Quote:
Originally Posted by hammersklavier
I'm not entirely sure how we can be "overdue" for a major earthquake. The East Coast isn't exactly a very seismically active area, and unless there's a New Madrid fault nobody knows about lurking, there isn't much of anything that could even generate a quake of that magnitude around these parts.
(That said, it doesn't hurt to earthquakeproof things.)
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But it is and there is- witness the
recent Virginia quake.
Boston and
Charleston both got significant earthquakes during colonial times. The label of 'major' earthquake is a bit relative compared to west coast standards, where major would be 7.5-8 and up. 6 would be major on the east coast precisely because earthquakes are less common. The bedrock also makes a difference between the east coast and the west coast. In general, bedrock on the east coast is very strong, and allows the seismic energy of even small earthquakes to spread much farther before dissipating than on the west coast; affecting disproportionately large areas.
Philly's seismic hazard is above background levels, but not as high as New York, Boston, Richmond, or Charleston; with Charleston actually being almost on par with New Madrid or the west coast.
As to the original question of how concrete is anchored to the steel structure, these nifty shear studs are welded to the steel and then embedded in the concrete when poured.
http://www.panchsheelfasteners.net/s...s-1495502.html
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