Experimental Study on Magnesium Sulfate Cement Concrete Splices of Widened Box Girder

Zhang, Lifang; Yan, Jin; Ma, Hongfang; Yu, Hongfa; Wang, Ying; Mei, Qiquan

doi:10.1007/s12205-021-1963-z

Cited by 3 publications

(1 citation statement)

References 25 publications

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“…To mitigate the adverse effect because of the different completion times of the new and existing bridges, the method of delayed splicing of the new and existing bridges for a period of six months is usually adopted worldwide to reduce the adverse effects of differences in deformation between the new and existing bridges on the widened structure [ 8 , 9 , 10 ]. However, for the widened structures of multi-span long-unit bridges, a delay of six months alone does not fundamentally solve the problem [ 11 ]. Shi et al [ 7 ] analyzed the effects of long-term loads on the mechanical performance of three widened long-unit prestressed concrete girder bridges.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis on Transverse Splicing Structure for the Widening of a Long Multi-Span Highway Concrete Continuous Box Girder Bridge

Zhang

Liu

et al. 2022

Materials

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For the bridge widening of long multi-span highway concrete continuous box girder with a conventional splicing structure, due to the large longitudinal difference deformation by concrete shrinkage and creep between the existing and new ones, the widened structure will have an overlarge bending deformation after widening, especially an obvious transverse deformation at the end of girder, which will lead to structural damage to the newly widened structure. To effectively absorb the difference deformation mentioned above, this study proposes a novel transverse splicing structure based on the folding effect of a corrugated steel plate (CSP) (hereinafter referred to as “the CSP splicing structure”). Then, a finite element structural analysis was performed on the mechanical properties of the widened structure with the CSP splicing structure, and compared to those of a widened structure adopting the conventional concrete splicing mode, to clarify the transverse load transferring mechanism of the structure. Finally, by conducting a sensitivity analysis on CSP thickness, corrugation length, splicing stitch width, and other structural parameters, a sound parameter combination scheme was put forward. According to the research results, to ensure effective utilization of the CSP folding effect, the corrugation pattern direction of CSP should be set as horizontal, and the wave angle as the degree of 90°. In addition, it mitigated the transverse tensile stress to effectively avoid concrete cracking feasibility on the top flange of the box girder at the end of the girder. This study offers a feasible way of avoiding the structural damage produced by an excess transverse deformation at the end of the girder after bridge widening of a long multi-span concrete continuous box girder.

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Section: Introductionmentioning

confidence: 99%

Numerical Analysis on Transverse Splicing Structure for the Widening of a Long Multi-Span Highway Concrete Continuous Box Girder Bridge

Zhang

Liu

et al. 2022

Materials

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Effects of early vibration and resistant strategies on bond performances between high-strength concrete and rebar

Li,

Yang,

Zhao

et al. 2023

Structures

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A Multi-Technique Hybrid Method for the Widening and Splicing of New and Old Beam Bridges

Tan,

Yu,

Zhang

2024

Sustainability

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With the rapid increase in the urban traffic volume, the traffic capacity of existing bridges could not meet the demands of urban planning in many cities, leading to the problem of reconstruction or expansion. Considering the sustainability principle in bridge structure construction while minimizing the environmental implications of the construction activities, a multi-technique hybrid method for the widening and splicing of new and old beam bridges was proposed. Firstly, according to the stress equations of the splicing interface between the new and old bridges, the control condition for the selection of the splicing materials was found, and a selection method based on the maximum stress at the splicing interface of the materials was proposed. Then, based on the control condition of the foundation settlement of the new bridges, the geometric parameters of the splicing structures, and the mechanical parameters of the splicing materials, equations for the minimum reinforcement ratio were derived according to the allowable stress value of the splicing materials. Lastly, the equivalent analogic orthotropic plate model of the splicing bridges was built, and based on that, a calculation method for the quantity of the splicing diaphragms was proposed. Also, the effectiveness of the proposed method was validated through a reconstruction and expansion project in Guangdong Province. The results showed that the maximum foundation settlements of the new bridges were smaller than the assumption values of the calculation after reconstruction of the old bridges, and no observable cracks were found in the splicing structures. The proposed method could serve as a reference for similar structure designs.

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Experimental Study on Magnesium Sulfate Cement Concrete Splices of Widened Box Girder

Cited by 3 publications

References 25 publications

Numerical Analysis on Transverse Splicing Structure for the Widening of a Long Multi-Span Highway Concrete Continuous Box Girder Bridge

Numerical Analysis on Transverse Splicing Structure for the Widening of a Long Multi-Span Highway Concrete Continuous Box Girder Bridge

Effects of early vibration and resistant strategies on bond performances between high-strength concrete and rebar

A Multi-Technique Hybrid Method for the Widening and Splicing of New and Old Beam Bridges

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