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Posted: Fri Dec 31, 2004 12:44 pm Post subject: Discussion on Tsunamis
Dear SefI Members,
Please allow me to initiate a discussion on Tsunamis. This is not related to any project as such but is aimed to increase my knowledge about this relatively less known phenomenon amonst the structural engineering community.
I have few questions about it.
1. How is the design earthquake arrived at for Tsunamis?Unlike earthquakes that occur over land & is attenuated / amplified /modified by soil or bedrock ,Tsunamis waves travel over water.
2. Is there any Indian code that gives the seismic coefficients or any formulations to arrive at the wave velocity?
3. Do we have to look into Japanese literature to know more about how to design structures to resist Tsunamis?
I gathered some information about Tsunamis from the "Seismic Design Handbook by Farzad Naeim" I would like to share it with everyone.
"It has been suggested that a structure could be designed to resist tsunami waves. Special consideration would be needed to minimize the effects of a Tsunami. First ,the major axis or long dimension of the building should be oriented parallel to the expected direction of the wave. A building with this orientation would have a minimal surface area that could be attacked by the on -coming waves. In addition ,the building will have greater strength to resist the wave forces because of greater amount of structural stiffness providing resistance along the major axis. Consideration should also be given to leaving the lower portion of the building completely open which would greatly reduce the total load applied to the structure from the Tsunami wave."
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