Temperature gradient zoning of steel beams without paving layers in China

Guo, Fengqi; Zhang, Sanhong; Duan, Shuyi; Shen, Zhaolong; Jiang, Lizhong; He, Chang

doi:10.1016/j.cscm.2023.e02054

Cited by 2 publications

(1 citation statement)

References 13 publications

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“…Ding et al [11] utilized extreme value theory to analyze ten years of temperature monitoring data for the Runyang Bridge, and found that the estimated extreme values of vertical temperature differences were in excellent agreement with the UK code. Guo et al [12] analyzed in situ measurements of unpaved steel box girders and investigated the status of temperature gradient partitioning research in China [13]. It is evident that the four-segment model in the UK BS-5400 code provides a superior description of the vertical nonlinear temperature distribution pattern in steel box girders compared to other code.…”

Section: Introductionmentioning

confidence: 99%

Refined Analysis of Spatial Three-Curved Steel Box Girder Bridge and Temperature Stress Prediction Based on WOA-BPNN

Hu,

Zhang,

Shi

et al. 2024

Buildings

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Bridges often improve the visual appeal of urban landscapes by incorporating curve elements to create iconic forms. However, it is noteworthy that curved bridges have unique mechanical properties under loads compared to straight bridges. This study analyzes a spatial three-curved steel box girder bridge based on an actual engineering case with a complex configuration. Initially, the finite element software Midas/Civil 2021 is utilized to establish a beam element model and a plate element model to examine the structural responses under dead loads in detail. Then, two different temperature gradient distribution models are employed for the temperature effect analysis. The backpropagation neural network (BPNN) optimized by the WOA algorithm is trained as a surrogate model for finite element models based on the results of temperature stress simulation. The results reveal that the bending–torsion coupling effect in the second span of the spatial three-curved steel box girder bridge is pronounced, with the maximum torque reaching 40% of the bending moment. The uneven distribution of cross-section stress is particularly significant at the vertices, where the shear lag coefficient exceeds 3. Under the action of temperature gradients, the bridge displays a warped stress state; the stress results obtained from the exponential model exhibit a 21% increase compared to BS-5400. Optimization of the weights by the WOA algorithm results in a significant improvement in prediction accuracy, and the convergence speed is improved by 30%. The coefficient of determination (R2) for predicting temperature stress can reach as high as 0.99.

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Section: Introductionmentioning

confidence: 99%