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<p class="MsoNormal"><b>NHERI
SimCenter</b><span style="font-size:13.5pt">–</span><b> Natural Hazards
Engineering 101<br>
Wednesday, <span style="color:black">August 30, 2017, 11am – 12pm PDT</span></b></p>
<p class="MsoNormal"><b>Understanding Tsunamis and Their Effects</b></p><p class="MsoNormal"><b><br></b></p>
<p class="MsoNormal"><b>REGISTER</b>
for this webinar at<a href="https://www.designsafe-ci.org/learning-center/training/simcenter/webinar-170830/"><br>
https://www.designsafe-ci.org/learning-center/training/simcenter/webinar-170830/</a></p>
<p class="MsoNormal">Connection
information will be distributed upon receipt of registration.<span style="color:rgb(117,117,117)"> <br></span></p><p class="MsoNormal"><span style="color:rgb(117,117,117)"><br></span></p><p class="MsoNormal"><span style="color:rgb(117,117,117)"><br></span></p>
<p class="MsoNormal"><b>ABSTRACT:</b> <br>
<br>
Tsunamis are translational long waves created by the seafloor displacement.
Here we focus on tsunamis triggered by co-seismic fault rupture. Geophysical
time-and-space scales relevant to tsunami phenomenon are discussed, emphasizing
its unique natural hazard phenomenon. Characteristics of tsunami generation,
propagation, and inundation are also presented.</p>
<p class="MsoNormal">Then, lessons learned from the 2011 Heisei Tsunami are
presented. This 2011 event has altered our traditional concepts on tsunami
hazards. Prior to this event, it was understood that reinforced concrete
structures could withstand tsunami actions. This concept is no longer the case.
Many concrete buildings and coastal protective structures (seawalls and coastal
dykes) failed by rotation. Several failure patterns of seawalls and coastal
dykes are examined. Flow-induced suction pressures on the crown must play a
role in the failure of concrete panels that had covered dyke’s infill. High-speed
flows together with high compressing pressures caused the formation of scour at
the leeside foot of the dyke. Then, we examine a couple of reinforced concrete
buildings that were exposed to similar tsunami loadings, but one was toppled
and the other survived. The presence of soil foundation causes a time delay and
attenuation of the buoyancy effect on the buildings. The buildings are also
stabilized by the weight of water that has flooded the inside. A few directions
are discussed for the development of design considerations for buildings and
coastal structures to cope with the “beyond-the-design-basis” extreme coastal
hazards. At the conclusion, some conceptual strategies to approach such complex
problems of extreme natural hazards are presented.<br><br></p>
<p class="MsoNormal"><b>PRESENTER:</b>
<b><br>
Harry Yeh</b> is a Professor in Civil Engineering at Oregon State University. He
received an AB in Economics from Keio Gijuku University (Japan), BS and MS
degrees in Agricultural Engineering from Washington State University, and a PhD
in Civil Engineering from University of California. He worked for Bechtel Inc.
in the late 1970s and early 1980s, primarily analyzing hydrodynamics problems
involved in electric power plants. Professor Yeh began his academic career in
1983 at the University of Washington, then joined the faculty of School of
Civil and Construction Engineering at Oregon State University in 2003. His primary
research interest is in the field of hydrodynamics of tsunamis, focusing on
controlled laboratory experiments and theoretical development of nonlinear
long-wave theory. Professor Yeh participated in several reconnaissance field
surveys for tsunamis – from the 1992 Nicaraguan event to most recent Japanese
Tsunami in 2011. <br></p><p class="MsoNormal"><br></p>
<p class="MsoNormal"><b>About
Natural Hazards Engineering 101:</b> <span style="color:rgb(117,117,117)"> </span></p>
<p class="MsoNormal">NHE
101 is a webinar series intended to provide a common knowledge base for the
NHERI community. Webinars will, for each of the primary natural hazards in the
NHERI program, provide an introduction to fundamental concepts and an overview
of experimental- and simulation-based research. Webinars will also provide an
introduction to numerical methods and computational tools used in NHE research.
All are encouraged to participate.</p>
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