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Simplified Dynamic Analysis Methods for Guyed Telecommunication Masts under Seismic Excitation
Earthquake-resistant design of essential infrastructure is paramount in areas with high seismic hazard and risk. Such critical infrastructure includes tall telecommunication masts which are highly nonlinear structures owing to the behaviour of their multi-level guy clusters. During earthquakes, their multi-support foundation is subjected to seismic wave delays that vary with the shear wave velocity of underlying soil. Such effects can be properly described in detailed nonlinear seismic analysis models, which are mainly used to explain exceptional situations (for example, mast failures) and for research purposes. However, the degree of complexity and sophistication these models require is too high for routine engineering design, and simplified procedures are necessary to perform design checks on the seismic vulnerability of tall masts. As a first step towards a simplified dynamic analysis procedure, this paper presents a method to obtain the equivalent dynamic properties of guy clusters. The method is based on rational cable mechanics and is verified with results from detailed finite element analysis of selected detailed models of real guy cables. However, the number of towers and the frequency range studied are limited, as this paper presents an ongoing research. More case studies are necessary to validate the method before it can be used in engineering practice.
Simplified Dynamic Analysis Methods for Guyed Telecommunication Masts under Seismic Excitation
Earthquake-resistant design of essential infrastructure is paramount in areas with high seismic hazard and risk. Such critical infrastructure includes tall telecommunication masts which are highly nonlinear structures owing to the behaviour of their multi-level guy clusters. During earthquakes, their multi-support foundation is subjected to seismic wave delays that vary with the shear wave velocity of underlying soil. Such effects can be properly described in detailed nonlinear seismic analysis models, which are mainly used to explain exceptional situations (for example, mast failures) and for research purposes. However, the degree of complexity and sophistication these models require is too high for routine engineering design, and simplified procedures are necessary to perform design checks on the seismic vulnerability of tall masts. As a first step towards a simplified dynamic analysis procedure, this paper presents a method to obtain the equivalent dynamic properties of guy clusters. The method is based on rational cable mechanics and is verified with results from detailed finite element analysis of selected detailed models of real guy cables. However, the number of towers and the frequency range studied are limited, as this paper presents an ongoing research. More case studies are necessary to validate the method before it can be used in engineering practice.
Simplified Dynamic Analysis Methods for Guyed Telecommunication Masts under Seismic Excitation
Oskoei, S. Ali Ghafari (author) / McClure, Ghyslaine (author)
Structures Congress 2009 ; 2009 ; Austin, Texas, United States
Structures Congress 2009 ; 1-10
2009-04-29
Conference paper
Electronic Resource
English
Simplified Dynamic Analysis Methods for Guyed Telecommunication Masts Under Seismic Excitation
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