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SUMMARY:Dynamic Soil-Structure-Interaction: Behaviour of Shallow Foundatio
 ns - Charles Heron\, CUED
DTSTART:20130321T170000Z
DTEND:20130321T180000Z
UID:TALK42113@talks.cam.ac.uk
CONTACT:Anama Lowday
DESCRIPTION:Current design codes strive to minimise the rocking and slidin
 g movements of shallow foundations during seismic loading despite much res
 earch indicating the beneficial nature of allowing such movements. The pri
 mary benefit is the partial isolation of the foundation from the soil bene
 ath which leads to a reduced ductility demand on the superstructure\, decr
 eased risk of collapse and a more cost effective design. However\, further
  research is required in order to be able to fully model and predict the b
 ehaviour of the soil-foundation interface when sliding and rocking are per
 mitted. \nIn this presentation\, the results from a series of centrifuge t
 ests which were conducted to investigate the response of shallow foundatio
 ns located on dry sand and subjected to dynamic loading will be presented.
  A range of parameters were varied including\; relative density\, bearing 
 pressure\, aspect ratio\, structural stiffness\, earthquake magnitude and 
 earthquake frequency. Through instrumentation arrays within the soil and o
 n the structure\, combined with high-speed photography\, the response of t
 he structure and soil were monitored. This data allows the dynamic respons
 e of the soil-foundation interface to be analysed and understood by examin
 ation of settlement-rotation and moment-rotation plots. Finally\, a new an
 alytical model will be proposed which is capable of representing the momen
 t-rotation behaviour.\n
LOCATION:Engineering Department - Lecture Room 6
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