Comparison of detailing methods for straight skewed steel I-girder bridges

Gull, Jawad H; Azizinamini, Atorod; Helwig, Todd A.

doi:10.1016/j.jcsr.2017.05.003

Cited by 5 publications

(4 citation statements)

References 2 publications

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“…Recent study has shown that the lack-of-fit effects for the TDL fit detailing method at the SDL stage are equal and opposite to the lack-of-fit effects for the SDL fit detailing method at the TDL stage (Gull et al, 2017;Gull, 2014). Lack-of-fit effects for the SDL fit detailing method at the TDL stage can be obtained from grid analysis and reversing their sign shall give the lack-of-fit effects for the TDL fit detailing method at the SDL stage.…”

Section: Reversing 2d Ga Results For the Sdl Fitmentioning

confidence: 99%

“…It is worth noting that Δ is obtained from the concrete dead load camber calculated from deflection of the system of girders and cross-frames attached together in NCHRP 725 (White et al, 2012). This is an incorrect way of calculating Δ for the TDL fit detailing method at the SDL stage as explained elsewhere (Gull et al, 2017;Gull, 2014).…”

Section: Comparison Of Different Methods Of Analysismentioning

confidence: 99%

“…This is because the cross-frames are holding the girders into the twisted positions or are responsible for the lack-of-fit. Recent research (Gull et al, 2017;Gull 2014) has shown that cross-frame forces for the TDL fit detailing method are equal and opposite to the cross-frame forces at the TDL stage for the SDL fit detailing method. Therefore, cross-frame forces for the TDL fit detailing method at the SDL stage can be obtained by reversing the sign of the cross-frame forces for the SDL fit detailing method at the TDL stage.…”

Section: Cross-frame Forces Methodsmentioning

confidence: 99%

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Steel Structures Research Update: Advances in Design with Hollow Structural Steel Members

Liu

2019

Eng J

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Recent advances in design of steel-frame systems with hollow structural steel (HSS) members are highlighted. The featured work includes new and updated design guides that are co-authored by Jeffrey Packer and Jason McCormick. Dr. Packer’s experimental, numerical, and analytical research informs the design of HSS for various loading conditions, with a bias toward code/specification-related issues and guidance for practicing engineers. Dr. McCormick’s research on HSS members and connections ranges from research on steel HSS-based seismic moment frames to the use of innovative materials (e.g., polymer foam) to control the structural response of HSS members under seismic and wind loads. Selected studies are featured along with a preview of the new design guides. Research on HSS columns under axial and lateral loads fills knowledge gaps in seismic behavior and design. Foam-filled brace and bending member experiments show improved seismic performance with a light-weight polyurethane fill. Field tests, laboratory experiments, and numerical modeling are used to study behavior and develop design methods for hollow and concrete-filled HSS subject to blast and impact loading. Research on single-sided fillet welds of HSS members leads to improved design recommendations. Improved design procedures are also recommended based on research on HSS connections that are in branch compression, near chord ends, or offset laterally.

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Section: Reversing 2d Ga Results For the Sdl Fitmentioning

confidence: 99%

Section: Comparison Of Different Methods Of Analysismentioning

confidence: 99%

Section: Cross-frame Forces Methodsmentioning

confidence: 99%

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Steel Structures Research Update: Advances in Design with Hollow Structural Steel Members

Liu

2019

Eng J

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“…The literature on the interaction of component beams in grillages or similar structures (e.g., system of beams braced against torsion) focuses on, among others, (1) lateral torsional buckling of I-girders discretely braced against torsion and/or against translation [ 14 , 15 , 16 , 17 , 18 , 19 ], including lateral torsional buckling of beams with point bracing [ 20 , 21 ], (2) the numerical analysis of two- and four-beam structural systems transversely braced with coupling beams [ 22 ], (3) the assembly of beam systems in skewed bridge structures [ 23 ], (4) global stability loss in two-beam systems (beams connected by cross-frames) [ 24 , 25 ], (5) modelling of curvilinear composite bridges, in which the grillage structure made of full-wall I-beam girders was approximated by an equivalent 3D truss model [ 26 ], (6) taking into account, in the global analysis, the actual stiffness of the component beam joints (stringer-to-crossbeam) of the deck members of old railway bridges [ 27 ]. A considerable number of studies are available in the technical literature that deal with various grillage systems.…”

Section: Introductionmentioning

confidence: 99%

Elastic Critical Resistance of the Simple Beam Grillage Resulting from the Lateral Torsional Buckling Condition: FEM Modelling and Analytical Considerations

2023

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Transversely loaded beam grillages are quite often used in industrial construction. In order to produce a safe design of such structures, it is necessary to account for the lateral torsional buckling phenomenon, which reduces load-bearing capacity. To be able to calculate the relevant reduction factor, the elastic critical load must be determined. As regards the existing design practice for such structures, simplified conditions are assumed for the mutual restraint of the component beams. However, this approach does not correspond to reality. This study discusses the results of numerical investigations and analytical calculations concerning the effect of the elastic action of simple beam grillage (SBG) joints on the critical load, which results from the lateral torsional buckling (LTB) condition. The SBG was defined as a flat system of interconnected beams, unstiffened laterally and loaded perpendicularly to the grillage plane. The analysis covered H-shaped grillages with different span ratios of component beams, in which the main (coupling) beam was decisive for instability. The effectiveness of the use of closed-section stiffeners at the grillage joints was also investigated. The grillage elastic critical resistances (ECR) were determined for two variants of joint stiffening. The computations were performed by means of FEM numerical simulations. The spatial models were discretised with the following elements: (1) solid ones in Abaqus, (2) shell ones in ConSteel, and (3) thin-walled bars in ConSteel. The LTB critical moments of the weakest beam (critical beam), elastically restrained against warping and against lateral rotation (in the LTB plane), were computed using the analytical methods developed by the authors. To this end, the methods were proposed to determine the indexes of the critical beam elastic restraint in the adjacent stiffening beams. In the study, it was demonstrated that (1) taking into account the conditions of mutual elastic restraint and interaction of the component beams provides a more accurate assessment of the grillage ECR, (2) the use of closed-section stiffeners in the grillage joints increase the ECR compared with classic flat stiffeners, (3) the grillage ECR can be estimated based on the critical moment Mcr of the weakest beam (critical beam) when the conditions of its elastic restraint in joints are accounted for.

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Study of Simply Supported Skew Composite Bridge Decks Under IRC Loading

Regita,

Sofi

2022

Structural Integrity

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Comparison of detailing methods for straight skewed steel I-girder bridges

Cited by 5 publications

References 2 publications

Steel Structures Research Update: Advances in Design with Hollow Structural Steel Members

Steel Structures Research Update: Advances in Design with Hollow Structural Steel Members

Elastic Critical Resistance of the Simple Beam Grillage Resulting from the Lateral Torsional Buckling Condition: FEM Modelling and Analytical Considerations

Study of Simply Supported Skew Composite Bridge Decks Under IRC Loading

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