Influence of Skewed Diaphragms on the Mechanical Behavior of Girder Bridges Constructed Using a Staged Simply-Supported-to-Continuous Method
Journal Title: GeoStruct Innovations - Year 2024, Vol 2, Issue 4
Abstract
Prestressed concrete continuous box girder bridges have been widely adopted in transportation engineering due to their superior crack resistance (Kf ≥ 1.15) and stiffness stability (η ≤ 0.85). To address the mechanical uncertainties introduced by non-orthogonal diaphragm arrangements, by taking a 3 × 35 m box girder bridge constructed using a staged simply-supported-to-continuous method as the object, detailed beam grillage models with both orthogonal and stepped diaphragms were developed using Midas Civil 2023. Four loading scenarios were defined based on the JTG 3362-2018 standard, and static load tests employing four tri-axle heavy trucks were conducted to validate the model reliability. A total of 36 strain gauges (sampling frequency: 10 Hz) and 12 laser deflectometers (accuracy: ±0.01 mm) were installed on the top and bottom slabs of the box girder, with loading efficiency controlled within 0.91–1.03. Comparative analyses of strain fields (ε), deflections (δ), and shear lag effects were performed for both diaphragm configurations. The results demonstrated that, under maximum positive bending moment conditions, the longitudinal strain differential rate across the top slab for the stepped diaphragm configuration remained within 3.7%. The deviation in deflection at the support region under negative bending moments was Δδ = 1.2 mm, meeting the specified code limits (L/600 = 58.3 mm). The loading efficiency test (0.91–1.03) confirmed the equivalent load-bearing performance of the stepped diaphragm configuration, with the cracking safety factor (Kf = 1.18∼1.22) found to be consistent with that of the orthogonal diaphragm model. A diaphragm inclination–stiffness matching criterion was proposed in this study, offering a theoretical reference for the design of the girder bridges constructed using a staged simply-supported-to-continuous method.
Authors and Affiliations
Youguang Li, Yifeng Zheng, Wen Qiu
Keywords
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- EP ID EP765171
- DOI https://doi.org/10.56578/gsi020403
- Views 19
- Downloads 0
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