Comments on the paper: ‘Torsional response of structures to obliquely incident seismic SH waves’

1976 ◽  
Vol 4 (6) ◽  
pp. 616-619 ◽  
Author(s):  
Takuji Kobori ◽  
Yuzo Shinozaki ◽  
J. E. Luco
Keyword(s):  
Sh Waves ◽  
Torsional Response ◽  
Obliquely Incident

Torsional response of structures for SH waves: The case of hemispherical foundations

1976 ◽  
Vol 66 (1) ◽  
pp. 109-123
Author(s):  
J. E. Luco
Keyword(s):  
Closed Form Solution ◽  
Form Solution ◽  
Basic Step ◽  
Sh Waves ◽  
Torsional Response ◽  
Obliquely Incident ◽  
Incident Plane ◽  
Interaction Problem ◽  
Plane Sh Wave ◽  
Plane Sh Waves

abstract A study is made of the harmonic torsional response of an elastic structure placed on a rigid hemispherical foundation which is supported on an elastic medium and is subjected to the action of obliquely incident plane SH waves. As a basic step in the solution of the torsion interaction problem, a closed-form solution is obtained for the torsional response of a rigid hemispherical foundation excited externally by a harmonic torque and through the soil by an obliquely incident plane SH wave. Comparisons between the results for a hemispherical foundation with those for a circular plate allow the estimation of the effects that the embedment of the foundation has on the torsional response of the superstructure.

Reflection of SH waves from anisotropic transition layer

1974 ◽  
Vol 64 (6) ◽  
pp. 1979-1991 ◽  
Author(s):  
V. Thapliyal
Keyword(s):  
Reflection Coefficient ◽  
Incident Wave ◽  
Transition Layer ◽  
Seismic Energy ◽  
Considerable Effect ◽  
Anisotropy Factor ◽  
Sh Wave ◽  
Sh Waves ◽  
Obliquely Incident ◽  
Order Discontinuity

abstract The effects of anisotropy on the reflection of SH-waves (horizontally polarized shear waves) from a transition layer are studied. The transition layer is sand-wiched between two isotropic homogeneous half-spaces and is constituted by a medium which is both anisotropic and inhomogeneous. The SH-wave potentials are obtained for an anisotropic inhomogeneous medium in which both the anisotropy factor (ratio of the horizontal rigidity to the vertical rigidity) and vertical velocity vary with depth. An expression for the reflection coefficient of SH waves is obtained when the material mentioned above forms a finite transition zone between two isotropic homogeneous half-spaces. For further generalization, a second-order discontinuity along with the first-order on eis being assumed in the material properties, at the boundaries of the transition layer. The mathematical and numerical analyses show that the anisotropy factor, found at the top of the transition layer (N0/M0) produces considerable effect on the reflection coefficient for an obliquely incident SH wave. It has been noted that the greater the thickness of the transition layer, the greater is the dependence of the reflection coefficient upon the value of the anisotropy (N0/M0). The minima and maxima of the reflection of seismic energy are found dependent on the value of anisotropy. For greater values of the anisotropy, these maxima and minima shift toward the lower values of the wavelength of the propagating wave (or toward the higher values of the thickness of the transition layer). In fact, the values of the reflection coefficient at which these maxima and minima of seismic energy occur are found greater for the higher values of anisotropy. The effects of anisotropy are found more pronounced for the larger angles of incidence. This remains so until the angle of refraction becomes imaginary. However, no effects of the anistropy factor are found on the reflection coefficients for a normally incident wave. The results, mentioned above, are therefore discussed only for the obliquely incident wave. A geophysically interesting situation has been chosen for studying, quantitatively, the effects of the anisotropy factor on the reflection of SH waves.

scholarly journals Response of sedimentary basin to obliquely incident SH waves

2015 ◽  
Vol 14 (3) ◽  
pp. 647-671 ◽  
Author(s):  
Chuanbin Zhu ◽  
David P. Thambiratnam ◽  
Jian Zhang
Keyword(s):  
Sedimentary Basin ◽  
Sh Waves ◽  
Obliquely Incident

Torsional response of a rigid circular foundation on a saturated half-space to SH waves

2010 ◽  
Vol 30 (10) ◽  
pp. 1082-1088 ◽  
Author(s):  
Yuan-qiang Cai ◽  
Peng Wang ◽  
Hong-Lei Sun ◽  
Chang-jie Xu
Keyword(s):  
Half Space ◽  
Sh Waves ◽  
Torsional Response

Seismic site amplification in multilayer soil under obliquely incident SH waves

2017 ◽  
Vol 95 ◽  
pp. 83-95
Author(s):  
H. Djabali-Mohabeddine ◽  
B. Tiliouine ◽  
M. Hammoutene ◽  
M.K. Berrah
Keyword(s):  
Site Amplification ◽  
Sh Waves ◽  
Obliquely Incident

Response of structures to nonvertically incident seismic waves

1982 ◽  
Vol 72 (1) ◽  
pp. 275-302 ◽  
Author(s):  
J. E. Luco ◽  
H. L. Wong
Keyword(s):  
Rayleigh Waves ◽  
Nuclear Power ◽  
Seismic Waves ◽  
Vertical Component ◽  
Wave Excitation ◽  
Sh Wave ◽  
Sh Waves ◽  
Torsional Response ◽  
Concrete Building ◽  
Incident Waves

abstract A study of the earthquake response of symmetric elastic structures subjected to SH-wave excitation with different angles of incidence and to Rayleigh waves is presented. For SH-wave excitation, particular emphasis is given to the study of the possible reduction of the response due to filtering by the foundation and the torsional response. For Rayleigh wave excitation, the effects of the additional rocking associated with the vertical component of the excitation are investigated. The results obtained for models of a 10-story reinforced concrete building and the containment structure of a nuclear power plant reveal that the response for nonvertically incident waves is significantly different from that obtained on the basis of the usual assumption of vertically incident SH waves.

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