The Special Construction Scheme Exploration of the South-to-North Water Transfer Project Approach Bridge in the Upper Box Girder Bridge

2013 ◽  
Vol 368-370 ◽  
pp. 1481-1486
Author(s):  
Ze Jun Liu ◽  
Cheng Qian ◽  
Qing Shan Zheng ◽  
Wen Bin Sun ◽  
Yun Dong ◽  
...  
Keyword(s):  
Large Scale ◽  
Water Transfer ◽  
Box Girder ◽  
Project Approach ◽  
Construction Scheme ◽  
North Water ◽  
Girder Bridge ◽  
Main Bridge ◽  
Better Than

In this paper, combined with the approach bridge of cast-in-place continuous box girder project,discussion on the main bridge construction with support cast-in-place scheme design.The role of a great reference for large-scale projects,from the implementation of the index statistics, analysis shows that, to achieve even better than the specification requirements, and achieved the desired results.

Thermal Stress Analysis of Large Scale U-Shaped Aqueduct

2012 ◽  
Vol 238 ◽  
pp. 325-328
Author(s):  
Jian Hua Zhang
Keyword(s):  
Thermal Stress ◽  
Large Scale ◽  
Thermal Analyses ◽  
Water Diversion ◽  
Bridge Structure ◽  
Box Girder ◽  
Operational Process ◽  
North Water ◽  
Girder Bridge ◽  
Transient Thermal

The aqueduct is one of large scale water conservancy project across river, which is the first level of anti-cracking structure with rigorous control of cracks. At present, the thermal analysis of aqueduct structure most borrows ideas from box-girder bridge structure without considering their difference. As the thermal stress of large-scale concrete structure during construction and operational process is redoubtable, the U-shaped model of a practical aqueduct of South-to-North Water Diversion is established to do the steady and transient thermal analyses. The result shows that the structure of U-shaped aqueduct is reasonable, it is not necessary to take special measures to control the temperature during the construction and operational process.

Analysis of Crack Initiation and Treatment in the South-to-North Water Diversion Suining Two Station Project

2013 ◽  
Vol 368-370 ◽  
pp. 1123-1127
Author(s):  
Ze Jun Liu ◽  
Jun Hao Wang ◽  
Qing Shan Zheng ◽  
Yue Xin She ◽  
Yi Jiang
Keyword(s):  
Crack Initiation ◽  
Large Scale ◽  
Water Diversion ◽  
Regulatory Requirements ◽  
Substantial Impact ◽  
Geological Conditions ◽  
Project Construction ◽  
Long Time ◽  
North Water ◽  
Better Than

For projects, especially large-scale projects, due to the long time of project construction, the construction of the complexity of the geological conditions, sometimes inevitably lead to quality defects.How scientific and reasonable quality defects hidden works to take remedial measures, or effective correction to restore the loss of time, cost, quality, safety,become an important engineering problem.Some cracks, will not have a substantial impact on the project, you can take measures to deal with to ensure proper implementation of the project.The article takes the analysis of crack initiation and Treatment in the Suining two station project.There are a lot of reference in processing defects in the country's large projects.Statistical indicators from the implementation of the results, analysis shows that to achieve even better than the regulatory requirements, and achieved the expected results.

Study of Shear Deformation's Influence on Deflection of Continuous Composite Box-Girder Bridge with Corrugated Steel Webs

2013 ◽  
Vol 275-277 ◽  
pp. 961-965
Author(s):  
Ming Min Tang ◽  
Li Chao Su ◽  
Shui Wan
Keyword(s):  
Shear Deformation ◽  
Water Diversion ◽  
Uniform Load ◽  
Box Girders ◽  
Concentrated Force ◽  
Element Analysis ◽  
Box Girder ◽  
North Water ◽  
Box Girder Bridge ◽  
Girder Bridge

Taking South-to-North Water Diversion Bridge, a continuous composite box-girder bridge with corrugated steel webs, as the engineering background, the cantilever beam end’s deflection calculation formulae considering shear deformation were deduced by using energy method. Comparing with finite-element analysis (FEA) values and measured values, the formulae which considered both concentrated force and uniform load have enough accuracy. Results show that, shear deformation’s proportion is more obvious in overall deflection of such box-girders which have smaller span ratio, and it’s more than 30%. For continuous composite box-girder bridge with corrugated steel webs, contribution of shear deformation to overall deflection should not be ignored.

Monitoring and structural analysis of a rehabilitated box girder bridge based on long-gauge strain sensors

2017 ◽  
Vol 17 (3) ◽  
pp. 586-597
Author(s):  
Huang Huang ◽  
Zhishen Wu
Keyword(s):  
Strain Distribution ◽  
Large Scale ◽  
Dynamic Strain ◽  
Strain Sensing ◽  
Element Analysis ◽  
Box Girder ◽  
Damage Models ◽  
Structural Rehabilitation ◽  
Box Girder Bridge ◽  
Girder Bridge

Structural rehabilitation is playing an increasingly important role in civil engineering owing to issues with aging infrastructure. In this context, a feasible inspection and monitoring system is needed to draw up effective structural rehabilitation projects. This article presents a case study of a real box girder bridge strengthened via external post-tensioning. With the aim of evaluating the strengthening project and the structural behavior changes, a large-scale strain sensing system containing four sensing areas was installed on the bridge before strengthening, and the static and dynamic strain distribution changes were recorded during annual inspections. The text focuses on discussing and comparing the variations of strain distribution across the bridge before and after strengthening, as well as the yearly changes the rehabilitated bridge has undergone. From the measured strain responses, we accurately determined that the rehabilitated bridge had undergone an unexpected reduction in its flexural stiffness as well as a torsion action. Moreover, finite element analysis results of three different damage models are discussed to understand the detailed cause for this.

Numerical Analysis on the Dynamic Characteristics of South-to-North Water Division Bridge during the Cantilever Construction Stage

2012 ◽  
Vol 204-208 ◽  
pp. 2200-2204
Author(s):  
Jun Chao Zuo
Keyword(s):  
Numerical Analysis ◽  
Dynamic Characteristics ◽  
Prestressed Concrete ◽  
Construction Stage ◽  
Modal Shape ◽  
Box Girder ◽  
Modal Frequency ◽  
North Water ◽  
Girder Bridge ◽  
Cantilever Construction

The South-to-North Water Division Bridge is a prestressed concrete composite box-girder bridge with corrugated steel webs constructed by cast-in-place cantilever method. Its modal shape and modal frequency were calculated during each cantilever construction stage. And the formula about the relation between length of cantilever and natural frequency was derived.

Design Analysis of Shuangji River Drainage Aqueduct Body with Large Flow

2012 ◽  
Vol 238 ◽  
pp. 333-336
Author(s):  
Guang Wei Feng ◽  
Ying Gao
Keyword(s):  
Structural Design ◽  
Water Transfer ◽  
Structural Form ◽  
Typical Structure ◽  
River Drainage ◽  
Structural Style ◽  
Construction Scheme ◽  
Structural Types ◽  
North Water ◽  
Large Flow

On the basis of summarizing the completed structural types of aqueduct both at home and abroad, combined with the structural design of Shuangji River drainage aqueduct in China South-to-north Water Transfer Project (SNETP), the aqueduct body structural form was selected. The analysis and discussion has been done with three typical structure forms of Shuangji River aqueduct, the two mechanical construction schemes by aqueduct-making machine and aqueduct-installing machine have been researched. The results show that the aqueduct with the character of large flow, big section, large loads and gentle gradient should be comprehensive analyzed on the mechanical behavior, construction scheme and construction cost to select the appropriate structural style for improving the quality and efficiency. The results provide valuable reference for designing the similar aqueduct.

The Better-Than-Average Effect in the Era of COVID-19: Cognitive Bias in the Age of Pandemic and its Relationship to Vaccination Hesitancy (Preprint)

2021 ◽  
Author(s):  
Wojciech Kulesza ◽  
Dariusz Dolinski ◽  
Paweł Muniak ◽  
Daisy Winner ◽  
Kamil Izydorczak ◽  
...  
Keyword(s):  
Public Health ◽  
Global Health ◽  
Large Scale ◽  
Cognitive Biases ◽  
Average Effect ◽  
Health Crisis ◽  
Scale Behavior ◽  
Vaccination Hesitancy ◽  
Better Than

BACKGROUND The ongoing coronavirus pandemic is an unprecedented global health crisis. Because large-scale behavior change has been critical to slowing the spread of the virus, understanding the mechanisms behind people’s decisions and behaviors to follow (or not) public health recommendations, is essential. OBJECTIVE In order to investigate one possible mechanism, we investigated the presence of the better-than-average effect. METHODS in 3066 individuals across Poland, Iran, and Kazakhstan. RESULTS Participants demonstrated clear the BTAE in all three countries. Furthermore, we found that the level of BTAE was a predictor of COVID-19 vaccination (declarative) claims. CONCLUSIONS These findings contribute to the growing literature on the role of cognitive biases on health behaviors, particularly during global health emergencies. We provide recommendations for public health communicators on how to address this bias to help ensure people adopt the behaviors that are critical to combatting the virus.

Simplified Analysis of Longitudinal Stiffened Plates in a Continuous Steel Box Girder Bridge

2012 ◽  
Vol 178-181 ◽  
pp. 2526-2529
Author(s):  
Hui Zhang ◽  
Zhuo Ya Yuan ◽  
Shi Zhong Liu ◽  
Zi Jiang Yang ◽  
Xiong Wei Shi
Keyword(s):  
Large Scale ◽  
Discrete Models ◽  
Box Girder Bridges ◽  
Box Girder ◽  
Girder Bridges ◽  
Numerical Studies ◽  
Steel Box Girder ◽  
Large Width ◽  
Girder Bridge ◽  
Steel Box Girder Bridge

This paper investigates the thin-walled box girder bridges with large width-to-span ratios through both experimental and numerical studies. For the complexity of the bridge, different discrete models are presented in the analyzing of the longitudinal stiffened plate. In addition, a large-scale Plexiglas model is tested under different loading cases. The simplified simulation of the computation results compared well with the experimental results. It is illustrated that it is an effective method to predict properties of this kind of bridges.

Stress Analysis of CFRP Externally Pre-Stressed Reinforcement Continuous Beam

2014 ◽  
Vol 1028 ◽  
pp. 300-304
Author(s):  
Xin Zhong Wang ◽  
Chuan Xi Li
Keyword(s):  
Stress Analysis ◽  
Tension Control ◽  
Continuous Beam ◽  
Box Girder Bridges ◽  
Box Girder ◽  
Girder Bridges ◽  
Steel Strand ◽  
Girder Bridge ◽  
External Loads ◽  
Better Than

An externally pre-stressed continuous box girder bridge is designed according to loading features of the continuous beam. The CFRP bars and steel strands are used to make two models for externally pre-stressed reinforcements at the supporting points. CFRP reinforcement area of Model 1 at the supporting point is 1/2 of steel strand externally pre-stressed reinforcements of model 2 at the supporting points. After the calculation, we can find that under effects of the same tension control stress and the external loads, mechanical effects of the continuous box girder bridges with CFRP bars can be equal to or better than performances of continuous box girder bridges with steel strands. They can provide references to applications of CFRP bar.

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