To study the effect of mountain topography on seismic amplification and meet the seismic design needs of mountain building in practical engineering

taking unimodal protruding topography as an example

dynamic substructure method was introduced to calculate the seismic response of 60 different-size rock bump terrains with slope angle of 30 ~ 60°

bump height of 20 ~ 80 m

and platform width 50 ~ 600 m under the ground motion input

and the seismic response law of amplification of different-size rock bump terrains was obtained. Results show that the dynamic substructure method can greatly improve the computation efficiency while ensuring the computation accuracy. The convex topography has a great influence on the amplification effect of ground motion. The response of ground motion increases constantly from base of slope to slope top

and the amplification effect of the central point of the platform is the largest. With the increase of slope angle and height

the amplification effect of topography on ground motion increases. When the slope angle and slope height remain unchanged and the topographic relief height is relatively small

as the topographic width increases

the seismic amplification effect increases; otherwise

when the bump height is larger

the seismic amplification effect decreases. The increase of topographic relief size leads to the intensification of high frequency response and the decrease of low frequency response peak.