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Bulletin of the Seismological Society of America; May 2009; v. 99; no. 2B; p. 1483-1485; DOI: 10.1785/0120080252
© 2009 Seismological Society of America
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Short Notes

Rotational Seismic Load Definition in Eurocode 8, Part 6, for Slender Tower-Shaped Structures

Zbigniew Zembaty

Opole University of Technology, ul.Mikolajczyjka 5, 45-271 Opole, Poland z.zembaty{at}po.opole.plwww.zet.po.opole.pl

This note describes the rotational seismic load definition as included in Part 6 of Eurocode 8 (EC8.6, 2005). The Eurocode 8, Part 6 (EC8.6, 2005), definition of the rotational ground-motion component depends upon the structural subsoil compliance, which is controlled by the shear-wave velocity in the top 30 m of ground. A comparison of the effects of the rocking ground motion and the horizontal ground motion on the response of a 160 m reinforced concrete chimney shows that for the Eurocode 8, Part 6 (EC8.6, 2005), definition of the rotational seismic ground motion, the rocking excitations contribute significantly to the overall response of the structure. The engineering code formulas for the rocking component of ground motion, however, should be calibrated and reconciled with the results of the latest empirical research.




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