scholarly journals Nonlinear Finite Element Modelling and Parametric Study of Prestressed Steel Box Girder

2021 ◽  
Author(s):  
Mahgoub Elhaj Mahgoub Kambal ◽  
Mohammed Awad ◽  
Malik Mohammed Ali
Keyword(s):  
Numerical Model ◽  
Mechanical Behavior ◽  
Parametric Study ◽  
Box Girder ◽  
Plate Girders ◽  
Force Magnitude ◽  
Prestressing Force ◽  
Steel Box Girder ◽  
External Tendons ◽  
Strengthening Technique

Abstract The prestressing technique is easy to apply and is generally used to strengthen steel bridges and controls their gross deflection. ANSYS has been used to establish a numerical model for the mechanical behavior of a steel box girder and prestressed by external tendons. In this paper, steel plate girders with and without strengthening technique was tested to assess the effectiveness of this technology. The results showed that prestressing improves the mechanical behavior of a girder and that its effect is proportional to magnitude of the applied external load. The results of the numerical model showed good agreement with the experimental data. A full-course simulation was conducted with ANSYS for a parametric study to analyze the influence of prestressing force magnitude, span-height ratio, and tendon configurations in increasing the effectiveness of prestressed technique.

scholarly journals Design optimization of two-span continuous composite box girder bridges

2021 ◽  
Author(s):  
Alp Ozten
Keyword(s):  
North America ◽  
Design Optimization ◽  
Design Criteria ◽  
Box Girder Bridges ◽  
Box Girder ◽  
Plate Girders ◽  
The Past ◽  
Girder Bridges ◽  
Steel Box Girder ◽  
Conventional Plate

Composite steel box girder bridges have become an effective alternative to conventional plate girders and concrete girder bridges in North America in the past 25 years. A number of ongoing innovations in Canada and elsewhere have the potential of further enhancing the design, durability, constructability, and, by extension, the economics of steel box-girder bridges. The thesis examines number of boxes actually needed, with the aim of reducing the number used at present while meeting all design criteria.

Parametric Study of the Intermediate External Bracing System of Composite Steel Box Girder Bridges

2021 ◽  
Vol 21 (1) ◽  
pp. 56-60
Author(s):  
Hawraa Sami Malik ◽  
David A. M. Jawad
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Parametric Study ◽  
Box Girder Bridges ◽  
Box Girder ◽  
Girder Bridges ◽  
Steel Box Girder ◽  
Good Ability ◽  
Bracing System ◽  
Concrete Deck

During the pouring of concrete deck, the installation of external bracing between the inner and outer girders may be necessary when the bridge has sharp curve in order to control the deflection and rotation of the girders. However, it is important to minimize the number of external bracing members, as they have expensive cost and they also have opposite effects for the fatigue features of the steel tub girders. The analysis of curved box girder bridges is carried out numerically by the use of finite element method through (ANSYS 19.2) software. The curved box girder with the intermediate external diaphragms was modeled and the analysis was carried out for many parameters like external bracing sections, girders with or without concrete deck, girders with end diaphragms or without them. The study concluded that ANSYS program has a good ability in evaluating the external bracing force comparing with code equations.

scholarly journals Theoretical and Experimental Study on Natural Frequency of Externally Prestressed Box-Girder with Corrugated Steel Webs

2016 ◽  
Vol 10 (1) ◽  
pp. 532-548 ◽  
Author(s):  
Baodong Liu ◽  
Rui Xu ◽  
Pengfei Li ◽  
Kai Mou ◽  
Jianbo Chen
Keyword(s):  
Natural Frequency ◽  
Dynamic Test ◽  
Effective Cross Section ◽  
Longitudinal Direction ◽  
Maximum Error ◽  
Box Girders ◽  
Box Girder ◽  
Prestressing Force ◽  
Composite Girder ◽  
External Tendons

Based on the characteristics of box girder with corrugated steel webs, the existing prestressing force, the effect of shear deformation of composite girder on the deflection, “folding effect” in longitudinal direction of corrugate steel webs and the arrangement of external tendons were considered comprehensively. With the experiment results of five literatures integrated,N/fcA(the axial compression ratio) was selected as regression parameter to develop a regression equation for the effective cross-section stiffness of the girder. Then a formula for natural frequency of the externally prestressed box girder with corrugated steel webs was proposed. Finally, thein-situmeasurement on an actual bridge and a laboratory dynamic test on the model box girder with seven prestressing levels were conducted. The test results showed that the natural frequency of box girders with corrugated steel webs increased along with the growing external force. In contrast to other related formulas, the calculated results of the formula proposed in this paper showed the same tendency with measured results and the maximum error is 1%.

scholarly journals Design optimization of two-span continuous composite box girder bridges

2021 ◽  
Author(s):  
Alp Ozten
Keyword(s):  
North America ◽  
Design Optimization ◽  
Design Criteria ◽  
Box Girder Bridges ◽  
Box Girder ◽  
Plate Girders ◽  
The Past ◽  
Girder Bridges ◽  
Steel Box Girder ◽  
Conventional Plate

Composite steel box girder bridges have become an effective alternative to conventional plate girders and concrete girder bridges in North America in the past 25 years. A number of ongoing innovations in Canada and elsewhere have the potential of further enhancing the design, durability, constructability, and, by extension, the economics of steel box-girder bridges. The thesis examines number of boxes actually needed, with the aim of reducing the number used at present while meeting all design criteria.

Patch load resistance of longitudinally stiffened steel plate girders: A parametric study

ce/papers ◽  
2021 ◽  
Vol 4 (2-4) ◽  
pp. 2107-2114
Author(s):  
Sasa Kovacevic ◽  
Aleksandar Ceranic ◽  
Nenad Markovic
Keyword(s):  
Parametric Study ◽  
Steel Plate ◽  
Load Resistance ◽  
Plate Girders ◽  
Patch Load ◽  
Stiffened Steel

Design of the Murray and Wolverine River rail bridges

1984 ◽  
Vol 11 (4) ◽  
pp. 701-708 ◽  
Author(s):  
G. W. Taylor
Keyword(s):  
Single Cell ◽  
Key Words ◽  
Continuous Steel ◽  
Box Girder ◽  
Railway Bridges ◽  
Branch Line ◽  
Steel Box Girder ◽  
Deck Plate ◽  
Bridge Steel

This paper describes the design of the Murray and Wolverine River rail bridges, two of the largest river crossings on British Columbia's Tumbler Ridge branch line. These unique railway bridges feature a single-cell, continuous steel box girder superstructure supported by pairs of steel delta legs. The top flange of the box girder is an orthotropic deck plate that is a part of the ballast containment trough. Stability of the delta legs is provided by posttensioning of their bases to the concrete substructure. Key words: rail bridge, steel box girder, steel delta legs, orthotropic deck, posttensioning.

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