One-dimensional seismic response of two-layer soil deposits with shear wave velocity inversion

被引:0
|
作者
Ding, YuQin [1 ]
Pagliaroli, Alessandro [1 ]
Lanzo, Giuseppe [1 ]
机构
[1] Univ Roma La Sapienza, Dipartimento Ingn Strutturale & Geotecn, I-00197 Rome, Italy
来源
2008 SEISMIC ENGINEERING CONFERENCE COMMEMORATING THE 1908 MESSINA AND REGGIO CALABRIA EARTHQUAKE, PTS 1 AND 2 | 2008年 / 1020卷
关键词
two-layer deposit; soft soil; stiff soil; shear wave velocity inversion; site response; linear and equivalent linear analyses;
D O I
暂无
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
The paper presents the results of a parametric study with the purpose of investigating the ID linear and equivalent linear seismic response of a 30 meters two-layer soil deposits characterized by a stiff layer overlying a soft layer. The thickness of the soft layer was assumed equal to 0.25, 0.5 and 0.75H, being H the total thickness of the deposit. The shear wave velocity of the soft layer was assumed equal to V(s)=90 and 180 m/s while for the stiff layer V(s)=360, 500 and 700 m/s were considered. Six accelerograms extracted by an Italian database characterized by different predominant periods ranging from 0.1 to 0.7s were used as input outcropping motion. For the equivalent liner analyses, the accelerograms were scaled at three different values of peak ground acceleration (PGA), namely 0.1, 0.3 and 0.5g. The numerical results show that the two-layer ground motion is generally deamplified in terms of PGA with respect to the outcrop PGA. This reduction is mainly controlled by the shear wave velocity of the soft layer, being larger for lower V. values, by the amount of nonlinearity experienced by the soft soil during the seismic shaking and, to a minor extent, by the thickness of the soft soil layer.
引用
收藏
页码:252 / 259
页数:8
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