Bridge Approach Embankments Supported on Concrete Injected Columns

2008 ◽  
Author(s):  
Jeff Hsi
Keyword(s):  
Bridge Approach

Settlement characteristics of bridge approach embankment based on scale model test

2020 ◽  
Vol 27 (7) ◽  
pp. 1956-1964
Author(s):  
Jiu-peng Zhang ◽  
Tao Liu ◽  
Jian-zhong Pei ◽  
Rui Li ◽  
Dao-guang Zou ◽  
...  
Keyword(s):  
Model Test ◽  
Scale Model ◽  
Bridge Approach

Engineered Semi-Flexible Composite Mixture Design and Its Implementation Method at Railroad Bridge Approach

2021 ◽  
pp. 036119812110049
Author(s):  
Shuai Yu ◽  
Shihui Shen ◽  
Hai Huang ◽  
Cheng Zhang
Keyword(s):  
Transition Zone ◽  
Structural Adjustment ◽  
Asphalt Mixture ◽  
Vertical Displacement ◽  
Smooth Transition ◽  
Railway Track ◽  
Dynamic Force ◽  
Entire Structure ◽  
Bridge Approach ◽  
Composite Mixture

Considerable variation in the vertical displacement can cause railway tracks’ transition problems at the bridge approach. The vertical displacement gaps can result in amplification of the dynamic force and frequency, and gradually degrade the serviceability of the railway track. Many strategies, focusing on either modifying the track component or making changes to the entire structure, were used to mitigate transition problems. In particular, asphalt concrete underlayment as a structural adjustment method provides additional support to the ballast and protects the subgrade. However, its effect of reducing dynamic impact at the bridge approach is limited because asphalt mixture has a limited range of modulus and cannot make enough adjustments to the entire structure. Therefore, this paper aims to develop an engineered semi-flexible composite mixture (SFCM) design to mitigate the transition problem. The experiment showed that SFCM is a viscoelastic material with a wider modulus range, and its modulus can adjust with its air voids and the concrete slurry content. Track analysis using a 2.5D sandwich model was conducted to simulate the effects of the structure and material on the responses of the railway track under the dynamic loads and determine the arrangement of the transition zone. A four-segment transition zone design was eventually proposed for a special case of bridge approach. This method can be used to develop transition zones for achieving a smooth transition at the bridge approaches.

A bridge-to-bridge approach to heart transplantation using ECMO and total artificial heart

2021 ◽  
Author(s):  
Pierre-Emmanuel Noly ◽  
Jaime Moriguchi ◽  
Keyur B. Shah ◽  
Anelechi C. Anyanwu ◽  
Claudius Mahr ◽  
...  
Keyword(s):  
Heart Transplantation ◽  
Artificial Heart ◽  
Total Artificial Heart ◽  
Bridge Approach

Dynamic Analysis of Bridge-Approach Embankment Transition Segment

2012 ◽  
Vol 238 ◽  
pp. 719-722
Author(s):  
Zhen Xia Li ◽  
Yuan Zhao Chen
Keyword(s):  
Dynamic Analysis ◽  
Coupled System ◽  
Dynamic Responses ◽  
Subgrade Reaction ◽  
Track Dynamics ◽  
Bridge Approach

Dynamic responses of coupled system were analyzed when the speed of train was 350km/h and the transition was filled with graded broken stones mixed 5% cement. Results indicate that setting form of bridge-approach embankment section has little effect on dynamic responses, thus designers can choose it on account of practical circumstances. Based on the study from vehicle-track dynamics, we suggest that the coefficient of subgrade reaction (K30) should be greater than 190MPa within 0-5m zone behind abutment and be greater than 150MPa in other zones.

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