Influence of a new‐bored neighbouring cavity on the seismic response of an existing tunnel under incident P‐ and SV‐waves

2021 ◽  
Author(s):  
Elefterija Zlatanović ◽  
Vlatko Šešov ◽  
Dragan Č. Lukić ◽  
Zoran Bonić
Keyword(s):  
Seismic Response ◽  
P And Sv Waves

The seismic response of sediment-filled valleys. Part 2. The case of incident P and SV waves

1980 ◽  
Vol 70 (5) ◽  
pp. 1921-1941
Author(s):  
Pierre-Yves Bard ◽  
Michel Bouchon
Keyword(s):  
Seismic Response ◽  
Rayleigh Waves ◽  
High Amplitude ◽  
Ground Shaking ◽  
Resonance Modes ◽  
Long Duration ◽  
Time Domains ◽  
P And Sv Waves ◽  
Lateral Resonance ◽  
Main Component

abstract We present the extension to incident P and SV waves of our previous study (Bard and Bouchon, 1980) concerning the seismic response of sediment-filled bidimensional valleys to incident SH transient signals. The reliability of the Aki-Larner method is briefly discussed and the domain is estimated within which it provides accurate results. Then we investigate the response of three different valleys, having various geometrical and elastic parameters, to vertically incident P and SV waves, in both the frequency and time domains. The behavior of the valleys is shown to be qualitatively similar to their behavior for SH waves: the nonplanar interface causes surface waves (here Rayleigh waves) to be generated on valley edges, and to propagate laterally inside the basin. The amplitude of these Rayleigh waves depends greatly on the velocity contrast, the valley shape, and the incident wave type (P or SV), but it may be significantly higher than the disturbance associated with the direct incident signal. The frequency and direction of incident motion determine partly whether the fundamental or first higher mode will be predominantly excited, depending on the main component (vertical or horizontal) of the Rayleigh mode motion. Although the reflections of these Rayleigh waves on valley edges do not appear as clearly as in the SH case, a very long duration of the ground shaking inside the valley is still observed. In deep valleys, these laterally propagating Rayleigh waves may degenerate into a lateral resonance pattern, involving high-amplitude surface motion. These latter resonance modes, however, begin to appear in shallower valleys for incident SV waves than for incident P ones.

scholarly journals Numerical simulation of multiple scattering of P and SV waves caused by near-surface parallel cracks

2016 ◽  
Vol 55 (4) ◽  
Author(s):  
Rafael Ávila-Carrera ◽  
Alejandro Rodríguez-Castellanos ◽  
Celestino Valle-Molina ◽  
Francisco José Sánchez-Sesma ◽  
Francisco Luzón ◽  
...  
Keyword(s):  
Free Surface ◽  
Seismic Response ◽  
Multiple Scattering ◽  
Time Domain ◽  
Near Surface ◽  
Crack System ◽  
Amplitude Spectra ◽  
Shallow Crack ◽  
The Time Domain ◽  
P And Sv Waves

Scattering and diffraction of P and SV waves caused by parallel oriented cracks located near to a free surface are investigated in this work. The Indirect Boundary Element Method (IBEM) was applied for studying the wave propagation phenomena in a half-plane model that contain the cracks. Various incidence angles of P and SV waves are considered. Sometime before it has been reported that a near free-surface crack generates scattered surface waves whose amplitude spectra show conspicuous resonance peaks. Such effect has been attributed to local resonances originated in a virtual layer between the shallowest crack and the free surface. For our case of two parallel crack system, where cracks are located at different depths, the amplitude spectra show additional peaks, which can be associated with the presence of the second crack. Given similar sizes between these two cracks, the characteristic resonance frequency observed at the free surface corresponds mainly to the equivalent layer formed by the shallowest crack and the free surface. However, when the deepest crack becomes sufficiently large with respect to the shallow crack, two resonance characteristic frequency peaks appear in the measured spectra at the free surface. Some examples including a three crack system are also illustrated in our work. The identification and characterization of the seismic response for the scattered field generated by the second and third crack has been an intricate task and, the time domain interpretation of traces becomes quite complicated. The results in this paper have been validated against some other reported from classic papers. In order to show the seismic response and multiple scattering effects due to the presence of systems of cracks, calculations in frequency and time domain are provided.

Seismic response analysis of the reef-seawater system under obliquely incident P and SV waves

2020 ◽  
Vol 200 ◽  
pp. 107021 ◽  
Author(s):  
Xin Bao ◽  
Jingbo Liu ◽  
Shutao Li ◽  
Fei Wang ◽  
Piguang Wang
Keyword(s):  
Seismic Response ◽  
Response Analysis ◽  
Seismic Response Analysis ◽  
Obliquely Incident ◽  
P And Sv Waves

Influence of the distribution of the shear walls on the seismic response of the buildings

2020 ◽  
Vol 15 (1) ◽  
pp. 37-44
Author(s):  
El Mehdi Echebba ◽  
Hasnae Boubel ◽  
Oumnia Elmrabet ◽  
Mohamed Rougui
Keyword(s):  
Structural Analysis ◽  
Seismic Response ◽  
Natural Frequency ◽  
Structural Design ◽  
Structural Response ◽  
Shear Walls ◽  
Structural Elements ◽  
Analysis Software ◽  
Ansys Apdl ◽  
The Impact

Abstract In this paper, an evaluation was tried for the impact of structural design on structural response. Several situations are foreseen as the possibilities of changing the distribution of the structural elements (sails, columns, etc.), the width of the structure and the number of floors indicates the adapted type of bracing for a given structure by referring only to its Geometric dimensions. This was done by studying the effect of the technical design of the building on the natural frequency of the structure with the study of the influence of the distribution of the structural elements on the seismic response of the building, taking into account of the requirements of the Moroccan earthquake regulations 2000/2011 and using the ANSYS APDL and Robot Structural Analysis software.

Influence of Ground Properties on Seismic Response of Tower Cranes Supported by Pile Foundations

2008 ◽  
Vol 1 (1) ◽  
pp. 37-46
Author(s):  
Satoshi TAMATE ◽  
Yasuo TOYOSAWA ◽  
Seiji TAKANASHI ◽  
Kazuya ITOH ◽  
Naoaki SUEMASA ◽  
...  
Keyword(s):  
Seismic Response ◽  
Pile Foundations
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