The Twelve Mile Creek bridges—Design and construction

The two bridges featured are precast segmental concrete box girders built by the balanced cantilever method. Crossing a hydro tailrace, this $11 million project forms a part of the new Highway 406 through St. Catharines, Ontario. Several unique features of the structures are highlighted. These features include transverse rib beams employed at each segment face to support the deck slab; flaring of the deck slabs to accommodate on and off ramps; and twisting horizontal alignment of the highway. Both bridges have a depth-to-span ratio of 1:27, which results in one of the most slender precast box girder bridges built by the balanced cantilever method. The construction phase of this project is reviewed with particular attention to the casting operation and to the erection of the segments employing a steel launching truss. Design- and construction-related problems encountered are presented and reveal that the more perplexing problems are generally those not related to the complexities of the segmental form of construction but rather to the more mundane aspects of posttensioned concrete bridge construction. Key words: precast segmental concrete box girder bridges, balanced cantilever methods, steel launching truss, short line casting bed.

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Assessment and identification of concrete box-girder bridges

IABSE Symposium, Guimarães 2019: Towards a Resilient Built Environment Risk and Asset Management ◽

10.2749/guimaraes.2019.0218 ◽

2019 ◽

Author(s):

Edward A. Baron

Keyword(s):

Neural Network ◽

Health Monitoring ◽

Concrete Bridge ◽

Fe Model ◽

Box Girder Bridges ◽

Box Girder ◽

Damage Scenarios ◽

Girder Bridges ◽

Concrete Box Girder Bridges ◽

Girder Bridge

<p>This work consists in identify and assess the properties related to material, geometry and physic sources, in a pre-stressed concrete bridge through a surrogate model. The use of this mathematical model allows to generate a relationship between bridge properties and its dynamic response, with the purpose to develop a tool to predict the analytical values of the studied properties from measured eigenfrequencies. Therefore, it is introduced the identification of damage scenarios, giving the application for validate the generated metamodel (Artificial Neural Network). A FE model is developed to simulate the studied structure, a Colombian bridge called "El Tablazo", one of the higher in the country of this type (box-girder bridge). Once the damage scenarios are defined, this work allows to indicate the basis for futures plans of structural health monitoring.</p>

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Numerical Analysis of Temperature Influence on Transverse Cracks in Concrete Box-Girder Bridges

Mathematical Problems in Engineering ◽

10.1155/2020/3295037 ◽

2020 ◽

Vol 2020 ◽

pp. 1-11

Author(s):

Hanzheng Xu ◽

Xiaofeng Yan

Keyword(s):

Numerical Analysis ◽

Highway Bridges ◽

Hydration Reaction ◽

Box Girders ◽

Transverse Cracks ◽

Box Girder Bridges ◽

Box Girder ◽

Girder Bridges ◽

Concrete Box Girder ◽

Concrete Box Girder Bridges

Concrete box-girder bridges are widely used in China. During several routine inspections of two-year-old highway bridges of this type in the China Central Plains region, we found that transverse cracks are widespread on the bottom flanges of those box girders, mainly distributed in the area of 1/4L to 3/4L of the span. Selected cracks were then monitored continuously for one year. Our results showed that there had been no change in the widths of the cracks, but their lengths had increased and new cracks had formed. Taking into consideration factors like hydration reaction, relative humidity difference, shrinkage and creep, sunlight thermal differential effect, sudden temperature change, vehicle load, and their combined efforts, we have developed spatial structural models and conducted stress analyses on the reinforced concrete and prestressed concrete box-girder bridges, respectively. Our numerical analysis results indicated that the hydration reaction is the main reason for the initial bottom flange crack and the temperature difference between the inside and the outside of the box girders caused the crack developments at the later stage.

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Local Dynamic Response in Deck Slabs of Concrete Box Girder Bridges

Computational Structural Engineering ◽

10.1007/978-90-481-2822-8_84 ◽

2009 ◽

pp. 771-779

Author(s):

Jianrong Yang ◽

Jianzhong Li

Keyword(s):

Dynamic Response ◽

Local Dynamic ◽

Box Girder Bridges ◽

Box Girder ◽

Girder Bridges ◽

Deck Slabs ◽

Concrete Box Girder ◽

Concrete Box Girder Bridges

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Load Distribution In Adjacent Precast "Deck Free" Concrete Box-Girder Bridges

10.32920/ryerson.14644587.v1 ◽

2021 ◽

Author(s):

Waqar Khan

Keyword(s):

Prestressed Concrete ◽

Precast Concrete ◽

Box Girders ◽

Box Girder Bridges ◽

Box Girder ◽

Girder Bridges ◽

Concrete Box Girder ◽

Concrete Box Girder Bridges ◽

Girder Bridge ◽

The Moment

Bridges built with adjacent precast, prestressed concrete box-girders are a popular and economical solution for short-span bridges because they can be constructed rapidly. The top flanges of the precast box girders form the bridge deck surface. A shear key is introduced between the adjacent boxes over the depth of the top flange (i.e. 225 mm thick as the thickness of the box's top flange). Canadian Highway Bridge Design Code, CHBDC specifies empirical equations for the moment and shear distribution factors for selected bridge configurations but not for adjacent precast concrete box-girder bridge type. In this study, a parametric study was conducted, using the 3D finite-element modeling, and a set of simplified equations for the moment, shear and deflection distribution factors for the studied bridge configuration was developed.

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Modelling noise radiation from concrete box girder bridges as an infinitely long periodic structure excited by a high-speed train

Journal of Vibration and Acoustics ◽

10.1115/1.4050428 ◽

2021 ◽

pp. 1-33

Author(s):

Yuanpeng He ◽

Gong Cheng ◽

Jian Han ◽

Xiaozhen Sheng

Keyword(s):

Vibration Frequency ◽

High Speed ◽

Sound Radiation ◽

Box Girders ◽

Box Girder Bridges ◽

Frequency Spectra ◽

Box Girder ◽

Noise Radiation ◽

Girder Bridges ◽

Concrete Box Girder Bridges

Abstract Concrete box girder bridges occupy over 80% of the total mileage of the Chinese high-speed railway. The box girder structure has many natural modes of low frequencies, which can be excited by a train passing at high speed, generating low-frequency bridge noise. This paper is concerned with the prediction of such bridge noise and reports a prediction model. The model, as other existing models of the same nature, also incorporates two parts, one dealing with vehicle-track-viaduct dynamics and the other dealing with sound radiation from the girders, but takes into account more features related to high speed. In this model, vehicle-track-viaduct dynamics is dealt with in the frequency-domain based on the theory of infinitely long periodic structure and the Fourier-series method, predicting vibration frequency spectra for each and every box girder. The predicted vibration frequency spectra of all the box girders are expressed as a sum of propagating waves at different wavenumbers, and sound radiation from each propagating wave is evaluated using the 2.5D acoustic boundary element method. This approach to sound radiation enables contributions from all the box girders to be included at a reasonable computational cost. The paper continues with a comparison in bridge vibration and noise between prediction and measurement for a typical site. And finally, based on the parameters of that site, characteristics of noise radiation from the concrete box girders are studied using the prediction model.

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