Field observations of river bed scour on the Peace River near Fort Vermilion, Alberta

1984 ◽  
Vol 11 (4) ◽  
pp. 782-797 ◽  
Author(s):  
R. Alex Harrington ◽  
D. G. McLean
Keyword(s):  
Field Measurements ◽  
Local Scour ◽  
Bridge Structure ◽  
Pier Scour ◽  
Box Girder ◽  
Peace River ◽  
River Bed ◽  
Predicted Values ◽  
Girder Bridge ◽  
Bed Scour

The results of field measurements of general and local scour on the Peace River at Fort Vermilion, Alberta are presented. The Peace River, the largest sand bed river in Alberta, has been regulated by the W. A. C. Bennett Dam since 1968, resulting in a general reduction in spring and summer discharges. Between 1971 and 1974 a 532 m twin box girder bridge structure, supported on steel H piles, was constructed at Fort Vermilion. A number of channel surveys have been carried out at the site at various discharges, providing considerable data with which to evaluate scour formulae used in practice. Comparison of measured results with predicted values of general scour indicates that most equations provide results in general agreement with the observed data, even though some of the regime equations may not be appropriate to sites with significant contractions. Computed local pier scour was generally greater than that measured at the site, although this is partly because of the nature of the pier footing configuration, which tended to arrest local scour. Key words: hydraulics, regime, rivers, sediment, scour.

Construction Monitoring Technology for Large-Span PC Continuous Box-Girder Bridge with Corrugated Steel Webs

2014 ◽  
Vol 1065-1069 ◽  
pp. 865-869
Author(s):  
Zhao Cai Liu ◽  
Lin Jie Hou ◽  
Can Hua Chang ◽  
Chong Hui Zhou ◽  
Shui Wan
Keyword(s):  
Field Measurements ◽  
Box Girder ◽  
Construction Monitoring ◽  
Large Span ◽  
Element Simulation ◽  
Single Room ◽  
Design Requirements ◽  
Box Girder Bridge ◽  
Girder Bridge ◽  
And Control

Through the construction monitoring of a large-span bridge which is a single box single room PC continuous box-girder bridge with corrugated steel webs, suitable methods are summed up. Finite element simulation was combined with field measurements data to calculate the model elevation of construction. By adjusting and control the model elevation, the linear shape of the bridge met the design requirements. By collecting strain data of the key sections of the bridge, abnormalities that may exist could be detected timely so that early warning could be made and construction safety and quality could be ensured.

Study and Application of Bridge Structure Finite Element Model Updating Based on Static-Load Testing

2011 ◽  
Vol 201-203 ◽  
pp. 2672-2678
Author(s):  
Miao Yi Deng ◽  
Fuen Li
Keyword(s):  
Finite Element ◽  
Static Load ◽  
Model Updating ◽  
Fe Model ◽  
Bridge Structure ◽  
Load Testing ◽  
Box Girder ◽  
Girder Bridge ◽  
Fe Model Updating ◽  
Static Load Testing

A method for continuous box-girder bridge structure finite element (FE) model updating based on static-load testing is proposed. The procedure includes field static-load testing, FE modeling, FE model (parameter) updating, etc. Based on this procedure, the structure FE model updating for an expressway 5-span pre-stressed concrete continuous box-girder bridge is conducted. And the bridge structure static FE model, which is consistent with the static-load testing actual measure response, is gained. The updated FE model (parameter) is foundation of structural performance evaluation for the bridge.

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.

Live load field test on the Muskwa River Bridge

1978 ◽  
Vol 5 (2) ◽  
pp. 186-201 ◽  
Author(s):  
M. S. Cheung ◽  
M. Y. T. Chan
Keyword(s):  
Cross Sections ◽  
Load Distribution ◽  
Beam Theory ◽  
Field Measurements ◽  
Live Load ◽  
Box Girder ◽  
Design Values ◽  
Girder Bridge ◽  
Live Load Distribution ◽  
Theory Calculation

The performance of a steel–concrete composite box-girder bridge is examined through a series of live load field measurements. This paper describes the measurement program and the results obtained, as well as comparisons wherever possible between the observed values and those obtained from beam theory calculations and bridge code equations. It was found that the measured strains were generally much lower than the design values and that for bridges with asymmetrical cross sections, a beam theory calculation using bridge code live load distribution formulas can lead to nonconservative results.

scholarly journals Mathematical Modeling of Local Scour at Slender and Wide Bridge Piers

2016 ◽  
Vol 2016 ◽  
pp. 1-19 ◽  
Author(s):  
Youssef I. Hafez
Keyword(s):  
Local Scour ◽  
Bridge Pier ◽  
Angle Of Repose ◽  
Bridge Piers ◽  
Bridge Scour ◽  
Pier Scour ◽  
Bed Scour ◽  
Bed Material ◽  
Bridge Pier Scour ◽  
Mitigation Methods

Most existing equations for predicting local scour at bridge piers suffer from overprediction of the scour depths which results in higher foundation costs. To tackle this problem, a mathematical model for predicting bridge pier scour is developed herein based on an energy balance theory. The present study equation was compared to commonly used bridge scour equations using scour field data in USA. The developed equation has several advantages among which we have the following: it adds to the understanding of the physics of bridge pier scour, is valid for slender and wide piers, does not suffer from overprediction of scour depths, addresses clear water and live bed scour, and includes the effects of various characteristics of the bed material such as specific gravity (or density), porosity, size, and angle of repose. In addition, the developed equation accounts for the debris effect and aids in the design of scour mitigation methods such as collars, side bars, slots, and pier protective piles.

Rehabilitation of the Boivre Viaduct - A Multispan Prestressed Box Girder Bridge

PCI Journal ◽  
1986 ◽  
Vol 31 (3) ◽  
pp. 22-47 ◽  
Author(s):  
Charles C. Zollman ◽  
Serge H. Barbaux
Keyword(s):  
Box Girder ◽  
Box Girder Bridge ◽  
Girder Bridge

scholarly journals Mechanical Performance of a Ballastless Track System for the Railway Bridges of High-Speed Lines: Experimental and Numerical Study under Thermal Loading

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2876
Author(s):  
Yingying Zhang ◽  
Lingyu Zhou ◽  
Akim D. Mahunon ◽  
Guangchao Zhang ◽  
Xiusheng Peng ◽  
...  
Keyword(s):  
High Speed ◽  
Thermal Loading ◽  
Mechanical Performance ◽  
Track Structure ◽  
Box Girder ◽  
High Speed Railway ◽  
Ballastless Track ◽  
Track System ◽  
Girder Bridge ◽  
Track Slab

The mechanical performance of China Railway Track System type II (CRTS II) ballastless track suitable for High-Speed Railway (HSR) bridges is investigated in this project by testing a one-quarter-scaled three-span specimen under thermal loading. Stress analysis was performed both experimentally and numerically, via finite-element modeling in the latter case. The results showed that strains in the track slab, in the cement-emulsified asphalt (CA) mortar and in the track bed, increased nonlinearly with the temperature increase. In the longitudinal direction, the zero-displacement section between the track slab and the track bed was close to the 1/8L section of the beam, while the zero-displacement section between the track slab and the box girder bridge was close to the 3/8L section. The maximum values of the relative vertical displacement between the track bed and the bridge structure occurred in the section at three-quarters of the span. Numerical analysis showed that the lower the temperature, the larger the tensile stresses occurring in the different layers of the track structure, whereas the higher the temperature, the higher the relative displacement between the track system and the box girder bridge. Consequently, quantifying the stresses in the various components of the track structure resulting from sudden temperature drops and evaluating the relative displacements between the rails and the track bed resulting from high-temperature are helpful in the design of ballastless track structures for high-speed railway lines.

Evaluation of Selected Pier-Scour Equations Using Field Data

1996 ◽  
Vol 1523 (1) ◽  
pp. 186-195 ◽  
Author(s):  
Mark N. Landers ◽  
David S. Mueller
Keyword(s):  
Field Measurements ◽  
Bridge Piers ◽  
Critical Ratio ◽  
Scour Depth ◽  
Flow Depth ◽  
Clear Water ◽  
Pier Scour ◽  
Logarithmic Space ◽  
State Highway ◽  
Federal Highway

Field measurements of channel scour at bridges are needed to improve the understanding of scour processes and the ability to accurately predict scour depths. An extensive data base of pier-scour measurements has been developed over the last several years in cooperative studies between state highway departments, the Federal Highway Administration, and the U.S. Geological Survey. Selected scour processes and scour design equations are evaluated using 139 measurements of local scour in live-bed and clear-water conditions. Pier-scour measurements were made at 44 bridges around 90 bridge piers in 12 states. The influence of pier width on scour depth is linear in logarithmic space. The maximum observed ratio of pier width to scour depth is 2.1 for piers aligned to the flow. Flow depth and scour depth were found to have a relation that is linear in logarithmic space and that is not bounded by some critical ratio of flow depth to pier width. Comparisons of computed and observed scour depths indicate that none of the selected equations accurately estimate the depth of scour for all of the measured conditions. Some of the equations performed well as conservative design equations; however, they overpredict many observed scour depths by large amounts. Some equations fit the data well for observed scour depths less than about 3 m (9.8 ft), but significantly underpredict larger observed scour depths.

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