Location

London

Event Website

http://www.csce2016.ca/

Description

Transmission line structures play a vital role in transmitting electricity from the source of production to the distribution system. The main components of a transmission line are the conductors, the insulator strings, the ground wires and the supporting towers. Among the different types of supporting towers, prestressed concrete transmission poles have the advantages of low installation and maintenance costs, appropriate delivery time, and corrosion resistivity. To the best of the authors’ knowledge, this paper represents the first investigation conducted to assess the response of cantilever prestressed concrete poles to tornadoes. The localized nature of the tornadoes and the extended length of the conductors introduce some challenges in predicting the critical response of power transmission towers to tornadoes. The current study is conducted numerically using an in-house numerical model that includes the following: (1) a three-dimensional tornado wind field developed using computational fluid dynamics simulations; (2) a non-linear simulation of the structural behaviour of a prestressed concrete transmission poles taking into account the non-linear behaviour of the concrete and of the prestressed strands, and (3) a simulation of the non-linear behaviour of the conductors including the effects of the pretension force, sagging, the insulator’s stiffness and the non-uniform distribution of wind loads. Details of this numerical model are briefly discussed in this paper. A case study is considered to assess the importance of including the effect of tornadoes in the design of prestressed concrete poles.


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Jun 1st, 12:00 AM Jun 4th, 12:00 AM

NDM-524: CASE STUDY TO ASSESS THE SENSITIVITY OF PRESTRESSED CONCRETE POLES TO TORNADOES

London

Transmission line structures play a vital role in transmitting electricity from the source of production to the distribution system. The main components of a transmission line are the conductors, the insulator strings, the ground wires and the supporting towers. Among the different types of supporting towers, prestressed concrete transmission poles have the advantages of low installation and maintenance costs, appropriate delivery time, and corrosion resistivity. To the best of the authors’ knowledge, this paper represents the first investigation conducted to assess the response of cantilever prestressed concrete poles to tornadoes. The localized nature of the tornadoes and the extended length of the conductors introduce some challenges in predicting the critical response of power transmission towers to tornadoes. The current study is conducted numerically using an in-house numerical model that includes the following: (1) a three-dimensional tornado wind field developed using computational fluid dynamics simulations; (2) a non-linear simulation of the structural behaviour of a prestressed concrete transmission poles taking into account the non-linear behaviour of the concrete and of the prestressed strands, and (3) a simulation of the non-linear behaviour of the conductors including the effects of the pretension force, sagging, the insulator’s stiffness and the non-uniform distribution of wind loads. Details of this numerical model are briefly discussed in this paper. A case study is considered to assess the importance of including the effect of tornadoes in the design of prestressed concrete poles.

http://ir.lib.uwo.ca/csce2016/London/NaturalDisasterMitigation/17