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SUMMARY:Behavior of Reinforced Concrete Elements subjected to Tri-Directio
 nal Loads
DTSTART:20151016T121500
DTEND:20151016T131500
DTSTAMP:20261001T230346Z
UID:03bacd711d1725a01e60294fcd6afbbde029e49815b78a59e310a10d
CATEGORIES:Conferences - Seminars
DESCRIPTION:Ashraf Ayoub\, Ph.D.\, P.E.\, FACI\, Royal Academy of Engineer
 ing Chair and Professor\, City University London\nThe two-dimensional desi
 gn and behavior of typical reinforced concrete (RC) structures has been ex
 tensively studied in the past several decades. Such design requires knowle
 dge of the constitutive behavior of reinforced concrete elements subjected
  to a biaxial state of stress. These constitutive models were accurately d
 erived from experimental test data on representative reinforced concrete p
 anel elements. The true behavior of many large complex structures however\
 , requires knowledge of the constitutive laws of RC elements subjected to 
 a triaxial state of stress. The goal of the proposed work is to develop ne
 w constitutive relations for RC elements subjected to a triaxial state of 
 stress. To accomplish this task\, large-scale tests on representative conc
 rete panels need to be performed. An experimental program was conducted us
 ing a state of the art panel tester in order to evaluate the behavior of r
 einforced concrete elements subjected to tri-directional loads. The result
 s of several full scale RC elements subjected to tri-directional shear loa
 ds are discussed. The tests revealed that the application of out-of-plane 
 shear loads clearly reduced the in-plane shear strength. Based on these re
 sults\, an interaction diagram between the three tri-directional shear str
 esses acting on a reinforced concrete element was developed. An element-ba
 sed approach was then adopted in which these constitutive relations were i
 ntegrated using the finite element method to predict the overall behavior 
 of the entire structure. The newly developed three-dimensional finite elem
 ent model is based on mixed fiber beam-column formulations\, in which the 
 new constitutive laws are accounted for at the fiber level. The model is c
 urrently being extended to account for different material and geometric no
 nlinear effects. The presentation concludes with correlation studies of RC
  columns subjected to three-dimensional static and dynamic loads. Theses s
 tudies proved the newly developed model can provide reasonable estimates w
 hen compared to experimental results.\nBio : Prof. Ayoub holds the Royal A
 cademy of Engineering Pell Frischmann Chair of Nuclear Infrastructure at C
 ity University London\, UK. He obtained his MSc and Ph.D. in Civil Enginee
 ring from the University of California-Berkeley and was a Post-Doctoral fe
 llow at Stanford University. He is a Fellow of the American Concrete Insti
 tute\; a past chair of Joint ACI-ASCE Committee 447\, Finite Element Analy
 sis of Reinforced Concrete Structures\, and the ASCE committee on Emerging
  Computing Technologies. He currently serves as associate editor for the J
 ournal of Structural Engineering\, ASCE. His current research is in the fi
 eld of design and analysis of nuclear infrastructure systems\, nonlinear f
 inite element analysis\, constitutive modeling of materials through experi
 mental and analytical techniques\, earthquake engineering\, and design of 
 Fiber Reinforced Polymer composite systems. He was previously on the facul
 ty at the University of Houston and the University of Missouri-Rolla\, USA
 .
LOCATION:GC C3 30 http://plan.epfl.ch/?lang=fr&room=GCC330
STATUS:CONFIRMED
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