scholarly journals Seismic Study of Skew Bridge Supported on Laminated-Rubber Bearings

2020 ◽  
Vol 2020 ◽  
pp. 1-17
Author(s):  
Xueshan Liu ◽  
Wei Guo ◽  
Jianzhong Li ◽  
Hua Zhang
Keyword(s):  
Friction Coefficient ◽  
Seismic Response ◽  
Wenchuan Earthquake ◽  
Western China ◽  
Skew Angle ◽  
2008 Wenchuan Earthquake ◽  
Residual Displacements ◽  
Skew Bridge ◽  
Skew Bridges ◽  
Rubber Bearings

Skew bridges consisting of simply supported girders, continuous decks, and laminated-rubber bearings are widely used in western China; however, they are highly vulnerable to strong earthquakes. To investigate the seismic performance of skew bridges considering the sliding behavior of laminated-rubber bearings, the Duxiufeng Bridge located in Sichuan, China, was used as a prototype bridge. This bridge is a skew bridge that suffered seismic damage during the 2008 Wenchuan earthquake. The possible seismic response of this skew bridge under the Wenchuan earthquake was simulated, and the postearthquake repair methods were analyzed considering the effects of bearing types and cable restrainers. Parametric studies, using the finite element method, were also performed to investigate the effects of the skew angle and friction coefficient of the bearings on the seismic response of the skew bridge. The results indicate that pin-free bearings could effectively control the seismic displacement of the bridge, and the cable restrainers with an appropriate stiffness could significantly reduce the longitudinal residual displacements. The effect of skew angles is less significant on skew bridges with laminated-rubber bearings than on rigid-frame skew bridges because of the sliding between the girders and bearings. The residual displacements of the bearings were more sensitive to the variation in the friction coefficient between the laminated-rubber bearings and the girders compared to the maximum seismic displacements.

Critical Seismic Response Analysis of Skew Bridges

2014 ◽  
Vol 488-489 ◽  
pp. 394-397
Author(s):  
Ming Qi Lu ◽  
Shao Qin Guo
Keyword(s):  
Seismic Response ◽  
Ground Motion ◽  
Seismic Vulnerability ◽  
Time History ◽  
Response Analysis ◽  
Skew Angle ◽  
Combination Rules ◽  
Skew Bridge ◽  
Seismic Force ◽  
Skew Bridges

The complexity of seismic response for skew bridge rises higher seismic-vulnerability relatively in comparison with right bridge. One of the parameters that directly affects the seismic response on a skew bridge is the excitation angle of the ground motion [. This paper investigates the effects of seismic force direction on the responses of skew bridges without considering impact effect in time history nonlinear dynamic analyses. The combination rules for orthogonal earthquake effects, such as the 100/ 30, 100/40 percentage rules and the SRSS method are also examined. It is concluded that the angle of excitation that produces the critical responses depends both on the ground motion and bridge characteristics, and the three combination rules are all relatively conservative, a new formula which considers the influence of skew angle and excitation angle of the ground motion is suggested.

Simplified Seismic Response Assessment Method and Parametric Study of Multi-Girder Skew Bridges

2010 ◽  
Vol 456 ◽  
pp. 77-88
Author(s):  
Xin Yi Huang ◽  
Yan Jiang Chen ◽  
Wei Dong Zhuo
Keyword(s):  
Seismic Response ◽  
Parametric Study ◽  
Frequency Ratio ◽  
Response Spectrum ◽  
Mode Shapes ◽  
Eccentricity Ratio ◽  
Skew Bridge ◽  
Bridge Model ◽  
Skew Bridges ◽  
Frequency Ratios

A simplified grillage bridge model suitable for parametric study of skew bridge is presented, and the formulae for computing the seismic response of skew bridges are developed. Considering the existence of crossbeams and elastic bearings, the effects of stiffness eccentricity ratios, frequency ratios, the number of beams and skew angles are assessed using response spectrum analysis. The results show that the natural frequencies and mode shapes depend mainly on the stiffness eccentricity ratio and frequency ratios. The study also demonstrates that the seismic response of skew bridge is influenced quite noticeably by stiffness eccentricity ratio and frequency ratio. The maximum seismic response of skew bridge can be reduced by increasing stiffness eccentricity ratio and frequency ratio. Based on this study, a theory to evaluate the dynamic behavior and seismic response of skew bridges is presented and it can be conveniently applied in bridge seismic design.

scholarly journals A longitudinal study on emotional distress among local government staff seven years after the 2008 Wenchuan earthquake in China

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Yunge Fan ◽  
Lili Guan ◽  
Hu Xiang ◽  
Xianmei Yang ◽  
Guoping Huang ◽  
...  
Keyword(s):  
Longitudinal Study ◽  
Local Government ◽  
Wenchuan Earthquake ◽  
Emotional Distress ◽  
Early Stage ◽  
2008 Wenchuan Earthquake ◽  
The 2008 Wenchuan Earthquake ◽  
One Year ◽  
Self Reporting Questionnaire ◽  
Over Time

Abstract Background The current study examined the change in local government staff’s emotional distress over 7 years after the 2008 Wenchuan earthquake, and the influence of earthquake exposure and professional quality of life (ProQOL) on emotional distress. Methods This longitudinal study assessed 250 participants at 1 year after the earthquake; 162 (64.8%) were followed up at 7 years. Emotional distress was assessed with the Self-Reporting Questionnaire (SRQ) at both time points. We assessed ProQOL, including compassion satisfaction, burnout, and secondary traumatic stress, and earthquake exposure at 1 year. Wilcoxon signed-rank tests were performed to test longitudinal changes in emotional distress. Hierarchical multiple regression was conducted to examine the effect of earthquake exposure and ProQOL. Results The positive screening rate of emotional distress (SRQ ≥ 8) was 37.6 and 15.4% at one and 7 years, respectively. Emotional distress scores declined over time (p < 0.001). Earthquake exposure and ProQOL predicted one-year (ps < 0.05) but not seven-year emotional distress, whereas burnout predicted both one-year (p = 0.018) and seven-year (p = 0.047) emotional distress. Conclusions Although emotional distress can recover over time, it persists even 7 years later. Actions to reduce burnout during the early stage of post-disaster rescue have long-term benefits to staff’s psychological outcomes.

Features and genesis of micro-nanometer-sized grains on shear slip surface of the 2008 Wenchuan earthquake

2014 ◽  
Vol 57 (8) ◽  
pp. 1961-1971 ◽  
Author(s):  
RenMao Yuan ◽  
BingLiang Zhang ◽  
XiWei Xu ◽  
ChuanYong Lin ◽  
LanBing Si ◽  
...  
Keyword(s):  
Wenchuan Earthquake ◽  
Slip Surface ◽  
2008 Wenchuan Earthquake ◽  
The 2008 Wenchuan Earthquake ◽  
Shear Slip

DISLOCATION OF FACE-SLABS OF ZIPINGPU CONCRETE FACE ROCKFILL DAM DURING WENCHUAN EARTHQUAKE

2012 ◽  
Vol 06 (02) ◽  
pp. 1250007 ◽  
Author(s):  
DEGAO ZOU ◽  
YANG ZHOU ◽  
HOE I. LING ◽  
XIANJING KONG ◽  
BIN XU
Keyword(s):  
Wenchuan Earthquake ◽  
Limit Equilibrium ◽  
Failure Surface ◽  
Ground Acceleration ◽  
Factors Affecting ◽  
2008 Wenchuan Earthquake ◽  
Rockfill Dam ◽  
Concrete Face ◽  
Concrete Face Rockfill Dam ◽  
Water Elevation

Zipingpu concrete face rockfill dam (CFRD) is one of the tallest dams that have ever been subjected to strong earthquake shaking and recorded damages. In this paper, finite element method and limit equilibrium method are used to determine the most critical failure surface for Zipingpu CFRD during the 2008 Wenchuan earthquake in China. The dislocation damage of the face-slab joint was then obtained from the sliding block analysis. The major factors affecting dislocation displacement of face-slabs were analyzed. The results showed that the rigid sliding block method is relevant for analyzing the damage of face-slabs of CFRD during earthquake. The peak ground acceleration had a significant influence on the dislocation. As the acceleration of the dam increases with the height while the strength of face-slab joints reduces, the dislocation could easily occur when the upstream slope of the dam started to slide. The water elevation had considerable impact on the dislocation of face-slabs during strong shaking. There might be no dislocation of face-slabs at full reservoir, and the water elevation just above construction joints would induce larger damage.

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