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Abstract

As China's construction industry experiences booming development and the demand for transportation is increasing, continuous rigid frame bridges have become the main structural system for large-span bridges due to their advantages of avoiding system transformation, reducing deck expansion joints, and providing comfortable driving. However, due to the characteristics of their rigid frame systems and the shrinkage and creep properties of concrete materials, continuous rigid frame bridges are sensitive to changes in environmental temperature and humidity, which can even severely result in engineering diseases such as cracks and large deformation in the bridge, causing decreased driving comfort and safety hazards. By taking the the Yarlung Zangbo River Bridge as the engineering background, this paper studied the influence of temperature and humidity on the stress of continuous rigid frame bridges in plateau environment by finite element calculation. The calculation results show that temperature changes in plateau environments significantly affect the stress of rigid frame bridges. Temperature gradient changes can easily cause uneven structural stress distribution, while overall temperature changes significantly affect the displacement of rigid frame bridges. Additionally, the influence of humidity in plateau environments on bridge structures is mainly reflected in the deflection displacement at the central span, and the deflection displacement of continuous rigid frame bridges increases significantly in low-humidity environments.

Publication Date

1-18-2024

DOI

10.14048/j.issn.1671-2579.2023.06.027

First Page

171

Last Page

176

Submission Date

March 2025

Reference

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