000013268 001__ 13268
000013268 005__ 20161114160334.0
000013268 04107 $$aeng
000013268 046__ $$k2009-06-22
000013268 100__ $$aElachachi S., M.
000013268 24500 $$aStructural reliability of buried networks in a heterogeneous and aleatory environment subjected to seismic actions

000013268 24630 $$n2.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000013268 260__ $$bNational Technical University of Athens, 2009
000013268 506__ $$arestricted
000013268 520__ $$2eng$$aDysfunctions and failures of buried pipe networks like sewer networks are studied from the point of view of the heterogeneity of geotechnical conditions in the longitudinal direction and of the applied action (seismic action). Combined soil defects (differential settlements along the pipe, landslides, voids surrounding the pipe, etc.) and peak ground acceleration (PGA) induce stresses (which leads to an ultimate limit state ULS) and displacements (which constitute a violation of a serviceability limit state SLS). It is remarkable to note that the influence of the variability of the soil is not reflected in current European standards. A model has been developed which includes a description of the soil spatial variability, within the frame of geostatistics, where the correlation length of soil properties is the main parameter and a mechanical description of the soil–structure interaction of a set of buried pipes with flexible connections resting on the soil by a two parameter model (Pasternak model). Reliability analysis is performed on the sewer by using a surface response model (RSM), with the index reliability coefficient being calculated for two limit states: Serviceability limit state, corresponding to a two large “counterslope” in a given pipe, which can prevent the normal flow of fluids, and Ultimate limit state, corresponding to a too large bending moment, thus bending stress, which can cause crack in the pipes. The response in time domain of a buried pipe submitted to a random ground motion and by taking into account a longitudinal variability of the properties of the soil is modeled. Several conclusions are drawn: Soil heterogeneity induces effects (differential settlements, bending moments, stresses and possible cracking) that cannot be predicted if homogeneity is assumed and the magnitude of the induced stresses depends mainly on four factors: the soilstructure length ratio, which combines the soil fluctuation scale and a structural characteristic length (buried pipe length), a magnitude of the soil variability (i.e. its coefficient of variation), a soil-structure stiffness ratio, and a structure-connection stiffness ratio (relative flexibility).

000013268 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000013268 653__ $$aEarthquake, Soil–structure interaction, Random field, RSM, pipes. Abstract. Dysfunctions and failures of buried pipe networks like sewer networks are studied from the point of view of the heterogeneity of geotechnical conditions in the longitudinal direction and of the applied action (seismic action). Combined soil defects (differential settlements along the pipe, landslides, voids surrounding the pipe, etc.) and peak ground acceleration (PGA) induce stresses (which leads to an ultimate limit state ULS) and displacements (which constitute a violation of a serviceability limit state SLS). It is remarkable to note that the influence of the variability of the soil is not reflected in current European standards. A model has been developed which includes a description of the soil spatial variability, within the frame of geostatistics, where the correlation length of soil properties is the main parameter and a mechanical description of the soil–structure interaction of a set of buried pipes with flexible connections resting on the soil by a two parameter model (Pasternak model). Reliability analysis is performed on the sewer by using a surface response model (RSM), with the index reliability coefficient being calculated for two limit states: Serviceability limit state, corresponding to a two large “counterslope” in a given pipe, which can prevent the normal flow of fluids, and Ultimate limit state, corresponding to a too large bending moment, thus bending stress, which can cause crack in the pipes. The response in time domain of a buried pipe submitted to a random ground motion and by taking into account a longitudinal variability of the properties of the soil is modeled. Several conclusions are drawn: Soil heterogeneity induces effects (differential settlements, bending moments, stresses and possible cracking) that cannot be predicted if homogeneity is assumed and the magnitude of the induced stresses depends mainly on four factors: the soilstructure length ratio, which combines the soil fluctuation scale and a structural characteristic length (buried pipe length), a magnitude of the soil variability (i.e. its coefficient of variation), a soil-structure stiffness ratio, and a structure-connection stiffness ratio (relative flexibility).

000013268 7112_ $$aCOMPDYN 2009 - 2nd International Thematic Conference$$cIsland of Rhodes (GR)$$d2009-06-22 / 2009-06-24$$gCOMPDYN2009
000013268 720__ $$aElachachi S., M.$$iBreysse, D.$$iBenzeguir, H.
000013268 8560_ $$ffischerc@itam.cas.cz
000013268 8564_ $$s150830$$uhttps://invenio.itam.cas.cz/record/13268/files/CD401.pdf$$yOriginal version of the author's contribution as presented on CD, section: Statistical and probabilistic methods in computational mechanics to treat aleatory and epistemic uncertainties in structural and/or geotechnical systems and their loading environment - ii (MS).
000013268 962__ $$r13074
000013268 980__ $$aPAPER