SEISMIC RESPONSE OF A HIGH-PIER BRIDGE SUBJECTED TO OBLIQUE INCIDENCE WAVES

2017 ◽  
Author(s):  
Yin Gu ◽  
Hongxiang Guo ◽  
Weidong Zhou
Keyword(s):  
Seismic Response ◽  
Oblique Incidence ◽  
High Pier

scholarly journals Effects of Oblique Incidence of SV Waves on Nonlinear Seismic Response of a Lined Arched Tunnel

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Dunyu Lyu ◽  
Sha Ma ◽  
Chu Yu ◽  
Congcong Liu ◽  
Xiaowei Wang ◽  
...  
Keyword(s):  
Wave Propagation ◽  
Wave Field ◽  
Seismic Response ◽  
Seismic Wave ◽  
Oblique Incidence ◽  
Incident Angle ◽  
Three Dimensional ◽  
Seismic Wave Propagation ◽  
Finite Element Program ◽  
Artificial Boundaries

The incident direction of earthquake motion is an important factor affecting the seismic response of underground structures. In this study, a three-dimensional (3D) oblique incidence method of SV waves is proposed and the effects of incident angles of SV waves on the seismic response of a lined arched tunnel are evaluated. Based on wave field decomposition principle and equivalent node force method and together with viscous-spring artificial boundary, the oblique incidence method of SV waves is implemented by transforming seismic wave field into the equivalent nodal forces acting on the artificial boundaries. By deriving the distance of the incident waves and the reflected wave on free surface to artificial boundaries, this method can comprehensively consider the phase difference of the seismic wave propagation and the influence of the damping effect of the rock medium on the seismic wave propagation. The method is programed into a dynamic finite element program and its effectiveness is examined by a numerical example. Consequently, the oblique incidence method is applied to evaluate the seismic behaviors of the tunnel. The numerical results reveal that (1) the oblique incidence of the seismic wave results in a larger seismic response; (2) the response amplitudes of the stress and displacement increase with the increase of incident angles and reaching the maximum in the case of 30° incident angle; (3) the damage extent increases with an increase in the incident angles, and the oblique incidence of the seismic wave is believed to increase the spatial difference of damage distribution.

scholarly journals Shaking Table Test of High Pier and Small Radius Curved Bridge under Multi-point Excitation

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Lei Yan ◽  
Guo Li ◽  
Kang An ◽  
Kefeng Yue ◽  
Zhi Lin
Keyword(s):  
Seismic Response ◽  
Seismic Waves ◽  
Shaking Table Test ◽  
Damping Ratio ◽  
Shaking Table ◽  
Small Radius ◽  
Curved Bridge ◽  
Bridge Model ◽  
High Pier ◽  
The Impact

The non-uniform stratum and uneven surface have the complicated seismic spatial variability. The seismic response of high pier and small radius curved bridge caused by the seismic specificity of this kind of terrain has not been systematically studied. According to the multi-point excitation theory of long-span structures and the similar theory of shaking table test in model structures, a high pier with small radius curved girder bridge was used as the research object. The shaking table test of real bridge model was carried out to study the seismic response laws of this kind of bridge under multi-point excitation. The results show that the designed seismic wave expansion device can meet the test requirements. The frequency of the model structure decreases rapidly and the damping ratio increases during the whole test process. The local terrain effect amplifies the seismic response of high pier and small radius curved bridge. The seismic response of high pier and small radius curved bridge is affected by different frequency spectrum seismic waves, and there is a big difference. Based on the above results, the impact of multi-point excitation should be considered in seismic design of high pier with small radius curved bridge.

Seismic Response Analysis of Partial Curve Long-Span Rigid Frame Bridge with Super High Pier

2011 ◽  
Vol 308-310 ◽  
pp. 1314-1321
Author(s):  
Yang Liu ◽  
Da Wang ◽  
Min Hai Chen
Keyword(s):  
Seismic Response ◽  
Seismic Performance ◽  
Great Influence ◽  
Time History ◽  
Dynamical Stability ◽  
Response Analysis ◽  
Long Span ◽  
Rigid Frame ◽  
High Pier ◽  
Rigid Frame Bridge

Based on the time history analysis method, some curve long-span rigid frame bridge with super high pier in Sichuan was taken as the studying case, and a studying of natural vibration characteristics and seismic response. Comparative study was emphasis carried on seismic performance between the partial curve bridge and the straight. In addition, the exhaustive research to about between crosswise relation to the structure overall rigidity contribution and to the structure and the seismic performance influence is conducted. The conclusion of the study shows that the seismic performance of the straight long-span rigid frame bridge with super high pier is surpassing the curve bridge. The curve linear has little influence to the base frequency of this kind of structure, and The rigidity is mainly effected by the bridge pier. If additionally builds the crosswise relation between the structure, the dynamic characteristic of the structure will be improved greatly. The height of this type bridge has great influence on the dynamical stability, the height is lower and the dynamical stability is better, which is more advantageous to the structure seismic behavior.

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