Hydraulic Investigation of a Unique Proposal for the Carrot River Bridge Crossing

1975 ◽  
Vol 2 (1) ◽  
pp. 10-21 ◽  
Author(s):  
Cliff D. Smith
Keyword(s):  
Crossing Over ◽  
Compacted Clay ◽  
Hydraulic Failure ◽  
Model Study ◽  
High Flows ◽  
Bridge Crossing ◽  
Bridge Failure ◽  
Earth Fill ◽  
Geotechnical Studies ◽  
Low Shear

This paper gives details of the hydraulic investigation carried out for the proposed new bridge crossing over the Carrot River on Highway No. 23, near Carrot River, Saskatchewan. Geotechnical studies indicated that due to the very low shear strength of the highly plastic clay comprising the banks of the Carrot River, the river banks would not be capable of supporting the approach fills to the bridge. Highways Department engineers came up with the rather novel idea of placing a compacted clay fill or berm across the river at the bridge site in order to stabilize the banks. This introduced the problem of passing river flows through and over the berm. It was proposed that low flows should be carried through the berm by a culvert, and high flows should be passed over the berm by a spillway. Hence, the design envisaged a bridge over an earth fill and a spillway over a culvert, all at one site. A model study was considered essential because of the uncertain hydraulics and because a hydraulic failure could result in bridge failure.

Canal Wave Oscillations from Expansion of I-84 Bridge in Boise, Idaho

2012 ◽  
Vol 2309 (1) ◽  
pp. 200-205
Author(s):  
William Rahmeyer ◽  
J. M. Clegg ◽  
S. L. Barfuss
Keyword(s):  
New York ◽  
Physical Model ◽  
Unique Solution ◽  
Wave Phenomenon ◽  
Bridge Columns ◽  
Bridge Abutments ◽  
Wave Problem ◽  
Model Study ◽  
Bridge Crossing

Recent improvements and the widening of the I-84 Bridge crossing of the New York Canal in Boise, Idaho, have increased the number of bridge columns from 28 to 60. The resulting structure has two parallel rows of columns that extend across the width of the bridge longitudinally within the canal. After the widening of the bridge and addition of the bridge columns, the canal began experiencing an oscillating wave phenomenon that originated from the bridge columns and caused erosion of upstream and downstream canal banks and bridge abutments. A physical model study was conducted to investigate the wave phenomenon and determine what modifications to the columns or canal would be necessary to prevent the wave oscillations. The physical model was successful in simulating the wave phenomenon, and four different modifications for resolving the wave problem were tested in the model. A unique solution was found that used precast nose cones attached to selected columns. The nose cones have been installed in the prototype bridge crossing, and no wave oscillations have occurred since installation. This paper discusses the study to simulate the wave phenomenon and the four modifications that were evaluated to reduce or prevent wave oscillations.

The principles of compiling and the content of the Geocryological Map in the area of the bridge crossing over the Lena River

2021 ◽  
pp. 21-29
Author(s):  
Aliona Shestakova ◽  
Yaroslav Torgovkin
Keyword(s):  
Geological Structure ◽  
Crossing Over ◽  
Clear Understanding ◽  
Altitudinal Belt ◽  
Lena River ◽  
Information Base ◽  
Local Factors ◽  
Geological Surveys ◽  
Bridge Crossing ◽  
Landscape Map

For the safe construction and operation of a bridge it is necessary to have a clear understanding of the landscape, geocryological and hydrogeological features of the territory. In this regard, a review of the geocryological study of the permafrost zone of the bridge crossing area has been prepared; the analysis of the published and archive literature on the geological structure and hydrogeological conditions of the area under study was carried out; field and fund data and data of engineering and geological surveys were studied and analyzed; control and linking field routes and geothermal measurements in wells were carried out. The results obtained in the course of this work served as the basis for the compilation of a permafrost landscape map and then a geocryological map of the bridge over the Lena river in the area of Yakutsk on a scale of 1 : 5 000. The geocryological map shows the spatial heterogeneity of the permafrost-landscape conditions of the territory under consideration due to zonal (altitudinal-belt), regional and local factors. The information base of geocryological characteristics was the data of engineering and geological surveys.

Joint use of the HEC-2 model and a physical model for floodline delineation upstream of a bridge

1989 ◽  
Vol 16 (1) ◽  
pp. 1-7 ◽  
Author(s):  
P. Wisner ◽  
R. Townsend ◽  
J. Sabourin ◽  
D. Leitch
Keyword(s):  
Numerical Model ◽  
Key Words ◽  
Physical Model ◽  
Flood Protection ◽  
The North ◽  
Model Study ◽  
Bridge Crossing ◽  
Thames River ◽  
The Town

This paper reports the findings of a physical model study of backwaters generated in the vicinity of the Queen Street bridge crossing of the North Thames River in the town of St. Marys, Ontario. Flood profiles generated in the physical model are compared with those observed in the field and with "HEC-2"-generated profiles. Certain limitations of the HEC-2 model, in regards to bridge hydraulics, are identified. The physical model is also used to compare several flood protection alternatives for the town, for both the 100- and the 500-year flows. Floodline delineation was based on both physical model and HEC-2 simulations. The former were adopted for the reach simulated by the physical model, with the latter being employed for the reaches upstream of the physically modelled reach. Key words: physical model, numerical model, bridge backwater, floodline delineation.

scholarly journals Effect of Cement on Compressibility and Microstructure of Tropical Peat

2011 ◽  
Vol 261-263 ◽  
pp. 33-37 ◽  
Author(s):  
Sina Kazemian ◽  
Arun Prasad ◽  
Vahed Ghiasi ◽  
Bujang Bin Kim Huat
Keyword(s):  
Shear Strength ◽  
Scanning Electron Micrographs ◽  
X Ray ◽  
Tropical Peat ◽  
Deep Mixing ◽  
Model Study ◽  
Mixing Method ◽  
Scanning Electron ◽  
Problematic Soil ◽  
Low Shear

Peats are geotechnically problematic soil due to their high compressibility and low shear strength. Cement is widely used for the stabilization of peat by deep mixing method (DMM). This paper presents the results of the model study of compressibility property of peats stabilized with cement columns formed by DMM. The results of consolidation test, scanning electron micrographs (SEM) and energy dispersive x-ray spectrometer (EDX) showed that the compressibility of peats can be improved significantly by the installation of cement stabilized columns. The amount of cement used to form the column was observed to influence the engineering behaviour of treated tropical peats and it had more influence on sapric peat than on hemic and fibrous peats.

Stress Formation and Stress Relief within Weld-Affected Zone

2014 ◽  
Vol 1013 ◽  
pp. 182-187
Author(s):  
Boris Semukhin ◽  
Oleg Nekhoroshkov ◽  
Vasilii A. Klimenov ◽  
Vasilii Muzalev
Keyword(s):  
Residual Stresses ◽  
Strain State ◽  
Ultrasound Velocity ◽  
Stress Relief ◽  
Stress And Strain ◽  
Crossing Over ◽  
Know How ◽  
Weld Joints ◽  
Stress Formation ◽  
Bridge Crossing

The paper presents a formation of residual stresses near the weld-affected zone. It is shown that the residual stress values depend on load application and the type of weld joints. The proprietary know-how is suggested for the analysis of stress and strain state using measurement of the ultrasound velocity in weld joints under load. A correlation between effective and residual stresses is shown when testing the bridge crossing over the river Tom (Tomsk, Russia). A method of reducing these stresses using the ultrasonic impact treatment is suggested herein.

A Maneuvering Test Platform Conceptual Design

2007 ◽  
Author(s):  
Carlos Antoˆnio Levi ◽  
Waldir Terra Pinto ◽  
Sebastia˜o C. P. Gomes ◽  
Joel Sena Sales Junior ◽  
Paulo Roberto da Costa ◽  
...  
Keyword(s):  
Conceptual Design ◽  
Degrees Of Freedom ◽  
Technical Specification ◽  
Ocean Basin ◽  
Crossing Over ◽  
General Description ◽  
Harmonic Motion ◽  
Test Platform ◽  
Bridge Crossing ◽  
Main Bridge

This work discusses the conceptual design of a maneuvering test platform to be installed at the LABOCEANO ocean basin. The platform features a 35m long main bridge, crossing over the whole basin width. A secondary trolley runs along the main bridge, connected to the model. The combination of the bridge and trolley motions can impose a very flexible range of trajectories to the model. The trolley will be equipped with special devices which enable the imposition of harmonic motion up to four degrees of freedom simultaneously. The platform technical specification includes longitudinal and transversal velocities up to 1 m/s, acceleration up to 0.2 m/s, and maximum trajectory diameter of 26m. The amplitude and frequency of the forced harmonic motion may read 0.5 m and 0.2 Hz for surge and sway; 0.15 m and 2 Hz in heave; 10 degrees and 2 Hz in roll and pitch; and 30 degrees and 0.5 Hz in yaw. The work features a general description of the platform design with special emphasis in the structural, mechanical, control and safety aspects.

scholarly journals Construction of a bridge crossing over the Volga in Dubna, Moscow Region

2019 ◽  
Vol 6 (3) ◽  
Author(s):  
Artur Kapikyan ◽  
Natalya Voytseshchuk
Keyword(s):  
Traffic Congestion ◽  
Transport Infrastructure ◽  
Moscow Region ◽  
Hydropower Plant ◽  
Crossing Over ◽  
Design Work ◽  
Processing Centre ◽  
Bridge Crossing ◽  
The Right ◽  
The City

The article describes the construction of a unique bridge crossing in Dubna, Moscow Region. Design work started at the beginning of the 2000s. Several options were suggested, clients and design companies changed several times. In 2016, the construction of the bridge crossing over the Volga started. “Institute Giprostroymost” JSC was chosen as a general designer. A range of engineering surveying was carried out and work paper was worked out by the company. The location of the city on the banks of the Volga determined a sustained transport problem. The shortest crossing of the right and left banks was provided by Ivankovskaya hydropower plant. Actual traffic capacity of the crossing was not enough, and this led to regular traffic congestion. The nearest bridge was situated at the distance of 30 km, in the town of Kimry in the Tverskaya Region. The transport infrastructure situation hampered the development of the “Dubna” special economic zone of technology and innovation type which includes an innovation territorial cluster of nuclear-physical and nanotechnologies as well as the city of Dubna itself. Transport accessibility to the Federal Data Processing Centre of the Federal Tax Service of Russia was also limited. The bridge crossing has 4 lanes and consists of motor road approaches and a highway bridge. Shipping length of the bridge with approaches is 1939,93 m. Shipping length together with the length of the ramps is 2997,99 m. Total length of the bridge crossing accounts for 1 166,25 m. Central navigation span is 168,0 m. The construction of the bridge crossing was carried out within the minimum time limit. 24 months after the erection of the bridge started, in November 2018, the bridge was put into operation.

BRIDGES - Some Concept Designs for Istanbul

2021 ◽  
Author(s):  
Alessandro Stocco ◽  
Enzo Siviero
Keyword(s):  
Design Process ◽  
The Other ◽  
Crossing Over ◽  
Basic Principles ◽  
Dynamic Image ◽  
The Future ◽  
Points Of View ◽  
Bridge Crossing ◽  
Pedestrian Crossing ◽  
The City

<p>This paper illustrates some examples of designs created for Istanbul: a metropolis divided between two continents which, on one hand, still shines with the glories of imperial history, and, on the other, represents the most modern and dynamic image of Turkey. The city is a very complex metropolis, constantly evolving and full of contradictions, in need of attention from functional, historical, and social points of view.</p><p>The architectural concepts proposed here attempt to reflect these needs by offering solutions that, while responding to the city’s current functional, social, and transportation needs, also look to the future by outlining the development of the areas for which each bridge has been designed.</p><p>The case of a pedestrian crossing over the enlarged Kennedy Street; the Şirinevler Footbridge; the case of the Yeni Gezi Footbridge in the Gezi Park; a panoramic terrace overlooking the Bosporus in the Beykoz District; a ribbon stressed footbridge crossing the Mahmutbey Yesilkoy Baglanti Yolu in the area of Çobançeşme; and the design for the Sünnet Bridge crossing the river Cendere at its confluence with the Haliç.</p><p>These are the cases for which concept proposals are described in this paper reporting the basic principles that governed the design of the concept, and in doing so, to underline how important the anthropologic and cultural points of view are in the design process.</p>

Social Desirability in Personality Inventories

2014 ◽  
Vol 35 (3) ◽  
pp. 144-157 ◽  
Author(s):  
Martin Bäckström ◽  
Fredrik Björklund
Keyword(s):  
Social Desirability ◽  
Big Five ◽  
Work Performance ◽  
Factor Model ◽  
Five Factor Model ◽  
Peer Ratings ◽  
Personality Inventories ◽  
Model Study ◽  
The Difference ◽  
New Variables

The difference between evaluatively loaded and evaluatively neutralized five-factor inventory items was used to create new variables, one for each factor in the five-factor model. Study 1 showed that these variables can be represented in terms of a general evaluative factor which is related to social desirability measures and indicated that the factor may equally well be represented as separate from the Big Five as superordinate to them. Study 2 revealed an evaluative factor in self-ratings and peer ratings of the Big Five, but the evaluative factor in self-reports did not correlate with such a factor in ratings by peers. In Study 3 the evaluative factor contributed above the Big Five in predicting work performance, indicating a substance component. The results are discussed in relation to measurement issues and self-serving biases.

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