SEISMOLOGICAL EVIDENCE FOR NONLINEAR ELASTIC GROUND BEHAVIOR DURING LARGE EARTHQUAKES

被引:41
作者
BERESNEV, IA
WEN, KL
YEH, YT
机构
[1] Institute of Earth Sciences, Academia Sinica, Nankang, Taipei 11529
关键词
STRONG MOTION; SOIL AMPLIFICATION; SHEAR WAVE VELOCITY; NONLINEAR DEFORMATION; ELASTIC HYSTERESIS;
D O I
10.1016/0267-7261(94)00036-G
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
Amplification of earthquake-induced seismic waves by soft superficial deposits often causes significant damages in the urban areas. In predicting this effect for large future earthquakes, the linear elastic response of soils is customarily assumed. To check this assumption, we have analyzed surface and downhole acceleration data from the SMART1 and SMART2 strong motion arrays in Taiwan, covering peak accelerations of up to 0.3 g. First, frequency-dependent amplification induced by the alluvial deposits at the SMART1 array was estimated using spectral ratio technique, where the records at rock site were taken as a reference motion. Statistically validated reduction in soil amplification in the strong motion relative to the weak motion in the frequency range between approximately 1 and 9 Hz was detected. Secondly, relative site responses between the Pleistocene and recent sedimentary deposits at the SMART2 array were studied. Relative amplification was shown to be clearly dependent on the excitation level. Thirdly, we compared experimentally recorded uphole/downhole spectral ratios on weak and strong ground motion with the theoretical response yielded by the geotechnical code DESRA2 which assumes hysteretic constitutive relationship of soil. Major symptoms of nonlinear ground behavior predicted by the model were found in the observed data. Back-calculation of the shear wave velocities to the depth of 47 m shows nearly 50% decrease in the strongest quakes, also accounted for by the nonlinear soil behavior.
引用
收藏
页码:103 / 114
页数:12
相关论文
共 41 条
[1]  
Abrahamson N. A., 1987, EARTHQ SPECTRA, V3, P263, DOI [10.1193/1.1585428, DOI 10.1193/1.1585428]
[2]   LOCAL SITE EFFECTS ON WEAK AND STRONG GROUND MOTION [J].
AKI, K .
TECTONOPHYSICS, 1993, 218 (1-3) :93-111
[3]  
AKI K, 1988, ASCE GEOTECHNICAL SP, P103
[4]  
AKI K, 1991, 4TH P INT C SEISM ZO, V1, P61
[5]  
Beresnev I. A., 1986, Izvestiya Academy of Sciences USSR, Physics of the Solid Earth, V22, P804
[6]   EXPERIMENTAL INVESTIGATIONS OF NONLINEAR SEISMIC EFFECTS [J].
BERESNEV, IA ;
NIKOLAEV, AV .
PHYSICS OF THE EARTH AND PLANETARY INTERIORS, 1988, 50 (01) :83-87
[7]   SOURCE, PATH AND SITE EFFECTS ON DOMINANT FREQUENCY AND SPATIAL VARIATION OF STRONG GROUND MOTION RECORDED BY SMART1 AND SMART2 ARRAYS IN TAIWAN [J].
BERESNEV, IA ;
WEN, KL ;
YEH, YT .
EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS, 1994, 23 (06) :583-597
[8]  
BOORE DM, 1983, B SEISMOL SOC AM, V73, P1865
[9]  
BORCHERDT RD, 1992, B SEISMOL SOC AM, V82, P603
[10]  
Celebi M., 1987, EARTHQ SPECTRA, V3, P315