Vertical Isolation Research of Rubber Bearing in Series with Disk Spring

2012 ◽  
Vol 166-169 ◽  
pp. 367-370
Author(s):  
Qiang Rong ◽  
Yan Sheng
Keyword(s):  
Ground Motion ◽  
Mechanical Model ◽  
Base Isolation ◽  
Isolation Layer ◽  
Vertical Ground Motion ◽  
Rubber Bearing ◽  
Disk Spring ◽  
In Series ◽  
Vertical Ground ◽  
Horizontal Ground Motion

The isolation of horizontal ground motion is usually considered in the base isolation. However, the influence of vertical ground motion is not enough considered. The rubber isolation bearings install in series disk spring. The isolation layer parameters and the corresponding mechanical model are proposed. The vertical isolation effect of the new system is remarkable by analyzing example.

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.

scholarly journals Numerical assessment of vertical ground motion effects on highway bridges

2020 ◽  
Vol 47 (7) ◽  
pp. 790-800 ◽  
Author(s):  
Hadi Aryan ◽  
Mehdi Ghassemieh
Keyword(s):  
Ground Motion ◽  
Numerical Study ◽  
Three Dimensional ◽  
Vertical Component ◽  
Time History ◽  
Highway Bridges ◽  
Vertical Excitation ◽  
Vertical Ground Motion ◽  
Field Evidence ◽  
Vertical Ground

Field evidence of recent earthquakes shows serious bridge damages due to the direct compression or tension in the columns and some flexural and shear failures caused by the variation in axial force of the columns. These damages could not be produced solely by the horizontal seismic excitations; the vertical component of the earthquake is involved. This paper presents a numerical study highlighting the presence of vertical seismic excitation. Nonlinear time history analyses are conducted on detailed three-dimensional models of multi-span simply supported and multi-span continuous bridges using a suite of representative ground motions. The results showed the significant influence of vertical excitation on the bridge responses. Therefore, it is imperative to include more efficient criteria to upgrade the design codes and extend practical techniques that consider and cope with the structural effects of vertical ground motion along with the horizontal excitations.

Sign in / Sign up

Export Citation Format

Share Document