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SUMMARY:ENAC Seminar Series by Prof. M. Vassiliou
DTSTART:20210825T090000
DTEND:20210825T100000
DTSTAMP:20260920T211101Z
UID:a83101f05b24d88157f4f349f471538f2eb73839cbf3a7f890e24d6a
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Michalis Vassiliou\n09:00 – 10:00 – Prof. Michalis V
 assiliou\nAssistant professor\, ETH Zürich\n\nNovel testing techniques fo
 r the innovative design and rational evaluation of structures\n\nShake tab
 le blind prediction contests show that numerical models fail to predict th
 e test results with a reasonable accuracy. This directly questions the sci
 entific value of our analysis and design methods. Moreover\, it leads to c
 onservative design philosophies and to a consequent waste of material. Thi
 s does not contribute to sustainable design.\nThe “non-predictability”
  is one of the most important arguments against designing bridge piers tha
 t can uplift and sustain rocking motion during an earthquake – a strateg
 y that could lead to more economical and sustainable seismic design.\nThis
  presentation will show that trying to predict the response of a structure
  to a single ground motion is too strict of a validation test and often a 
 meaningless procedure. Alternatively\, it will suggest a weaker but suffic
 ient validation methodology where numerical models are evaluated based on 
 their performance in predicting the statistics of the response to ensemble
 s of ground motions.\nThe presentation will discuss how the above statisti
 cal validation approach has been used to show that 3D rocking motion is 
 “predictable enough” for the scope of earthquake engineering – hence
  engineers can take advantage of it for design. It will present tests of a
  rocking bridge-like large-scale specimen comprising reusable precast elem
 ents connected dryly with flexible restrainers. After 180 excitations\, th
 e specimen presented negligible damage.\nFinally\, this presentation will 
 claim that a statistical validation approach can and should be used to eva
 luate the system-level assumptions of RC and masonry numerical models. Sin
 ce this is impossible at a full scale\, small scale (1:10-1:40) physical m
 odels of both RC and masonry structures should be manufactured using 3D pr
 inting technologies and tested in a geotechnical centrifuge to preserve si
 militude of stresses. This is the main idea behind our recently awarded ER
 C and ETH grants and this presentation will discuss some first results.\n\
 nShort bio:\nMichalis Vassiliou is currently an Assistant Professor and ho
 lds the Chair of Seismic Design and Analysis\, at the Institute of Structu
 ral Engineering (IBK) of ETH Zürich. He is a Civil Engineer and has studi
 ed in NTU Athens (Diploma 2004)\, UC Berkeley (MSc 2006)\, and University 
 of Patras (PhD 2010). Between 2012 and 2019 he was a Postdoc and a Senior 
 Assistant in the ETH. In 2019\, he was hired as an Assistant Professor in 
 the ETH after receiving an ERC Starting Grant. His research interests lie 
 in the fields of Structural Engineering with a special focus in Seismic En
 gineering using both experimental and analytical methods. At the ETH\, he 
 is teaching courses on Structural Dynamics and Seismic Isolation.
LOCATION:https://epfl.zoom.us/j/62283689580
STATUS:CONFIRMED
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