Release Time:2019-03-11  Hits:

Indexed by: Conference Paper

Date of Publication: 2014-05-24

Included Journals: Scopus、CPCI-S、EI

Volume: 580-583

Page Number: 1639-1644

Key Words: phase velocity; dispersion; simplified dispersion curve; Love wave; rotational motion; stiffness matrix

Abstract: In the simulation of the rotational seismic ground motion, the apparent velocity of Love wave is always assumed to be equal to the S wave velocity of top layer of the site approximately, with the dispersion of surface wave not being fully considered. In this paper, the effect of the velocity structure to the Love wave dispersion is discussed based on the stiffness matrix theory. It shows that to assume the velocity to be equal to the S wave velocity of the top layer may greatly overestimate the low frequency rotational seismic motion. A simplified dispersion curve, is suggested for rotational seismic ground motion simulation. The shape of the bilinear curve is shaped by 3 parameters. They are the corner frequency, the minimum phase velocity and the velocity ratio. The parameters are affected by the velocity structure of the site.