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Abstract

In order to solve the two major problems of mid-span deflection and cracking in the late stage of the long-span bridge, a UHPC-NC hybrid beam design scheme was proposed, and some design parameters were optimized based on the response surface method. By optimizing the local parameters, namely the thickness of the roof, web, and bottom plates of the mid-span section, and the overall parameters, such as the UHPC replacement ratio, the number of beam curves, and the height of the mid-span beam, the optimal parameter combination was obtained as follows: roof thickness of 22 cm, web plate thickness of 25 cm, bottom plate thickness of 32 cm, UHPC replacement ratio of 0.63, curve times of 1.8, and height of the mid-span beam of 3.35 m. Then, the finite element model was established based on the optimal parameter combination and compared with the original design model. The results show that the top bending moment of each pier is reduced by more than 12%; the bending strain energy of the whole bridge is reduced by 34.7%; the stress of the upper and lower edges of each key section is generally reduced by 12%, and the maximum deflection is reduced by 23.3%.

Publication Date

7-14-2023

DOI

10.14048/j.issn.1671-2579.2023.03.011

First Page

76

Last Page

82

Submission Date

March 2025

Reference

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