineering, Rome, 25-29 July 1973.
Ministry of Public Works, Rome. Italy. Vol. 1,pp.184-193.
Luin, C.C (2008). Seismic Effects: A Threat to Local Structures? Jurutera, Institution of Engineers Malaysia Volume 3, p.6.
Mikus, J. (1994). Seismic Analysis of Self-Supporting Telecommunication Towers. M. Eng. Project Report G94-10, Department of Civil Engineering and Applied Mechanics, McGill
University, Montreal, Canada.
McClure, G. (1999). “Earthquake-resistant design of towers.†Proc., Meeting of IASS Working Group 4 on Masts and Towers.
National Institute of Standards and Technology (NIST) (1995). The January 1995 HyogokenNanbu (Kobe) earthquake performance: performance of structures, lifelines, and fire
protection systems. NIST Special Publication 901, United States 25. National Institute of Standards and Technology, Gaithersburg, MD, July 1996.
NRC/IRC National Research Council of Canada / Institute of Research in Construction (2005). National Building Code of Canada 2005, Ottawa, ON, Canada.
Public Works Department Malaysia, (2008). Seismic Design Guidelines for Concrete Buildings in Malaysia. (JKR20601-0184-09).
Sato,Y., Fuse,T., and Akagi, H. (1984). Building Appendage Seismic Design Forced Based on Observed Floor Response. In Proceedings of the 8th World Conference on Earthquake
Engineering, San Fransisco, California, 21-28 July 1984. Prentice Hall Inc., Englewood Cliffs, N.J. pp. 1167-1174.
Sackmann, V. (1996). Prediction of Natural Frequencies and Mode Shapes of Self-Supporting Lattice Telecommunication Tower. M. Eng. Project, 1996. Department of Civil Engineering
and Applied Mechanics, McGill University, Montreal, Canada.
Schiff, S.D. (1988). Seismic Design Studies of Low-Rise Steel Frames. PhD Thesis. Department of Civil Engineering, University of Illinois at Urbana-Champaign. Smith, B. W. (2007). Communication Structures, Thomas Telford Publishing Ltd, London.
TIA Standards, Structural Standard for Antenna Supporting Structures and Antennas, Telecommunication Industry Association, TIA-222-G, (Revision of TIA-22-F) August (2005)
(Revision of TIA-222-F) April (2007).
Telekom Malaysia Asset Management System, TM TeAMS Web Site, http://intra.tm.teams/ [cited January 2009]
