000013075 001__ 13075
000013075 005__ 20161114160326.0
000013075 04107 $$aeng
000013075 046__ $$k2009-06-22
000013075 100__ $$aBasili, M.
000013075 24500 $$aA simplified procedure to estimate base sliding of concrete gravity dams induced by an earthquake

000013075 24630 $$n2.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000013075 260__ $$bNational Technical University of Athens, 2009
000013075 506__ $$arestricted
000013075 520__ $$2eng$$aIn this study a simplified procedure to estimate possible base sliding of concrete gravity dams induced by an earthquake is proposed. A simple mechanical model is developed to take into account the most relevant parameters influencing seismic response such as dam-water and dam-foundation interaction. In order to catch base residual displacement, a threshold value for the sliding foundation resistance is fixed. The dam is modelled as an elastic linear single degree of freedom system. The hydrodynamic effects of the water in the reservoir are taken into account with generalized supplementary mass and force as well as by adding supplementary damping. The foundation resistance is modelled with the Mohr-Coulomb criterion including a frictional and a cohesive component and the presence of a passive wedge resistance is also considered. A comprehensive numerical analysis of the response of concrete gravity dams subjected to several natural earthquake records relative to events mainly happened in Italy is carried out to estimate base residual displacement. Different parameters are considered such as dam height, foundation rock parameters, water level, seismic intensity. As a result a simplified methodology is developed to evaluate base residual displacement, once known dam geometry, response spectrum of the seismic input, and the soil characteristics. The procedure permits to assess seismic safety of the dam with respect to base sliding, as well as water level reduction necessary to render the dam safe enough.

000013075 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000013075 653__ $$aConcrete gravity dam, base sliding, earthquake analysis. Abstract. In this study a simplified procedure to estimate possible base sliding of concrete gravity dams induced by an earthquake is proposed. A simple mechanical model is developed to take into account the most relevant parameters influencing seismic response such as dam-water and dam-foundation interaction. In order to catch base residual displacement, a threshold value for the sliding foundation resistance is fixed. The dam is modelled as an elastic linear single degree of freedom system. The hydrodynamic effects of the water in the reservoir are taken into account with generalized supplementary mass and force as well as by adding supplementary damping. The foundation resistance is modelled with the Mohr-Coulomb criterion including a frictional and a cohesive component and the presence of a passive wedge resistance is also considered. A comprehensive numerical analysis of the response of concrete gravity dams subjected to several natural earthquake records relative to events mainly happened in Italy is carried out to estimate base residual displacement. Different parameters are considered such as dam height, foundation rock parameters, water level, seismic intensity. As a result a simplified methodology is developed to evaluate base residual displacement, once known dam geometry, response spectrum of the seismic input, and the soil characteristics. The procedure permits to assess seismic safety of the dam with respect to base sliding, as well as water level reduction necessary to render the dam safe enough.

000013075 7112_ $$aCOMPDYN 2009 - 2nd International Thematic Conference$$cIsland of Rhodes (GR)$$d2009-06-22 / 2009-06-24$$gCOMPDYN2009
000013075 720__ $$aBasili, M.$$iNuti, C.
000013075 8560_ $$ffischerc@itam.cas.cz
000013075 8564_ $$s331602$$uhttps://invenio.itam.cas.cz/record/13075/files/CD101.pdf$$yOriginal version of the author's contribution as presented on CD, section: Seismic analysis of special structures.
000013075 962__ $$r13074
000013075 980__ $$aPAPER