Long Term Deformation Control of Long-Span Pre-Stressed Concrete Continuous Rigid Frame Bridge with Ballastless Track

2010 ◽  
Vol 163-167 ◽  
pp. 1515-1519 ◽  
Author(s):  
Jian An Cao ◽  
Mei Xin Ye ◽  
Wen Qi Hou
Keyword(s):  
Rail Transit ◽  
Bridge Construction ◽  
Deformation Control ◽  
Long Span ◽  
Ballastless Track ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
External Tendons ◽  
Rigid Frame Bridge

Aiming to Ronggui Bridge (RGB) on Guangzhou-Zhuhai Intercity Rapid Rail Transit (GZIRRT), long term deformation control of long-span pre-stressed concrete continuous rigid frame bridge with ballastless track was studied. Comparing with the non-controlled deformation, extend track laying six months later after bridge construction, reserve 48 post-tensioned cables in middle spans and tension 12 external tendons after tracking laying were all effective in decreasing the long term deformation of RGB with individual application. Taking bridge construction and railway service in consideration, applying the foregoing three measures in combination, deformation of RGB 20 years later after track laying was effectively controlled within 12.8mm in the side spans and 21.9mm in the middle spans, which is less than the deformation limitation of bridges with ballastless track. The combined measure has been adopted in the actual construction of RGB.

Long Span Prestressed Concrete Continuous Rigid-Frame Bridge ANN Construction Control

2012 ◽  
Vol 204-208 ◽  
pp. 2261-2264
Author(s):  
Geng Feng Ren ◽  
Cun Jun Zou ◽  
Yue Xu
Keyword(s):  
Neural Network ◽  
Artificial Neural Network ◽  
Prestressed Concrete ◽  
Construction Control ◽  
Bridge Construction ◽  
Long Span ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Artificial Neural ◽  
Rigid Frame Bridge

Based on the theory of ANN (Artificial Neural Network),The paper raised the method of construction control, and introduced the common forecasting method. According to the characteristic of ANN itself and the complexity of factors which influence the elevation, the paper analysed the influence aspects of ANN. On the promise of bridge construction precision, the paper raised section measure、elasticity model、temperature、delay of construction and cantilever for neural network’s input vector in bridge construction process. With the help of Graphical User Interface, built ANN, made the forecast function in the bridge construction into reality. Introduce the theory of Artificial Neural Network(ANN) into long span prestressed concrete continuous rigid-frame bridge construction control.

Simulation Analysis on Construction of Liangjiang Great Bridge

2014 ◽  
Vol 587-589 ◽  
pp. 1698-1702
Author(s):  
Min Si ◽  
Shi Xiang Bie ◽  
Bao Lai Li ◽  
Xiao Chun Fan
Keyword(s):  
Prestressed Concrete ◽  
Simulation Analysis ◽  
Bridge Construction ◽  
Long Span ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Initial Camber ◽  
High Pier ◽  
Cantilever Construction ◽  
Rigid Frame Bridge

Liangjiang Great Bridge is the prestressed concrete continuous rigid frame bridge with high pier and long-span. It adopts the segmented cantilever construction method. The process of its construction is the key to the construction control simulation analysis. In this paper, based on the characteristics of the bridge construction, finite element method is used to establish the simulation model. Cantilever construction stages and closure stages of bridge are simulated and analyzed. The structure deflection diagrams in the each section construction and the later construction considering the creep and shrinkage of concrete are obtained. The initial camber of each segment is given in the construction. The stress characteristics of key section are analyzed in the construction process. It provides a basis for monitoring and on-site construction of bridge and the reference for similar bridge construction.

Parameter Sensitivity Analysis of Vertical Deflection for Long-Span Continuous Rigid-Frame Bridge

2010 ◽  
Vol 163-167 ◽  
pp. 1500-1504 ◽  
Author(s):  
Heng Bin Zheng ◽  
Xiao Lin Yu ◽  
Jun Liang Hu ◽  
Quan Sheng Yan
Keyword(s):  
Sensitivity Analysis ◽  
Element Model ◽  
Simulation Method ◽  
Parameter Sensitivity ◽  
Parameter Sensitivity Analysis ◽  
Long Span ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Rigid Frame Bridge

The excessive long-term deflections of a long span continuous girder bridge may induce vehicles to move unsafely and hazard to the bridge operation, thus to limit the development of this bridge type. In this paper the main parameters influencing the long-term deflections of a continuous rigid-frame bridge, such as pre-stressed losses, mass distribution of the box girder and Young’s modules of concrete etc., were investigated. With the establishment of the finite element model of a real bridge and the premise of describing mechanism of each parameter, detailed parameter sensitivity analysis of long-term deflections were carried out with numerical simulation method. The results of this study may help to understand the main mechanism about the long-term deflection of continuous rigid-frame bridge and provide some reference for the wide use of this type of bridges.

Analysis of Technical Characteristics and Construction Focus of Long-Span Continuous Rigid Frame Bridge with High-Rise Piers

2014 ◽  
Vol 587-589 ◽  
pp. 1637-1641
Author(s):  
Yao Cui ◽  
We Nang Hou ◽  
Fei Ying Liu
Keyword(s):  
Deep Water ◽  
Water Reservoir ◽  
Bridge Pier ◽  
Reservoir Area ◽  
High Rise ◽  
Construction Methods ◽  
Long Span ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Rigid Frame Bridge

Under the condition of the deep water reservoir area, the choice of bridge pier and long span continuous rigid frame beam construction methods are quite various. And the analysis of destruction of bridge depends mostly on the beam and piers. The paper cares mostly about these two parts.

scholarly journals Analysis of Non-Uniform Shrinkage Effect in Box Girder Sections for Long-Span Continuous Rigid Frame Bridge

2018 ◽  
Vol 13 (2) ◽  
pp. 146-155 ◽  
Author(s):  
Zhuoya Yuan ◽  
Pui-Lam Ng ◽  
Darius Bačinskas ◽  
Jinsheng Du
Keyword(s):  
Finite Element ◽  
General Purpose ◽  
Element Analysis ◽  
Box Girder ◽  
Finite Element Program ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Shrinkage Effect ◽  
Rigid Frame Bridge

To consider the effect of non-uniform shrinkage of box girder sections on the long-term deformations of continuous rigid frame bridges, and to improve the prediction accuracy of analysis in the design phase, this paper proposes a new simulation technique for use with general-purpose finite element program. The non-uniform shrinkage effect of the box girder is transformed to an equivalent temperature gradient and then applied as external load onto the beam elements in the finite element analysis. Comparative analysis of the difference in deflections between uniform shrinkage and nonuniform shrinkage of the main girder was made for a vehicular bridge in reality using the proposed technique. The results indicate that the maximum deflection of box girder under the action of non-uniform shrinkage is much greater than that under the action of uniform shrinkage. The maximum downward deflection of the bridge girder caused by uniform shrinkage is 5.6 mm at 20 years after completion of bridge deck construction, whereas the maximum downward deflection caused by non-uniform shrinkage is 21.6 mm, which is 3.8 times larger. This study shows that the non-uniform shrinkage effect of the girder sections has a significant impact on the long-term deflection of continuous rigid frame bridge, and it can be accurately simulated by the proposed transformation technique.

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