<div dir="ltr"><div><p class="MsoNormal"><b><span style="font-size:18pt">Reminder to register for today's NHERI SimCenter – Early Career
Researcher Forum</span></b><span></span></p>
<p class="MsoNormal"><span style="font-size:18pt">Wednesday, June 28, 2017, noon – 1pm (PDT)</span></p><p class="MsoNormal"><br></p><p class="MsoNormal"><span style="font-size:18pt"></span><span></span></p>
<p class="MsoNormal"><span style="font-family:cambria"> </span><span></span></p>
<p class="MsoNormal"><b><span style="font-size:18pt">Uncertainty Analysis of Structural Seismic Response
Parameters Using High-Throughput Computing<span></span></span></b></p>
<p class="MsoNormal"> <span></span></p>
<p class="MsoNormal"><b>PRESENTER</b>: Zach
Caamano-Withall<span></span></p>
<p class="MsoNormal">Zach Caamano-Withall is a Ph.D. student in the Department of
Structural Engineering at UC San Diego. Working with Prof. Joel P. Conte, his
research focuses on probabilistic modeling and analysis in the context of
reliability-based, performance-based seismic analysis and design of civil
structures. Zach received his undergraduate degree from UC San Diego in 2015.<span></span></p>
<p class="MsoNormal"> <span></span></p>
<p class="MsoNormal"><b>REGISTER</b>
for this webinar at<span></span></p>
<p class="MsoNormal"><a href="https://www.designsafe-ci.org/learning-center/webinar-170531/" target="_blank"><span style="font-family:calibri">https://www.designsafe-ci.org/<wbr>learning-center/webinar-170531<wbr>/</span></a><span style="font-size:12pt"><span></span></span></p>
<p class="MsoNormal">Connection information will be distributed upon receipt of
registration.</p><p class="MsoNormal">Registration to close at 11am (PDT).<br></p><p class="MsoNormal"><span style="color:rgb(117,117,117)"><span></span></span></p>
<p class="MsoNormal"><span style="color:rgb(117,117,117)"> </span></p>
<p class="MsoNormal"><b>ABSTRACT</b>: Reliability-based
seismic design of structures requires an ensemble of nonlinear time history
analyses (NLTHA) based on a nonlinear finite element (FE) model of the
structure of interest. This ensemble of NLTHAs typically accounts for the
seismic record-to-record variability, but can also consider the variability
(uncertainty) of the FE model parameters. For detailed nonlinear FE structural
models, a single NLTHA is computationally intensive (runtime on the scale of
hours or days). To statistically quantify the variability of the structural
response, Monte Carlo simulation (and its various derivatives) can be employed
to set up the ensemble analysis. Monte Carlo simulation, known for being one of
the most robust yet computationally expensive methods to propagate uncertainty
through a numerical analysis, is made computationally feasible via
parallelization on a supercomputer.<span></span></p>
<p class="MsoNormal"><span> </span></p>
<p class="MsoNormal">A 5-story three-dimensional steel moment building frame
subject to both model parameter uncertainty and ground motion record-to-record
variability is analyzed in parallel using a hybrid statistical/structural
analysis software. This software was created by coupling two open-source
software frameworks: Dakota, developed by Sandia National Laboratories, for
uncertainty quantification and OpenSees (Open System for Earthquake Engineering
Simulation) for advanced modeling and analysis of structural and geotechnical
systems subjected to earthquakes. Some of the capabilities of this coupled
framework will be illustrated through this application example.<span></span></p><p class="MsoNormal"><br></p></div></div>