Curved Steel I-Girder Bridge Response during Construction Loading: Effects of Web Plumbness

Howell, T.D.; Earls, Christopher J.

doi:10.1061/(asce)1084-0702(2007)12:4(485)

Cited by 8 publications

(6 citation statements)

References 4 publications

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“…Comprehensive guidance on the quantification of the accuracy of various analysis methods is not yet available. But recent research is beginning to demonstrate that the effects of inaccurate deflection calculations or ignored deflection parameters can be significant (2,5,19,20).…”

Section: Influence Of Span Length Curvature and Skew On Construction Tolerances And Fit-up Span Lengthmentioning

confidence: 99%

Analysis of Steel Girder Bridges

Coletti¹,

Yadlosky²

2008

Transportation Research Record: Journal of the Transportation R

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As the design challenges faced by bridge engineers become more complex, the importance of properly analyzing steel girder bridges is increasing dramatically. Improper modeling of steel girder bridges can result in misleading analysis results, which can lead to constructability problems or, worse still, problems with structures in service. This paper broadly outlines the various methods of analysis and presents key modeling issues for consideration in steel girder bridge analysis. Some recent comparisons of modeling techniques demonstrate the variability in analysis results for identical bridges modeled in different ways.

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Section: Influence Of Span Length Curvature and Skew On Construction Tolerances And Fit-up Span Lengthmentioning

confidence: 99%

Analysis of Steel Girder Bridges

Coletti¹,

Yadlosky²

2008

Transportation Research Record: Journal of the Transportation R

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“…Additionally, providing shoring towers at span quarters and the use of lateral bracing in exterior girder spaces were proven to be effective means of reducing levels of deflection. Howell and Earls (2007) evaluated the effect of the web plumbness during the erection of the steel superstructure. Finite-element models were used to study the effect that the web out-of-plumbness has on flange tip stresses, vertical and lateral deflections, cross-sectional distortion and cross-frame demands.…”

Section: Constructibilitymentioning

confidence: 99%

Levels of lateral flange bending in straight, skewed and curved steel I -girder bridges during deck placement

Galindez¹

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Major-axis bending moment (Eqs. 1-1, 2-11) M + : Maximum moment in-between the cross-frame spacing (Grubb, 1991) M fw : Maximum fixed-end moment at the cross-frame locations (Grubb, 1991) M l : Lateral flange moment (Eq. 2-4) M lat : Lateral flange bending moment (Eq. 1-1) M nb : Maximum normal bending moment (Eq. 2-2) MPC: Multi-point constraint M u : Maximum moment capacity of the flange (Eq. 2-4) Mu: Factored major-axis bending M w : Maximum lateral moment in the bottom flange due to factored wind loading

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“…Unexpected displacements, stress conditions and girder instabilities can plague curved bridge erection. An example of this is the inherent behavior of a single curved girder to want to rotate and translate under self-weight due to its center of gravity not being coplanar with the web (Howell and Earls, 2007). Grubb et al (1996) discusses many issues relating to the fabrication, construction and erection of horizontally curved steel girder bridges.…”

Section: Construction Issuesmentioning

confidence: 99%

“…These detailing may be significant if bridge components must be forced into alignment, creating unaccounted for stress conditions in the girders and an out-of-plumb web. Further research is needed in order to determine the loss of bridge capacity due to girder webs being out-of-plumb (Howell and Earls, 2007). are more sensitive to out-of-plumbness than girders of larger radii.…”

Section: Construction Issuesmentioning

confidence: 99%

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Effect of Temperature Variation on the Structural Capacity of a Multi-Span Horizontally Curved Steel I-Girder Bridge

Beckett¹

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Horizontally curved steel I-girder bridges have become a popular bridge design choice among bridge engineers. The current level of knowledge regarding the design and analysis of curved I-girder bridges under thermal loading is incomplete. The thermal expansion of curved bridges is rather complicated and current standards provide little guidance when designing a bearing plan to prevent the development of thermal stresses and out-of-plane distortional behavior. Thermal stresses, in the form of axial compressive stresses, will develop if thermal expansion is constrained. This study examines the effect of different bearing arrangements on the development of thermal stresses and out-of-plane web distortions in a newly constructed bridge located in West Virginia. Three dimensional finite element modeling and analysis is performed in order to predict bridge response. The research shows that uniform thermal loading significantly increases the magnitude of out-ofplane web distortions. Finite element modeling also shows that very significant levels of thermal stress develop in the curved steel I-girders, consuming a considerable percentage of the bridge's total capacity. The web distortions and thermal stresses will result in major serviceability issues, shortening the life of the structure. However, this behavior is largely eliminated with the implementation of a new bearing arrangement, which removes the constraints from the original bearing plan.

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Curved Steel I-Girder Bridge Response during Construction Loading: Effects of Web Plumbness

Cited by 8 publications

References 4 publications

Analysis of Steel Girder Bridges

Analysis of Steel Girder Bridges

Levels of lateral flange bending in straight, skewed and curved steel I -girder bridges during deck placement

Effect of Temperature Variation on the Structural Capacity of a Multi-Span Horizontally Curved Steel I-Girder Bridge

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