000013583 001__ 13583
000013583 005__ 20161114165847.0
000013583 04107 $$aeng
000013583 046__ $$k2011-05-25
000013583 100__ $$aMazza, F.
000013583 24500 $$aNonlinear Modeling and Analysis of R.C. Spatial Frames to Study the Effects of the Vertical Component of Near-Fault Ground Motions

000013583 24630 $$n3.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000013583 260__ $$bNational Technical University of Athens, 2011
000013583 506__ $$arestricted
000013583 520__ $$2eng$$aNear-fault ground motions are characterized by high values of the ratio PGA between the peak value of the vertical acceleration, PGAV, and the analogous value of the horizontal acceleration, PGAH, which can notably modify the axial force demand in columns (e.g. producing both tension and high compressive forces larger than the balanced force) and the bending moment demand in girders (e.g. plastic hinges are expected along the span of r.c. girders, especially in the upper storeys). At present, the Italian seismic code (NTC08) does not consider the effects of near-fault ground motions in the design of a r.c. framed structure. In order to check the effectiveness of current code provisions, six- and twelve-storey r.c. spatial framed structures are designed according to the provisions of NTC08, considering the horizontal seismic loads acting alone or in combination with the vertical ones. A numerical investigation is carried out considering the nonlinear response of the test structures subjected to horizontal and vertical accelerograms, representative of near-fault ground motions with different values of the acceleration ratio PGA. A lumped plasticity model (LPM) based on the Haar-Kàrmàn principle is proposed to model the inelastic behaviour of the r.c. frame members. Specifically, the lumped plasticity model for a column (LPMC) includes a piecewise linearization of the bounding surface of the axial load-biaxial bending moment elastic domain, at the end sections where inelastic deformations are expected. On the other hand, the lumped plasticity model for a girder (LPMG) takes into account the potential plastic hinges along the span, due to the vertical ground motion, modifying the uniaxial plastic moments of the endsections and so avoiding the computational effort required by the sub-discretization of the frame member.

000013583 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000013583 653__ $$aR.C. Spatial Frames, Lumped Plasticity Model, Axial Load-Biaxial Bending, Nonlinear Dynamic Analysis, Near-Fault Ground Motions.

000013583 7112_ $$aCOMPDYN 2011 - 3rd International Thematic Conference$$cIsland of Corfu (GR)$$d2011-05-25 / 2011-05-28$$gCOMPDYN2011
000013583 720__ $$aMazza, F.$$iMazza, M.
000013583 8560_ $$ffischerc@itam.cas.cz
000013583 8564_ $$s293798$$uhttps://invenio.itam.cas.cz/record/13583/files/322.pdf$$yOriginal version of the author's contribution as presented on CD, section: MS 04 Advances in Numerical Methods for Linear and Nonlinear Dynamics.
000013583 962__ $$r13401
000013583 980__ $$aPAPER