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SUMMARY:Advanced computational models for structural mechanics
DTSTART:20150501T121500
DTEND:20150501T131500
DTSTAMP:20260406T124144Z
UID:d8b9722c3456dddac74df219d86dd6083d3a679e6359cd8f87c5faf4
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Dr Mohammed HJIAJ\, INSA Rennes\, France\nDevising pract
 ical design rules requires both experimental results and rigorous computat
 ional models that are first validated and next used to explore other situa
 tions by performing extensive parametric study that cover all possible cas
 es. This presentation will touch on two very different problems (buckling 
 of hybrid columns and impact of steel beam) and show how computational mod
 els can be used to derive design rules particularly for problems where tes
 ts are expensive. \nThe first part of the talk deals with numerical inves
 tigations on second-order effects in slender RC columns reinforced by seve
 ral steel sections\, namely hybrid columns\, subjected to combined axial l
 oad and uniaxial bending moment. New expressions for the correction factor
 s involved in the determination of the effective flexural stiffness EI are
  proposed and calibrated by the results of the extended parametric study w
 ith 2960 data sets.\nIn the second part of the talk\, we develop a computa
 tional model for the analysis of a column impacted by a projectile. The fo
 rmulation of impact problems can be divided into two groups: smooth and no
 n-smooth approaches\, which we will compare. For both formulations\, we us
 e a newly developed energy-momentum time integration scheme to ensure cons
 ervation of the total energy and the momentum of the system during and aft
 er the impact.\nBio : Professor Mohammed HJIAJ is head of the Structural E
 ngineering Research Group at INSA de Rennes (FRANCE). He graduated with ho
 nors from Ecole Centrale des Arts & Métiers (Brussels) in 1990 with a B.S
 . in Civil Engineering. He obtained an M.Sc. degree in Mechanics of Solids
  and Structures from Faculté Polytechnique de Mons (Belgium) in 1992. In 
 1994\, he joined the Civil Engineering Department at Ecole des Mines de Do
 uai in France as a lecturer. There he conducted research on computational 
 plasticity\, error analysis and adaptive strategies. After receiving his P
 h.D. degree from Faculté Polytechnique de Mons in 1999 with the highest d
 istinction\, he joined the CNRS as a Research Scientist\, where he pursued
  research on computational mechanics dealing with non-smooth problems. In 
 Fall 2000\, he moved to the University of Newcastle (Australia) where he p
 ursued research on computational limit and shakedown analysis with applica
 tion to foundation engineering and soil-structure interaction. In 2002\, h
 e was awarded the Australian Post-Doctoral Fellowship from the Australian 
 Research Council to work on a variety of topics related to computational g
 eomechanics. In September 2004\, he was appointed Professor at INSA de Ren
 nes\, where he conducts experimental and computational research on steel a
 nd composite steel-concrete structures\, including seismic behavior and ro
 bustness. He serves on various technical committees within the ECCS\, is o
 n the editorial board of the French journal Construction Métallique and a
 n associate editor for the ASCE Journal of Structural Engineering.\nThe Gr
 oup research ID:\nThe Structural Engineering Research Group has a long tra
 dition of research in steel and composite structures. Much of our research
  projects involve a combination of experimental\, theoretical and computat
 ional work. The group has extensive expertise and knowledge in both comput
 ational structural mechanics including its theoretical foundations and adv
 anced testing of structures. Over the years\, the group was at the forefro
 nt of developing Finite elements for high nonlinear and sophisticated stru
 ctural problems able to closely reproduce the behavior of structure as obs
 erved experimentally with the aim to provide engineers with appropriate to
 ols for advanced design (pre-normative research). Elastic and inelastic ti
 me-independent as well as time-dependent problems have been addressed.
LOCATION:GC B3 30 http://plan.epfl.ch/?lang=fr&room=GCB330
STATUS:CONFIRMED
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