Blast Limits for Transmission Structures. II: Structural Response and Blast Limit Development
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Volume 24, Issue 1
Abstract
To ensure power transmission safety, loss of structural integrity of critical transmission facilities due to extreme events, such as strong ground motions induced by blasting, should be avoided. This research intends to establish a vibration safety limit for electric power transmission poles close to blasting events through actual field monitoring and finite-element (FE) simulation of transmission structure dynamic behaviors. In this paper, structural responses of transmission poles during monitored blasting are used to illustrate the methodology for safety limit establishment. The blast response spectra generated based on peak particle velocities were used as a basis for spectrum analysis performed using validated FE models to obtain the structural displacements, reactions, and stress states. The actual recorded ground vibrations as well as modified acceleration time histories were used as input excitations during transient dynamic analysis. A quantitative blast limit was established by comparing structural responses with corresponding design requirements.
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Acknowledgments
The writers would first like to acknowledge the support of Southern Company: Southern Company Transmission System Design Committee, Mr. Charles Munden and Mr. Dennis Mize. Special appreciation is extended to Mr. Colby Galloway, Mr. Luke Stafford, Mr. Eddie Sheffield of Southern Company, Mr. Bill Kitchens of the Alabama Department of Surface Mines, and Mr. Mac Sauls and Randall Franklin of the SAULS Seismograph group.
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Information & Authors
Information
Published In
Journal of Performance of Constructed Facilities
Volume 24 • Issue 1 • February 2010
Pages: 61 - 69
Copyright
© 2010 ASCE.
History
Received: Oct 2, 2008
Accepted: Aug 9, 2009
Published online: Aug 15, 2009
Published in print: Feb 2010
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