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SUMMARY:Improving the seismic performance of  new and existing buildings t
 hrough  dynamic interaction with secondary  structures - Alessandro Palmer
 i\, Loughborough University
DTSTART:20211015T140000Z
DTEND:20211015T150000Z
UID:TALK164620@talks.cam.ac.uk
CONTACT:Mishael Nuh
DESCRIPTION:Tuned mass dampers (TMDs) are the simplest example of \nprimar
 y-secondary interaction used to mitigate the effects \nof dynamic actions 
 in a range of engineering structures. \nTypically\, a SDoF (single-degree-
 of-freedom) secondary \noscillator is attached to a MDoF (multi-degree-of-
 freedom) \nprimary structure\, at a position where its amplitude of \nvibr
 ation is expected to be relatively large\, and is tuned in \nsuch a way th
 at a significant proportion of the mechanical \nenergy is transferred from
  the primary structure to the \nsecondary oscillator. Linear and nonlinear
  TMDs have \nbeen shown to provide very efficient solutions in the design 
 \nof new structures and the retrofitting of existing ones. More \ngenerall
 y\, primary-secondary dynamic interaction can be \nexploited in more compl
 ex scenarios to enhance the \nperformance of building structures against w
 ind and \nseismic excitations.\nThis seminar will present the results of t
 wo research \nprojects currently under development at Loughborough \nUnive
 rsity. First\, the possibility of using nonlinear viscousfluid dampers co
 nnecting a primary building with \nsecondary reaction towers will be demon
 strated as a \nviable retrofitting strategy\, able to overcome some of the
  \nlimitations of more traditional approaches. The effects of \nthe key de
 sign parameters will be quantified\, including the \nnonlinearity of the d
 ampers\, their relative size and location\, \nthe primary/secondary stiffn
 ess ratio\, the ductility of both \nprimary and secondary structures\, the
  intensity of the \nseismic hazard. Second\, it will be shown that double-
 skin \nfaçades can be optimally designed to minimise the effects \nof sei
 smic forces on mid-rise building structures. The \nefficiency of this desi
 gn solution will be confirmed using \nboth recorded and artificially gener
 ated accelerograms and \napplying different optimisation tools. The combin
 ation of \nthese two studies highlights the tremendous potential of \nprim
 ary-secondary dynamic interaction when trying to \nminimise the seismic de
 mand in existing and new \nstructures.
LOCATION:Zoom (email structures-admin@eng.cam.ac.uk for link)
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