Comparative Analysis of the Influence of Slope Terrain on Characteristics of Horizontal and Vertical Ground Motion Response Spectrum

2012 ◽  
Vol 446-449 ◽  
pp. 2279-2284
Author(s):  
Li Ping Wang ◽  
Yao Zhao
Keyword(s):  
Ground Motion ◽  
Response Spectrum ◽  
Spectral Ratio ◽  
Earthquake Damage ◽  
Building Structures ◽  
Element Analysis ◽  
Motion Response ◽  
Vertical Ground Motion ◽  
Vertical Ground ◽  
Elastic Responses

All previous earthquake damage show earthquake damage of the buildings on the slope is serious than the buildings on flat ground, so it is important to analyze of the influence of slope terrain on characteristics of horizontal and vertical ground motion response spectrum. The horizontal and vertical seismic elastic responses of 28 viscoelastic rocky slopes by white noises excited, with height of 10m to70m and slope of 15°to 60°, are calculated by numerical finite element analysis method. The influence laws of height and degree of slope on horizontal and vertical ground motion response spectrum and response spectral ratio are analyzed. The distribution laws of the corresponding period of the maximum of response spectral ratios are contrasted. The maximum of amplification factor of design horizontal and vertical ground motion for structures on rock slopes are given to be the references to code for seismic design of building structures.

Vertical Ground Motion Characteristics of Wenchuan Earthquake

2011 ◽  
Vol 94-96 ◽  
pp. 1828-1832
Author(s):  
Jian Ping Han ◽  
Qing Yan ◽  
Wei Zhou
Keyword(s):  
Wenchuan Earthquake ◽  
Ground Motion ◽  
Epicentral Distance ◽  
Response Spectrum ◽  
Acceleration Response ◽  
Vertical Ground Motion ◽  
Vertical Ground ◽  
Acceleration Response Spectrum ◽  
Horizontal Ground Motion ◽  
Motion Characteristics

The Wenchuan earthquake of May 12, 2008(Mw=8.0) was the most significant earthquake that had affected Chinese Mainland since the Tangshan earthquake of 1976. The dense network of seismographs deployed in this region recorded ground motion acceleration data with good quality. In this paper, vertical ground motion characteristics of Wenchuan Earthquake are investigated from the database including 282 records at 94 stations. Special attention is focused on the behavior of the recorded vertical ground motion and its relation to the horizontal ground motion counterparts. The results indicate that the average value of the ratios of vertical to horizontal peak ground acceleration (av/ah) is 0.58, but the ratios of over 30% stations exceed the rule-of-thumb value of 2/3. This av/ah is much discrete in the near-fault region and tends to decrease with the increase of epicentral distance. Furthermore, site condition also influences this ratio. The curve of vertical to horizontal acceleration response spectral ratio (Sav/Sah) with period ranging from 0 to 6s appears to be saddle-shaped overall and Sav/Sah value varies within different period range. It is also can be seen that the vertical acceleration response spectrum (Sav) looks thin compared with the horizontal acceleration response spectrum (Sah). Except several stations, the ratio of vertical to horizontal ground motion predominant period (Tpv/ Tph) is less than 1.0, and it increases with the increase of epicentral distance and becomes smooth gradually.

Characteristics of Free-Field Vertical Ground Motion during the Northridge Earthquake

1995 ◽  
Vol 11 (4) ◽  
pp. 515-525 ◽  
Author(s):  
Youself Bozorgnia ◽  
Mansour Niazi ◽  
Kenneth W. Campbell
Keyword(s):  
Ground Motion ◽  
Near Field ◽  
Free Field ◽  
Seismic Source ◽  
Spectral Ratio ◽  
Response Spectra ◽  
Northridge Earthquake ◽  
Attenuation Relationships ◽  
Vertical Ground Motion ◽  
Vertical Ground

Characteristics of response spectra of free-field vertical ground motion recorded during the 1994 Northridge earthquake are examined. Dependence of vertical and horizontal response spectra, and their ratio, on the site-to-source distance is investigated through development of attenuation relationships for vertical and horizontal spectral ordinates. The database includes 123 response spectra of the motions recorded at 41 alluvial sites. Vertical-to-horizontal (V/H) response spectral ratio is found to be strongly dependent on period and distance of site to the seismic source. V/H spectral ratio largely exceeds the commonly assumed value of 2/3, at short periods in the near-field region. The main characteristics of V/H spectral ratio for the Northridge earthquake are found to be qualitatively similar to those observed in the 1989 Loma Prieta, California, and in several other earthquakes recorded over the SMART-1 array in Taiwan. These characteristics are very likely to be universal.

scholarly journals Multisource Ground Motion Attenuation Relationship Model for the Vertical Component of the Wenchuan Earthquake on May 12, 2008

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Ping Liu ◽  
Tongjie Ren ◽  
Hai Wang ◽  
Chunfeng Li ◽  
Baoqiang Wang ◽  
...  
Keyword(s):  
Wenchuan Earthquake ◽  
Ground Motion ◽  
Response Spectrum ◽  
Site Effect ◽  
Source Model ◽  
Attenuation Relationship ◽  
Ground Motion Attenuation ◽  
Vertical Ground Motion ◽  
The Wenchuan Earthquake ◽  
Vertical Ground

In order to extend the multisource model to vertical ground motion, we fit the vertical ground motion attenuation relationship of the Wenchuan earthquake. Different from traditional attenuation relationship forms, we propose a simplified ground motion attenuation function including site effect via a flag related to VS30. The regression results show that it has site effect on the vertical ground motion of the Wenchuan earthquake and gradually weakens with the increase in periods. According to residuals analysis, the hanging-wall effect on vertical ground motion is strong for the Wenchuan earthquake, especially in short periods. The result analysis indicates that the shape of the vertical response spectrum based on regression is different from that of the horizontal component and complies with the recommended design vertical response spectrum of FEMA P-1050. V/H (vertical-to-horizontal ratios), as a main way to estimate vertical ground motion, cannot be simply fixed as 2/3. Therefore, site location, site condition, and frequency spectrum have to be considered comprehensively. The regression accuracy of the vertical ground motion of the multisource model is slightly higher than that of the point-source model and lower than that of the finite fault source model. It is expected that this model will serve as an alternative for source-to-site distance when multiple asperities are to be modeled in the absence of the detail fault model to get a general scenario of the future ground motions.

Sign in / Sign up

Export Citation Format

Share Document