Analysis of terrain effect on the properties of ground motion
Hao Minghui
Zhang Yushan
Abstract：The explicit finite element analysis method combined with the artifi-cial viscous-elastic boundary theory based on the platform ABAQUS is per-formed to evaluate the terrain effects on ground motion (such as the response spectrum,peak acceleration,peak velocity and peak displacement),and the in-fluence of the terrain width on its amplification effects is studied.The results show that the ground motions on the platform are affected most seriously by the topography;in the zero damping conditions,the spectral ratio curves present the characteristics of double peaks,with their values being a higher value of 1 .6 in the long period range of 0 .8-0 .9 s and exceeding 2 in the high-frequency range of 0.08-0.09 s,and the maximum ratio appearing at the midpoint of the platform.For the slope section,as to most natural periods of response spec-trum,the spectral ratios of the vertices are higher than the other surface points on the slope.In addition,in the natural period beyond 0.4 s,the spectral ratios of the spatial points on the slope show some regularity:the closer to the vertex the observation point,the greater the spectral ratio.Spectral ratios of different observation points on the bottom change between spectral ratios corresponding to basic foot point and those to the boundary point,or the artificial boundary point,which is obvious in different frequency bands.The width of terrain im-poses significant influence on its amplification effects on high-frequency compo-nents of ground motion.However,such influence is limited in some range of width,and with the increase of width,the influence of width on the topographic amplification effects becomes weak.In addition,the width of terrain influences the amplification effect on the peak acceleration of ground motion to some ex-tent,while its influences on the amplification effects on the peak ground veloci-ty and peak ground displacement are not distinct.
Keywords：terrain effectproperty of ground motionterrain widthartificial viscous-elastic boundary
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：12( 883-894 )