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SUMMARY:A centrifuge investigation of two different soil-structure systems
  with rocking and sliding on dense sand - Iason Pelekis\, Engineering Depa
 rtment
DTSTART:20170317T153000Z
DTEND:20170317T160000Z
UID:TALK71610@talks.cam.ac.uk
CONTACT:Karen Mitchell
DESCRIPTION:Seismic protection of structures by means of rocking isolation
  is becoming increasingly popular\, because allowing uplift is an inexpens
 ive way to reduce structural demand. However\, understanding the role of s
 oil–structure interaction in the response of rocking systems is importan
 t to define what type of rocking system might be most effective. To addres
 s this challenge\, a campaign based on centrifuge modelling and testing is
  currently ongoing. The primary objective is to assess the force demand th
 at rocking systems experience during their motion. Flexible structures tha
 t rock while stepping on discrete footings (structural rocking) and flexib
 le structures with discrete footings rocking on soil (foundation rocking) 
 are both considered. Following this distinction\, two building models were
  designed with the only difference being the connectivity of the columns t
 o the footings. For structural rocking\, columns were designed to detach a
 nd step on their footings\, while for foundation rocking the footing-colum
 n connection was designed to be rigid. The two building models were tested
  side-by-side in a centrifuge. A second test was also conducted\, where th
 in steel “fuses” were installed in the interface of structural rocking
 \, to further study the allocation of energy dissipation between structura
 l elements and fuses\, and soil medium. The building models were placed on
  the surface of dense sand and then tested using sinusoidal ground motions
  which caused a combination of sliding and rocking. The global response of
  the models in terms of overturning moment and storey shear was investigat
 ed and back validated by obtaining directly the internal loads\, which wer
 e found capped regardless of the extent of rotation. More-over\, the base 
 isolation effect was evident during large amplitude resonant excitations\,
  whereas during a low frequency low amplitude excitation there was no clea
 r benefit of rocking. Finally\, no significant effect was observed in limi
 ting the base shear demand by using the steel fuses.
LOCATION: Cambridge University Engineering Department\, LR6
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