scholarly journals Segmental Intelligent Model Test of Box Girder Bridge Strengthened By a Cable-Stayed System by Mathematical Calculation

2021 ◽  
Vol 2083 (4) ◽  
pp. 042051
Author(s):  
Xianggang Wang ◽  
Yongli Shen ◽  
Yongcheng Yang ◽  
Xinxin Zhou ◽  
Gangnian Xu ◽  
...  
Keyword(s):  
Model Test ◽  
Yellow River ◽  
Scale Model ◽  
Highway Bridge ◽  
Test Results ◽  
Box Girder ◽  
Concrete Box Girder ◽  
Girder Bridge ◽  
Main Girder ◽  
Intelligent Model

Abstract Dongming Yellow River Highway Bridge is an important super large bridge across the Yellow River on national highway 106. In order to effectively improve the cracking and deflection of the bridge, the cable-stayed system is used to reinforce the main girder of the project. In order to analyze the stress state of joist, bracket and box girder, the static loading of cable is carried out through scale model test to study the mechanical properties of concrete box girder segment, joist and bracket, verify the reliability of bracket and concrete box girder anchorage, and optimize the reinforcement method of cable-stayed system according to the test results.

scholarly journals Diffusion Behavior of Chloride Ions in Concrete Box Girder under the Influence of Load and Carbonation

Materials ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2117
Author(s):  
Yinglong Liu ◽  
Pengzhen Lin ◽  
Junjun Ma
Keyword(s):  
Coupling Effect ◽  
Chloride Concentration ◽  
Chloride Ion ◽  
Chloride Ions ◽  
Ion Concentration ◽  
Scale Model ◽  
Test Results ◽  
Box Girder ◽  
Concrete Box Girder ◽  
The Difference

In order to study the durability degradation characteristics of concrete box girder under load and carbonation and chloride ion erosion, a scale model of concrete box girder was made for experimental research. According to the test results, the diffusion characteristics of chloride ions in the concrete box girder under the coupling effect of load and carbon dioxide were analyzed. By revising the calculation formula of the existing chloride ion concentration considering multiple factors, a calculation model of chloride ion concentration considering the influence of carbonation was proposed, and the test results were verified. The results show that the chloride concentration of the box girder on the same cross section is non-uniformly distributed due to the shear lag effect and the spatial structure. After considering the effect of carbonation, the difference rate of the improved model proposed in this paper is generally within 10%. Compared with the original model, the difference rate is reduced by a maximum of 19%.

Design Innovation of Large-Span Pre-Stressed Concrete Box Girder Bridge with Corrugated Steel Web

2011 ◽  
Vol 243-249 ◽  
pp. 1682-1688
Author(s):  
Guang Hui Li ◽  
Jian Xun Zhang
Keyword(s):  
Yellow River ◽  
Design Code ◽  
Box Girder Bridges ◽  
Box Girder ◽  
Girder Bridges ◽  
Shear Buckling ◽  
Concrete Box Girder ◽  
Concrete Box Girder Bridges ◽  
Corrugated Steel Web ◽  
Girder Bridge

More and more pre-stressed concrete box-girder bridges with corrugated steel web are being realized in the world due to their advantages over the traditional concrete box girder bridges. Characteristics of corrugated steel web technology were introduced briefly in this paper, and its application in Juancheng Yellow River Bridge was also presented. Calculations on the shear buckling strength of corrugated steel web for Juancheng Yellow River Bridge were performed by the use of design code of Japan. Based on the analysis results, a reasonable way to determine the sizes of corrugated steel web is proposed, and it will provide help for designers when performing a design of pre-stressed box girder with corrugated steel web in China.

Load Testing of a Deteriorated Concrete Box Girder Bridge

2002 ◽  
Vol 5 (2) ◽  
pp. 63-73
Author(s):  
Jun Yang ◽  
John T DeWolf
Keyword(s):  
Load Testing ◽  
Test Results ◽  
Cross Sectional ◽  
Box Girder ◽  
Construction Joint ◽  
Load Carrying ◽  
Concrete Box Girder ◽  
Box Girder Bridge ◽  
Skewed Supports ◽  
Girder Bridge

This paper reports on load testing of a continuous three cell concrete box girder bridge. The bridge is non-prismatic, curved in plan, and has skewed supports. The bridge is over thirty years old, and it was designed with a construction joint between two continuous spans and a span with a cantilever. The tests were carried out to evaluate the cause of large cracks extending through most of the height in some of the webs. Evaluation of the test results has shown that the distribution of strains in the bridge is significantly different than assumed in design. This has resulted in a redistribution of the load carrying capacity across the bridge. It is concluded that this is due to the varying cross-sectional dimensions and the reductions in the stiffness that occurs following development of the major cracks. The test results have been used to evaluate the bridge's overall behaviour and condition.

A New Widening Method of Reinforced Concrete Box Girder and its Experimental Research

2010 ◽  
Vol 163-167 ◽  
pp. 3724-3729
Author(s):  
Qian Wang ◽  
Lei Shi ◽  
Zhe Zhang
Keyword(s):  
Mechanical Properties ◽  
Reinforced Concrete ◽  
Experimental Research ◽  
Model Test ◽  
Full Scale ◽  
Scale Model ◽  
Box Girder ◽  
Concrete Box Girder

This paper introduces a new box girder widening method- Steel cantilever widening concrete box girder method without piers (SCWCGM for short). Without additional piers, SCWCGM can still meet the need of widening range, which is an effective widening method for urban bridges. In this paper, the widening conception and the structure style of SCWCGM is detailed. In order to study the mechanical properties of this method, the full-scale model test was conducted. The results show that, the SCWCGM is reasonable and feasible.

scholarly journals The Analysis of Thermal Effect on Concrete Box Girder Bridge

2015 ◽  
Vol 111 ◽  
pp. 470-477 ◽  
Author(s):  
Lukáš Krkoška ◽  
Martin Moravčík
Keyword(s):  
Thermal Effect ◽  
Box Girder ◽  
Concrete Box Girder ◽  
Box Girder Bridge ◽  
Girder Bridge

A study of modeling experiments of the vibration behavior of elevated railway box girder

2018 ◽  
Vol 25 (5) ◽  
pp. 984-995 ◽  
Author(s):  
Kun Luo ◽  
Xiaoyan Lei
Keyword(s):  
High Speed ◽  
Similarity Theory ◽  
Longitudinal Direction ◽  
Calculation Model ◽  
Scale Model ◽  
Box Girder ◽  
Vibration Transmissibility ◽  
Girder Bridge ◽  
Structure Simplification ◽  
Model Similarity

Based on the model similarity theory, this article deduces the model similarity relationship of the elevated railway box girder at the elastic stage and designs a 1/10 box girder scale model by adopting a 32 m simply-supported box girder bridge from the Beijing–Shanghai Railway as the prototype. It then verifies the validity of the model design and the dynamic similarity between the 1/10 model and the prototype through constraint mode and free mode experiments on the 1/10 scale model, together with transient finite element calculation. The dynamic calculation model is utilized here for the analysis of the errors occurring in the production of the model, and the effect of the model structure simplification on the box girder mode frequency and vibration response. Finally, the article studies the vibration transmissibility characteristics between the plates and along the longitudinal direction by means of model testing. It also discusses the effect of different bridge support stiffness on the box girder vibration. The results presented in this paper can provide a method for forecasting and evaluating the existing or plan-to-build high speed railway environment vibration.

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