Construction alignment and closure control of CFST truss arch bridges based on temperature effect

Hu, Wei; Liu, Jiang; Liu, Yongjian; Lyu, Yi; Li, Haotian; Xian, Jianping; Ma, Yinping

doi:10.1016/j.istruc.2024.106471

Cited by 2 publications

(1 citation statement)

References 16 publications

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“…As a result, the temperature of the shaded area decreases significantly [14], leading to a reduced temperature gradient in the pylon column. This reduced temperature gradient can reduce the bending deformation, causing the deformation of the two sides of the pylon columns to be unsynchronized, which will further increase the difficulty of the construction control [15,16].…”

Section: Introductionmentioning

confidence: 99%

Finite-Element Analysis of Temperature Field and Effect on Steel-Concrete Composite Pylon of Cable-Stayed Bridge without Backstays

Gong,

Feng,

Liu

et al. 2024

Buildings

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The backless cable-stayed bridge has the advantages of beautiful shape and reasonable force, but due to the low overall stiffness of the bridge pylon during cantilever construction, it is susceptible to the effect of solar temperature. To reveal the temperature deformation laws and achieve accurate alignment prediction during the installation process of steel–concrete composite pylons in complex environments, a refined numerical simulation model for the 3D bridge temperature field was established based on the proposed automatic sunshine-shadow recognition method. Subsequently, the optimal time periods for construction control are provided. The results of the study show that, during the cantilever construction of the bridge pylon, one pylon column will shade the other pylon column, resulting in asynchronous deformation that can reach 7.6 mm. The effect of solar temperature on the displacement of the bridge pylon is significant, where the maximum daily change in transverse displacement in the cantilevered state of the pylon can reach 33.6 mm, and the maximum change in cable force value can reach 52 kN. In order to mitigate the effect of solar radiation, the best construction time for the bridge pylon is 19:30~9:30, while the tensioning and measurement of the cable should be avoided from 6:00~18:00. This strategy ensures that the control of the pylon top displacement is maintained within 1/4000 of the pylon height, and the error in cable force is kept within 5%.

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Section: Introductionmentioning

confidence: 99%

Finite-Element Analysis of Temperature Field and Effect on Steel-Concrete Composite Pylon of Cable-Stayed Bridge without Backstays

Gong,

Feng,

Liu

et al. 2024

Buildings

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Experimental and statistical investigation on temperature gradient of CFST truss chords

Yan,

Liu,

Liu

et al. 2024

Advances in Structural Engineering

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Due to mutual shading occlusion among staggered components, the solar temperature fields of CFST truss are complex, and the temperature actions of the truss chords differ from that of single-tube members, posing challenges in the calculation and assessment of thermal effects. This study proposed a temperature action mode tailored to independent thermal effects of CFST truss. Experimental testing over 1 year was conducted on a CFST truss specimen, with temperature gradients of chords analyzed using an extreme value statistical method and various machine learning algorithms. Structural parameters affecting temperature gradients were also examined through numerical simulation. The findings were applied to assess thermal responses in a real bridge scenario. Significant differences in the temperature gradients were observed between upper and lower chords, with the upper chords showing larger vertical temperature difference and the lower chords exhibiting slightly larger lateral temperature difference. A linear relationship in the temperature actions across different chords was notable. Bending effects induced by temperature gradients in chords may equal or surpass those caused by vehicle loads, necessitating careful consideration in CFST bridge design. The proposed extreme value statistical method for bridge temperatures, based on fourth-order linear moments, effectively determined optimal thresholds and probability distributions, demonstrating excellent performance when applied to tested data. Advanced machine leaning-based predictive models for bridge temperatures offer enhanced flexibility and accuracy compared to traditional predictive formulas.

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Construction alignment and closure control of CFST truss arch bridges based on temperature effect

Cited by 2 publications

References 16 publications

Finite-Element Analysis of Temperature Field and Effect on Steel-Concrete Composite Pylon of Cable-Stayed Bridge without Backstays

Finite-Element Analysis of Temperature Field and Effect on Steel-Concrete Composite Pylon of Cable-Stayed Bridge without Backstays

Experimental and statistical investigation on temperature gradient of CFST truss chords

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