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SUMMARY:Rocking Isolation for bridges and buildings: analysis\, experiment
 s\, and new concepts to minimize permanent deformation - Ioannis Anastasop
 oulos\, Professor and Chair in Civil Engineering\, University of Dundee
DTSTART:20150115T160000Z
DTEND:20150115T173000Z
UID:TALK56633@talks.cam.ac.uk
CONTACT:Anama Lowday
DESCRIPTION:According to current seismic codes\, the foundation soil is no
 t allowed to fully mobilize its strength\, and plastic deformation is rest
 ricted to above-ground structural members. Capacity design is applied to t
 he foundation guiding failure to the superstructure\, thus prohibiting mob
 ilization of soil bearing capacity. However\, a significant body of eviden
 ce suggests that allowing strongly nonlinear foundation response may be ad
 vantageous. The lecture will introduce an alternative seismic design philo
 sophy termed rocking isolation\, in which soil yielding is used as a “fu
 se”. According to such a scheme\, the foundation is intentionally under-
 designed to uplift and fully mobilize its bearing capacity\, limiting the 
 inertia transmitted onto the superstructure. To unravel the effectiveness 
 of rocking isolation\, an idealized bridge pier is used as an illustrative
  example. A conventionally designed system is compared with a rocking–is
 olated alternative. Their seismic performance is explored analytically\, t
 hrough nonlinear finite element analyses\, and experimentally\, through sh
 aking table and centrifuge model testing. A similar comparison is performe
 d for an existing 3-storey building\, designed and constructed according t
 o obsolete seismic codes\, and retrofitted by adding shear walls. Emphasis
  is placed on the foundation of the shear walls\, comparing conventional d
 esign with rocking isolation. The physical model encompasses the structura
 l system\, along with the foundations\, and the soil. The nonlinearity of 
 structural members is simulated through specially–designed and carefully
  calibrated artificial plastic hinges. The vulnerability of the original s
 tructure is confirmed\, as it is found to collapse with a soft-storey mech
 anism when subjected to moderate intensity seismic shaking. The convention
 ally retrofitted structure is proven capable of sustaining larger intensit
 y shaking\, and the rocking–isolated structure is shown to offer increas
 ed safety margins. Finally\, novel concepts are introduced\, aiming to red
 uce the permanent rotations and settlements. \n\nBiography: \nProfessor Io
 annis Anastasopoulos\, Chair of Civil Engineering at the University of Dun
 dee\, specializes in geotechnical earthquake engineering and soil–struct
 ure interaction\, combining numerical with experimental methods. His acade
 mic degrees include a PhD from the National Technical University of Athens
  (NTUA)\, a MSc from Purdue University\, and a Civil Engineering Diploma f
 rom NTUA. His publication record includes 65 publications in refereed jour
 nals\, and 120 more in books and conference proceedings. Ioannis also has 
 extensive professional experience\, as he has worked in a variety of proje
 cts of significance in Greece\, but also in the US (Queensboro bridge)\, a
 nd the Middle East (over 70 Technical Reports). His consulting work ranges
  from special seismic design of bridges\, buildings\, retaining walls\, me
 tro stations and tunnels\, to harbor quay walls (all major ports of Greece
 )\, and special design against faulting–induced deformation applying the
  methods he developed during and after his PhD. He is the Associate Editor
  of Frontiers in Earthquake Engineering (Nature Publishing Group)\, Editor
 ial Board Member of Géotechnique and ICE–Geotechnical Engineering\, and
  he has given several Keynote and Invited talks at international conferenc
 es\, as well as academic and industrial institutions. Ioannis is the inaug
 ural recipient of the Young Researcher Award of the ISSMGE in Geotechnical
  Earthquake Engineering\, and winner of the 2012 Shamsher Prakash Research
  Award.\n
LOCATION:Cambridge University Engineering Department\, Lecture Room 2
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