Study on the Influence of Underground Structure on Peak Ground Acceleration
The existence of underground structure has a great influence on the propagation path of ground motion,which mainly manifested in changing the ground motion characteristics on the surface,and the adjacent buildings built on the surface will generate complex earthquake response.Based on soil-structure model with rectangular underground structure and a free field model,combined with the defined surface horizontal peak acceleration amplification coefficient,the effects of buried depth,elastic modulus of underground structure and earthquake motion frequency on the amplitude of surface horizontal acceleration in soil-structure model are studied.The results show that there is an obvious peak point of amplification coefficient on the surface at the distance of 0.5～1.5 times the width of the underground structure from the side of the structure.Increasing the buried depth of underground structure is conducive to reducing the influence of underground structure on surface acceleration.The amplification coefficient of surface horizontal acceleration increases gradually with the increase of structural elastic modulus.Low frequency earthquake motion has little effect on ground surface acceleration;however,the effect of high frequency earthquake motion is significant.
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