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SUMMARY:Geotechnical Earthquake Engineering over the past 50 years - Profe
 ssor Izzat Idriss\,  Professor Emeritus \,  University of California at Da
 vis
DTSTART:20110331T150000Z
DTEND:20110331T160000Z
UID:TALK30447@talks.cam.ac.uk
CONTACT:Zelda Stuck
DESCRIPTION:Case Histories have always played a strong role in geotechnica
 l engineering.  They have been an essential means for: (a) improving under
 standing\; (b) calibrating analytical procedures\; (c) designing and inter
 preting physical model tests\; and (d) developing semi-empirical procedure
 s.  These apply for static\, during earthquake and post-earthquake loading
  conditions.\n\nThe discussion will cover case histories involving the beh
 avior of three soft soil sites in Anchorage during the 1964 great Alaska e
 arthquake.  It will also cover liquefaction of cohesionless soils triggere
 d by earthquake ground motions\, and will address the following four quest
 ions:\n\n1.	Why are the published curves of cyclic resistance ratio (CRR) 
 versus (N1)60 or versus (N1)60cs different\, depending on whose model is i
 mplemented?\n\n2.	Can we treat these differences as "epistemic" uncertaint
 y and hence can use all models with "assigned weights"? \n\n3.	Can we use 
 site response analyses to obtain the induced cyclic stress ratio (CSR) or 
 do we have to always use the simplified stress ratio equation? \n\n4.	How 
 should we treat liquefaction at depths exceeding those included in the liq
 uefaction case histories? \n\nThe lessons learned from the behavior of thr
 ee soft clay sites in Anchorage in 1964 and the importance of the response
 s to the four questions to engineering practice will be highlighted. \n\n
LOCATION:Engineering Department - Lecture Room 6
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