Volume 5, Issue 2 (June 2007)
IJCE 2007, 5(2): 93-103 |
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Haddad A, Shafabakhsh G. Non-invasive Continuous Surface Wave Measurements for In Situ Damping Ratio Profiling of Soils. IJCE 2007; 5 (2) :93-103
URL: http://ijce.iust.ac.ir/article-1-316-en.html
URL: http://ijce.iust.ac.ir/article-1-316-en.html
Abstract: (34690 Views)
Local site conditions have a strong effect on ground response during earthquakes. Two
important soil parameters that control the amplification effects of seismic motions by a soil column
are the soil hysteretic damping ratio and shear wave velocity. This paper presents the results of in
situ damping ratio measurements performed using continuous surface wave attenuation data at a
site in Semnan University campus and analysis used to obtain the near surface soils damping ratio
profile. Once the frequency dependent attenuation coefficients are determined, the shear damping
ratio profile is calculated using an algorithm based on constrained inversion analysis. A computer
code is developed to calculate the shear damping ratio in each soil layer. Comparisons of the in situ
shear damping ratio profile determined from continuous surface wave with cross hole independent
test measurements are also presented. Values of shear damping ratio, obtained using continuous
surface wave measurements, were less than the measured using cross hole tests, possibly because
of the higher frequencies used in cross hole tests.
Type of Study: Technical Note |
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