scholarly journals Wave Passage Effect on the Seismic Response of a Building considering Bedrock Shear Wave Velocity

2014 ◽  
Vol 18 (2) ◽  
pp. 89-94
Author(s):  
Yong-Seok Kim
Keyword(s):  
Seismic Response ◽  
Shear Wave ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
Passage Effect ◽  
Wave Passage ◽  
Wave Passage Effect

Shear-Wave Velocity and Seismic Response of Near-Surface Sediments in Charleston, South Carolina

2006 ◽  
Vol 96 (5) ◽  
pp. 1897-1914 ◽  
Author(s):  
R. D. Andrus ◽  
C. D. Fairbanks ◽  
J. Zhang ◽  
W. M. Camp ◽  
T. J. Casey ◽  
...  
Keyword(s):  
South Carolina ◽  
Seismic Response ◽  
Shear Wave ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
Surface Sediments ◽  
Near Surface

scholarly journals The Role of Shear Wave Velocity and Non-Linearity of Soil in the Seismic Response of a Coupled Tunnel-Soil-Above Ground Building System

Geosciences ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 473 ◽  
Author(s):  
Glenda Abate ◽  
Salvatore Grasso ◽  
Maria Rossella Massimino
Keyword(s):  
Seismic Response ◽  
Shear Wave ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
Dynamic Properties ◽  
Kinematic Hardening ◽  
System Response ◽  
Flow Rule ◽  
Elastic Model

The presence of tunnels close to aboveground structures may modify the response of these structures, while the contrary is also true, the presence of aboveground structures may modify the dynamic response of tunnels. In this context, the dynamic properties of the soil through which the aboveground and underground structures are “connected” could play an important role. The paper reports dynamic FEM (Finite Element Method) analyses of a coupled tunnel-soil-above ground structure system (TSS system), which differ in regards to the soil shear wave velocity and in turns for the damping ratio, in order to investigate the role of these parameters in the full-coupled TSS system response. The analyses were performed using three different seismic inputs. Moreover, the soil non-linearity was taken into account adopting two different constitutive models: i) an equivalent linear visco-elastic model, characterized by degraded soil shear moduli and damping ratios, according to suggestions given by EC8 in 2003; and ii) a visco-elasto-plastic constitutive model, characterized by isotropic and kinematic hardening and a non-associated flow rule. The seismic response of the system was investigated in the time and frequency domains, in terms of: acceleration ratios; amplification ratios and response spectra; and bending moments in the tunnel.

scholarly journals Nonlinear Seismic Response Characteristics of CAP1400 Nuclear Island Structure on Soft Rock Sites

2020 ◽  
Vol 2020 ◽  
pp. 1-17
Author(s):  
Furong Li ◽  
Guoxing Chen
Keyword(s):  
Seismic Response ◽  
Shear Wave ◽  
Ground Motion ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
Nuclear Power ◽  
Response Spectrum ◽  
Soft Rock ◽  
Relative Displacement ◽  
Island Structure

CAP1400 nuclear island structure is an advanced and novel nuclear power plant structure. In order to explore the seismic response characteristics of CAP1400 nuclear island structure on soft rock sites, a three-dimensional refined nonlinear seismic response analysis model was established for a soft rock foundation-nuclear island structure system using ABAQUS software. The influences of the input ground motion intensity and the frequency spectrum characteristics on the acceleration, relative displacement, and floor response spectrum, as well as the critical shear wave velocity of nonbedrock sites for CAP1400 nuclear island structure, were proposed. The results suggested that the increasing amplitude of the peak acceleration and relative displacement of nuclear island structure decreased as the soft rock site entered a nonlinear state, and the high-frequency components of the input ground motion became more abundant. Specifically, the earthquake response was the largest at the cooling water tank on the top of the shield building, which was the focus of the seismic research on nuclear island structure. Due to the influence of the ground motion frequency spectrum characteristics and the nonbedrock site effect, the peak acceleration, peak relative displacement, and acceleration response spectrum of the nuclear island structure showed different changing trends for the near-field and far-field ground motions. Based on the influence of the site shear wave velocity on the seismic response of nuclear island structure, it was recommended that the critical shear wave velocity of nonbedrock sites for CAP1400 nuclear island structure should be 1250 m/s, and the nuclear island structure-foundation dynamic interaction could be ignored at this time. The research conclusions could provide some technical support and theoretical basis for the construction and seismic performance research of CAP1400 and other nuclear power plants.

Effects of Spatial Variable Ground Motions on the Seismic Response of Base-Isolated Building

2010 ◽  
Vol 163-167 ◽  
pp. 4422-4428
Author(s):  
Yong Qin Lei ◽  
Yong Feng Du
Keyword(s):  
Seismic Response ◽  
Ground Motion ◽  
Ground Motions ◽  
Time History ◽  
Spatial Variable ◽  
Passage Effect ◽  
History Analysis ◽  
Large Plane ◽  
Wave Passage ◽  
Wave Passage Effect

Aimed to base-isolated building with large plane dimension, the change laws of seismic response for base-isolated building under spatial variable ground motions were researched. Firstly, the artificial spatial variable earthquake time histories were generated using spectral representation method based on code response spectrum. Then the 3-D FEM modal of one based-isolated building with large plane dimension was established and the seismic response of based-isolated building under spatially ground motion was studied by nonlinear time history analysis. The mitigation effects of based-isolated building with large plane dimension were compared each other at the cases of uniform excitation, non-uniform excitation considering only wave passage effect, non-uniform excitation considering both the wave passage effect and incoherence effect, multi-component uniform excitation, multi-component non-uniform excitation considering the wave passage effect and multi-component non-uniform excitation considering both the wave passage effect and incoherence effect. The results show that the seismic response of base-isolated structure with large plane dimension under the uniform excitation is relative safety. When the base-isolated building with large plane dimension is designed by time history analysis, the spatial variability of earthquake ground motion effects can be considered.

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

2008 ◽  
Author(s):  
YuQin Ding ◽  
Alessandro Pagliaroli ◽  
Giuseppe Lanzo ◽  
Adolfo Santini ◽  
Nicola Moraci
Keyword(s):  
Seismic Response ◽  
Shear Wave ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
Velocity Inversion ◽  
One Dimensional ◽  
Soil Deposits

Wave-passage effect on the seismic response of suspension bridges considering local soil conditions

2017 ◽  
Vol 17 (2) ◽  
pp. 501-513 ◽  
Author(s):  
Süleyman Adanur ◽  
Ahmet Can Altunışık ◽  
Hasan Basri Başağa ◽  
Kurtuluş Soyluk ◽  
A. Aydın Dumanoğlu
Keyword(s):  
Seismic Response ◽  
Soil Conditions ◽  
Suspension Bridges ◽  
Passage Effect ◽  
Local Soil ◽  
Local Soil Conditions ◽  
Wave Passage ◽  
Wave Passage Effect

Observations on 1D local seismic response analyses: a case study in the Molise region, Italy

2020 ◽  
Author(s):  
Tony Fierro ◽  
Massimina Castiglia ◽  
Filippo Santucci de Magistris
Keyword(s):  
Seismic Hazard ◽  
Seismic Response ◽  
Shear Wave ◽  
Wave Velocity ◽  
Return Period ◽  
Shear Wave Velocity ◽  
Velocity Profiles ◽  
Target Spectrum ◽  
Local Seismic Response ◽  
Good Agreement

<p>In this work, a review of the seismic microzonation for the city of Campobasso, conducted after the 2002 Molise earthquake (Italy), is made. Fourteen sites to perform 1D analysis were selected. The stratigraphy and the physical and mechanical properties of the soils were available from both direct tests and literature survey. Down-hole profiles were accessible for the area and additional MASW tests were conducted in 2016.</p><p>A seismic hazard analysis was performed by accounting for the characteristics of the active faults located in a range of about 50 km, the disaggregation of PGA with a probability of exceedance of 10% in 50 years and the Gutenberg-Richter recurrence law for a return period of 475 years based on the Parametric Catalogue of Italian Earthquakes. The magnitude and distance ranges that are most probable to contribute to the seismic hazard of the municipality are 5.5-7.5 and 0-50 km, respectively. These ranges were used for the selection of a set of design earthquake motions to be representative of the seismicity of the site, which, consequently, matches the requirements of the Italian code in terms of target spectrum. Eight earthquake motions were selected from the ESM and PEER databases; the target spectrum refers to a Safe Life Limit State (SLV) with return period of 475 years, topographic category T1 and soil type A. The compatibility is verified by fitting the mean spectrum obtained from the accelerograms within a tolerance of 10 % in the lower bound and 30% in the upper bound for a specific range of periods of the design spectrum. The software InSpector was used to check the match.</p><p>1D local seismic response analyses were performed in the frequency domain by using the software STRATA.</p><p>There was a good agreement between the shear wave velocity profiles obtained from down-hole and MASW tests, except for few cases in which problems during the test execution or high environmental noise could have affected the down-hole results by providing meaningless profiles. Even though the shear wave velocity profiles have a good agreement, the transfer functions computed with both profiles show different resonance frequencies as expected. From the 1D seismic response analyses, the importance of the superficial layers in the amplification of the earthquake motion was highlighted, thus showing a substantial difference in the acceleration profile at the surface and a few meters below the top ground. The spectra at the surface were compared with the relative target spectra for the same site class of the considered soil deposit and the accelerations were found to be higher than those provided by the code spectra for the small periods range and the design spectra become instead much conservative for periods higher than 0.4 s. The latter two considerations underline the importance of conducting site response analyses in engineering applications to optimize the design seismic forces on the structures.</p>

Characteristics of spatial variability of shear wave velocity on seismic response of slopes

2020 ◽  
Vol 13 (16) ◽  
Author(s):  
Bahram Nadi ◽  
Omid Tavasoli ◽  
Puorya Kazemi Esfeh ◽  
Denise-Penelope N. Kontoni
Keyword(s):  
Spatial Variability ◽  
Seismic Response ◽  
Shear Wave ◽  
Wave Velocity ◽  
Shear Wave Velocity
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