Bending behaviors of quasi-closed trapezoidal box girders with X-type internal cross-frames

Kim, Kyungsik; Yoo, Chai H.

doi:10.1016/j.jcsr.2009.04.014

Cited by 7 publications

(4 citation statements)

References 5 publications

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“…K-frames or Xframes were chosen as internal steel frames to use in quasi-closed trapezonidal box girders and mainly to improve the torsional and distortional resistance. Matrix equations of brace forces were proposed and combined with finite element model, and confirmed the validity of the proposed equations (Kim and Yoo, 2009).…”

Section: Introductionmentioning

confidence: 62%

Adding composite truss to improve mechanical properties of reinforced concrete T-girder bridge

Yang

Hou

et al. 2022

Advances in Structural Engineering

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To solve the problem of insufficient transverse connection of T-girder bridges, this paper investigated the strengthening method of two composite trusses symmetrically installed in mid-span. The composite truss included two top plates, four diagonal braces, and one horizontal brace. An experimental investigation was carried out to study the mechanical properties of reinforced concrete T-girder using single-point loading method under four load cases. The experimental results showed that the maximum transverse stiffness of T-girder specimens strengthened with composite trusses improved by 12.4% compared with control beams. Simultaneously, it had an excellent restraining effect on the cracks development. The maximum percentage decrease in the deflection corresponding to the maximum load when the reinforced concrete T-girder strengthened with composite trusses over the control beam of up to 39.7 was observed. In addition, the load transverse distribution coefficient was investigated according to rigid-jointed slab (girder) method. The composite trusses were chosen as intermediate diaphragm to calculate moment of inertia. The analytical model was in an accurate with the experimental result under the same loading condition. The optimize spacing of composite trusses was given from 600 mm ( L/10) to 1200 mm ( L/5), and thickness of top plate was 30 mm when the load transverse distribution coefficient was homogeneously distributed. Finally, a three-dimensional finite element model was used to evaluate the effectiveness of composite trusses.

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Section: Introductionmentioning

confidence: 62%

Adding composite truss to improve mechanical properties of reinforced concrete T-girder bridge

Yang

Hou

et al. 2022

Advances in Structural Engineering

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“…As demonstrated by Kim and Yoo [22,23], the cross-frame spacing cannot be determined by distortional stress level alone in the case of horizontally curved tub girders. The spacing has a major implication to the design of top lateral bracing members, which may require a heavy section if an unfavorable deck casting sequence is considered.…”

Section: Distortional Stressesmentioning

confidence: 99%

“…In this analysis, a single angle, L178 Â 100 Â 13 (L7 Â 4 Â 1/2) having an area of 3.28125EÀ03 m 2 (5.25 in 2 ) is used for the diagonals of the Kframes. The diagonals are locked in the initial stress as outlined in recent publications (Kim and Yoo [22,23]) under the dead load, and additional stresses are added following the distortional action under dead load, superimposed dead load, and vehicular live load.…”

Section: Distortional Stressesmentioning

confidence: 99%

Stresses due to distortion on horizontally curved tub-girders

Yoo

Kang

Kim

2015

Engineering Structures

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“…The finite element simulation or experiment was just done, and there was no theory. The shearing strain energy and shearing stiffness of the diaphragms and side walls of double T-bridge and single cell box girder were investigated in the individual papers [15][16][17]. However, the shear strain energy caused by the horizontal distortion angle was only calculated about the diaphragms of single cell box girder, and the shear strain energy caused by the vertical distortion angle was ignored in that study.…”

Section: Introductionmentioning

confidence: 99%

Transverse Shearing Strain Energy Calculation of Single Cell Box Girder

Zhao

Wei

2010

AMR

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Both the increasingly-thin walls of box girder cross-sections and the super-loads from trains or track vehicles make the behavior research on diaphragms and side walls become particularly important. According to the deformation of single cell box girder cross-section, the displacement parameters were designed, and the displacement modes of cross-section distortion angles were deduced. The schematic plans of diaphragms and side walls were simulated by rigid frames or plates. Both the shearing strain energy and the shearing stiffness of diaphragms and side walls were deduced on the basis of the principles of mechanics and finite element. The results show that the shearing strain energy increases with the displacement by a power function. And the method calculation results are close to the commercial FE software calculation results, which show that the calculation method of single cell box girder presented in this paper is correct and reliable. The calculation method is simpler than the commercial FE software calculation method. In the calculation method, whether diaphragms and side walls are calculated separately or calculated as some parts of the box girder or the vehicle - bridge system, the calculation precision of diaphragms and side walls remains unchanged.

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Bending behaviors of quasi-closed trapezoidal box girders with X-type internal cross-frames

Cited by 7 publications

References 5 publications

Adding composite truss to improve mechanical properties of reinforced concrete T-girder bridge

Adding composite truss to improve mechanical properties of reinforced concrete T-girder bridge

Stresses due to distortion on horizontally curved tub-girders

Transverse Shearing Strain Energy Calculation of Single Cell Box Girder

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