000013618 001__ 13618
000013618 005__ 20161114165848.0
000013618 04107 $$aeng
000013618 046__ $$k2011-05-25
000013618 100__ $$aZania, V.
000013618 24500 $$aDynamic Interaction of Slip Displacement Accumulation in a Two-Block Newmark Model

000013618 24630 $$n3.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000013618 260__ $$bNational Technical University of Athens, 2011
000013618 506__ $$arestricted
000013618 520__ $$2eng$$aEngineering structures commonly include distinct interfaces or discontinuities, which attain low shear strength. The presence of these interfaces has been acknowledged to substantially modify the dynamic response of engineering structures. The main mechanism that dominates their response is the accumulation of permanent displacements (slip) along the interface. A well known approach to estimate the accumulated slippage is the Newmark’s sliding block model [1], in which displacements are derived via the double integration of the relative acceleration, which is obtained after the formulation of the differential equations governing the equilibrium along the sliding plane. However, in many cases in engineering practice more than one potentially sliding planes may be developed. These may be discontinuities or predefined interfaces, or failure planes within a continuum (like soil). Some representative examples are: (a) earth dams or soil embankments where the first sliding plane is along their base [2] and the other develops due to soil yielding, (b) waste landfills, where the inclusion of geosynthetics provides more than one sliding planes, (c) geosynthetically reinforced slopes or gabion walls, (d) columns and pillars comprising of stacked rigid blocks (e) foundation of machinery equipment, and (f) base isolation systems. In the current study a new model was developed, which is based on the principles of Newmark’s sliding block approach. This model comprises of three rigid blocks separated by predefined interfaces of finite shear strength. A semi-analytical procedure was followed and the validity of the method was verified by finite element analyses of the corresponding model. In addition, parametric analyses were performed in order to address the impact of the main parameters involved. The interaction of the slip displacement accumulation along the two interfaces appears to be a rather complicated mechanism. It is shown, that taking into account the effect of the interaction leads to a reduction of the displacements along both interfaces. However, the interaction mechanism is dominated by the inclination of the sliding planes, the mass ratio of the two blocks, the ratio of the yield acceleration of the two interfaces and the angle of friction of the lower interface. It is also proven that the excitation characteristics do not affect substantially the interaction mechanism, expressed as the ratio of the slip displacements of the two blocks, but only the absolute magnitude of the slippage. References [1] N.M. Newmark, Effect of earthquakes on dams and embankments. Geotechnique, 15 (2), 139160, 1965. [2] A.K.Chopra and L. Zhang, Earthquake-induced base sliding on concrete gravity dams. Journal of Structural Engineering, 117 (12), 3698-3719, 1991.

000013618 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000013618 653__ $$a

000013618 7112_ $$aCOMPDYN 2011 - 3rd International Thematic Conference$$cIsland of Corfu (GR)$$d2011-05-25 / 2011-05-28$$gCOMPDYN2011
000013618 720__ $$aZania, V.$$iTsompanakis, Y.$$iPsarropoulos, P.
000013618 8560_ $$ffischerc@itam.cas.cz
000013618 8564_ $$s10486$$uhttps://invenio.itam.cas.cz/record/13618/files/385.pdf$$yOriginal version of the author's contribution as presented on CD, section: RS 12 Computational Methods in Geotechnical Earthquake Engineering.
000013618 962__ $$r13401
000013618 980__ $$aPAPER