000022044 001__ 22044
000022044 005__ 20170622145953.0
000022044 04107 $$aeng
000022044 046__ $$k2015-05-25
000022044 100__ $$aIsrailov, Mukhady
000022044 24500 $$aLONGITUDINAL SEISMIC VIBRATIONS OF A SEGMENTED PIPELINE CONSIDERED AS THE PERIODICALLY INHOMOGENEOUS ROD

000022044 24630 $$n5.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000022044 260__ $$bNational Technical University of Athens, 2015
000022044 506__ $$arestricted
000022044 520__ $$2eng$$aUnderground segmented pipeline with flexible joints is considered as a periodically piecewise homogeneous rod. Longitudinal vibrations of the rod are investigated by utilizing E.A. Ilyushina's method which reduces this problem to vibration study of separation boundaries between homogeneous parts of the rod. In this way, the averaged differential equations of motion and the average wave velocities are obtained for inhomogeneous rod when its cell of periodicity contains two, three, and more elastic components. It is shown that the average velocities are the same as the ones calculated through effective static moduli of the composite rod. The iron/steel pipelines with rubber and lead rings at joints are considered as examples. In these examples the average wave velocities in segmented pipeline (calculated by the method mentioned above) are significantly less than the wave velocity in the iron/steel pipe itself. The last result justifies the necessity of supersonic case study (the case in which wave velocity in the pipe less than seismic wave velocity in the soil) when earthquake response of buried pipelines is investigated. Usually this case is ignored assuming that the wave velocity in the pipe exceeds the wave velocity in the soil. The results of this paper clearly demonstrate that for segmented pipeline this assumption may not be true.

000022044 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000022044 653__ $$aseismic vibrations, underground pipeline, periodically inhomogeneous rod, flexible joints.

000022044 7112_ $$aCOMPDYN 2015 - 5th International Thematic Conference$$cCrete (GR)$$d2015-05-25 / 2015-05-27$$gCOMPDYN2015
000022044 720__ $$aIsrailov, Mukhady
000022044 8560_ $$ffischerc@itam.cas.cz
000022044 8564_ $$s496275$$uhttps://invenio.itam.cas.cz/record/22044/files/C1067.pdf$$yOriginal version of the author's contribution as presented on CD, section: 
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000022044 962__ $$r22030
000022044 980__ $$aPAPER