Effects of oblique incident wave time history determination method based on design ground motion on seismic response of earth-rock dam

被引：0

作者：

Wang F. ^{[1
]}

Song Z. ^{[1
]}

Liu Y. ^{[1
]}

Zhang J. ^{[2
]}

机构：

[1] State Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi'an University of Technology, Xi'an

[2] China Three-Gorge Projects Development Co., Ltd., Chengdu

来源：

Zhendong yu Chongji/Journal of Vibration and Shock | 2021年 / 40卷 / 19期

关键词：

Design ground motion; Earth-rock dam; Free-field; Seismic response; Time history of oblique incident wave;

D O I：

10.13465/j.cnki.jvs.2021.19.011

中图分类号：

学科分类号：

摘要：

The oblique incident wave time history determination method based on design ground motion has significant influences on seismic response of earth-rock dam. Here, this common method and its applicability were analyzed to obtain time histories of oblique incident P and SV waves using 1/2 amplitude modulation of horizontal design ground motion of homogeneous rock body on flat ground surface. On the premise of oblique incidence combined P wave and SV wave, considering the joint action of the two waves on free field of semi-infinite space, the expression of free field response component at any point in the space was established. Based on the principle of free field response component of control point being the same as the design ground motion component, the functional relationship between time history of incident wave and incident angle was established. A method to determine time history of incident wave based on 2D design ground motion was proposed. The deviation between the ground surface free field response of semi-infinite space and seismic response of bed rock-overburden-earth rock dam system relative to the proposed method was analyzed when time history of oblique incident wave was determined according to the assumption of vertical incidence. The results showed that under any non-vertical incidence angle, free field response of control point deviates from design ground motion more seriously, and the change law of acceleration of earth rock dam crest with incidence angle contains the contribution of ground motion intensity variation, but it is not the result under action of design ground motion; the ground surface free field displacements obtained with the proposed method agree well with horizontal and vertical components of design ground motion, and can correctly reflect the non-uniform motion caused by oblique incidence angle; effects of oblique incidence angle on seismic response of earth rock dam can be analyzed on the premise of keeping design ground motion intensity unchanged. © 2021, Editorial Office of Journal of Vibration and Shock. All right reserved.

引用

页码：80 / 88

页数：8

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