000013247 001__ 13247
000013247 005__ 20161114160333.0
000013247 04107 $$aeng
000013247 046__ $$k2009-06-22
000013247 100__ $$aSantafe, B.
000013247 24500 $$aRate dependent moment-curvature relations for the progressive collapse analysis of rc structures

000013247 24630 $$n2.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000013247 260__ $$bNational Technical University of Athens, 2009
000013247 506__ $$arestricted
000013247 520__ $$2eng$$aThis contribution deals with the modeling of reinforced concrete structures in the context of progressive collapse simulations. Depending on the initial triggering event, the progressive collapse phenomenon may involve high strain rates in structural members. Since the behaviour of concrete is sensitive to the strain rate, a numerical representation of the strain rate effects on the material behaviour is needed. A Perzyna viscoplastic model is adopted to couple strain rate effects to the plastic response for both concrete and steel, leading to an increase in the flow properties with respect to the strain rate. The rate dependence in the elastic domain is also accounted for. The parameters of the constitutive laws for concrete and steel have been chosen in such a way that the dynamic increase factors (DIF) -i.e. the ratio of dynamic to static strength- obtained with the proposed constitutive models are in good agreement with the experimental results available in the literature. The introduction of these one-dimensional constitutive laws for concrete and steel in a perfectly-bonded layered beam model provides strain rate dependent relations between the bending moment and the curvature for given RC cross-sections. This multilevel approach is used to compare the structural response of a planar frame subjected to the loss of a vertical load bearing element using rate independent material laws with the one obtained through rate dependent ones.

000013247 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000013247 653__ $$aProgressive Collapse, RC structures, strain rate effects, viscoplastic model, layered beam. Abstract. This contribution deals with the modeling of reinforced concrete structures in the context of progressive collapse simulations. Depending on the initial triggering event, the progressive collapse phenomenon may involve high strain rates in structural members. Since the behaviour of concrete is sensitive to the strain rate, a numerical representation of the strain rate effects on the material behaviour is needed. A Perzyna viscoplastic model is adopted to couple strain rate effects to the plastic response for both concrete and steel, leading to an increase in the flow properties with respect to the strain rate. The rate dependence in the elastic domain is also accounted for. The parameters of the constitutive laws for concrete and steel have been chosen in such a way that the dynamic increase factors (DIF) -i.e. the ratio of dynamic to static strength- obtained with the proposed constitutive models are in good

000013247 7112_ $$aCOMPDYN 2009 - 2nd International Thematic Conference$$cIsland of Rhodes (GR)$$d2009-06-22 / 2009-06-24$$gCOMPDYN2009
000013247 720__ $$aSantafe, B.$$iMassart T., J.$$iBouillard, P.$$iVantomme, J.
000013247 8560_ $$ffischerc@itam.cas.cz
000013247 8564_ $$s1281347$$uhttps://invenio.itam.cas.cz/record/13247/files/CD368.pdf$$yOriginal version of the author's contribution as presented on CD, section: Progress and challenges in collapse prediction - i (MS).
000013247 962__ $$r13074
000013247 980__ $$aPAPER