scholarly journals INPUT MOTION OF AN ACTUAL RIGID EMBEDDED FOUNDATION DUE TO SPATIALLY VARIABLE SEISMIC GROUND MOTIONS

2000 ◽  
Vol 65 (529) ◽  
pp. 105-112 ◽  
Author(s):  
Hirotoshi UEBAYASHI ◽  
Yoshihiro TAKEUCHI
Keyword(s):  
Ground Motions ◽  
Embedded Foundation ◽  
Input Motion

scholarly journals Effects of Spatially Varying Seismic Ground Motions and Incident Angles on Behavior of Long Tunnels

2018 ◽  
Vol 2018 ◽  
pp. 1-6 ◽  
Author(s):  
Yundong Zhou ◽  
Yongxin Wu ◽  
Ziheng Shangguan ◽  
Zhanbin Wang
Keyword(s):  
Stress State ◽  
Strain Rate ◽  
Ground Motions ◽  
Pure Shear ◽  
Radial Strain ◽  
Complex Stress State ◽  
Asymmetric Effect ◽  
Principal Stresses ◽  
Input Motion ◽  
Spatially Varying

Seismic behavior of long circle tunnels is significantly influenced by the nature of input motion. This study, based on the 3D finite-element method (FEM), evaluates the effects of spatially varying seismic ground motions and uniform input seismic ground motions and their incident angles on the diameter strain rate and tensive/compressive principal stresses under different strata. It is found that (1) the spatially varying seismic ground motions induced larger diameter strain rate (radially deformation) than the uniform input seismic motion, (2) the spatially varying seismic ground motions had an asymmetric effect on the radial strain rate distributions, and (3) the rising incident angles changed the pure shear stress state into a complex stress state for tunnels under specified input motion.

Influence of an adjacent structure on the horizontal and torsional input motion of an embedded foundation

2016 ◽  
Vol 20 (3) ◽  
pp. 411-425 ◽  
Author(s):  
Xuezhang Wen ◽  
Fangyuan Zhou ◽  
Hongping Zhu
Keyword(s):  
Dynamic Response ◽  
Natural Frequency ◽  
System Parameters ◽  
Structure Response ◽  
Embedded Foundation ◽  
Adjacent Structure ◽  
Input Motion ◽  
Existing Structure ◽  
Important System

Influence of an adjacent structure on both the horizontal and torsional input motion of an embedded foundation is discussed in this article. Four important system parameters, namely, the distance between the adjacent structure and embedded foundation, the natural frequency of the adjacent structure, the shape of the adjacent structure, and the arrangement angle of the adjacent structure are considered to investigate both the horizontal and torsional input motion of an embedded foundation influenced by an adjacent structure. It is found that the values of the horizontal input motion of the embedded foundation can be significantly influenced around the natural frequency of the adjacent structure. The torsional input motion of the embedded foundation can be generated due to the presence of the adjacent structure. Response of an existing structure influenced by the adjacent structure is then investigated. The results show that the response of the existing structure can be affected by the adjacent structure. When the horizontal natural frequency of the adjacent structure coincides with the torsional natural frequency of the existing structure, the torsional dynamic response of the existing structure can be affected significantly.

scholarly journals Effect of Characteristics of Ground Motion on Seismically Induced Sliding Surface of Slopes

2021 ◽  
Vol 11 (12) ◽  
pp. 5319
Author(s):  
Muhammad Irslan Khalid ◽  
Yonggook Lee ◽  
Yong-Hee Lee ◽  
Hak-Sung Kim ◽  
Duhee Park
Keyword(s):  
Ground Motion ◽  
Ground Motions ◽  
Nonlinear Finite Element ◽  
Sliding Surface ◽  
Strength Parameters ◽  
The Mean ◽  
Motion Characteristics ◽  
Definition Of ◽  
Input Motion ◽  
Steep Slopes

The seismic performance of slopes is typically evaluated with a pseudo-static method using equivalent horizontal load or with Newmark sliding block analysis. In both procedures, the definition of the potential sliding surface is a required input. The sliding surface has been reported to be marginally influenced by the input ground motion and, therefore, is most often assumed from a pseudo-static procedure. In this study, extensive series of two-dimensional dynamic nonlinear finite element analyses are performed to evaluate the sensitivity of the sliding surface on the slope geometry, soil strength parameters, and input ground motion characteristics. It is demonstrated that the sliding surface may vary with the intensity and frequency characteristics of the input motion. Slopes with inclination angle equal or less than 35° are shown to be marginally influenced by motion intensity if the mean period (Tm) < 0.3 s. However, slopes inclined at 45° are revealed to be more sensitive to the motion intensity and Tm. For motions with Tm > 0.3 s, the sliding surface is demonstrated to widen with an increase in the intensity of the input ground motions. The degree of widening increases proportionally with an increase in Tm. It is, therefore, recommended to derive sliding surfaces from a dynamic analysis for steep slopes.

SIMPLE METHOD FOR STRESS OF PILE DURING EARTHQUAKES OF EMBEDDED FOUNDATION ON PILE GROUP BASED ON SWAY-ROCKING MODEL

1999 ◽  
Vol 64 (523) ◽  
pp. 55-62 ◽  
Author(s):  
Takeshi FUJIMORI ◽  
Kaeko YAHATA ◽  
Toshiaki HATORI ◽  
Taro NAKAGAWA ◽  
Masaru TANAKA
Keyword(s):  
Pile Group ◽  
Simple Method ◽  
Embedded Foundation
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