Research on the Method of Prestressing Tendon Layout for Large-Span Prestressed Components Continuous Rigid Frame Bridge Based on “Zero Bending Moment Dead Load Theory”

Based on the theory of zero bending moment under constant load, various optimization methods exist for the top beam of large-span continuous rigid frame bridges. These include achieving zero bending moment at the root of the cantilever beam, at the control stage section, and through the zero deflect...

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Bibliographic Details
Published inBuildings (Basel) Vol. 14; no. 6; p. 1588
Main Authors Liu, Fanggang, Gu, Lixiong, Fu, Haishan, Li, Xinping, Zhao, Xiaolong, Ma, Niujing, Guo, Zhaolong
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.06.2024
Subjects
beam matching idea
Bending moments
Bridge loads
Bridges
Cantilever beams
Cantilever plates
Cantilevers
Concrete
constant load zero bending moment
Construction
Continuous bridges
Dead loads
Design optimization
Design specifications
finite element
Finite element method
Matching
Mechanical properties
Methods
Prestressed concrete
Prestressing
Static loads
Steel beams
Tendons
China
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Summary:Based on the theory of zero bending moment under constant load, various optimization methods exist for the top beam of large-span continuous rigid frame bridges. These include achieving zero bending moment at the root of the cantilever beam, at the control stage section, and through the zero deflection method. This study aims to explore the methods and effects of optimizing roof beam design using the constant load zero bending moment method and the “three group bundle method”. Using finite element modeling, the total number and eccentricity of prestressed tendons required for each suspended pouring block are determined. Additionally, the “three group beam matching method” is employed to adjust the steel beam, adhering to the design concept of “large cantilever beam matching and small cantilever beam matching”, to achieve a reasonable configuration of the top plate beam. Through specific engineering examples, the results demonstrate that utilizing the constant load zero moment method and the “three group bundle method” can significantly enhance the structural performance and economy of large-span continuous rigid frame bridges. Moreover, it offers practical operability, providing an important reference basis for similar project designs.
ISSN:2075-5309
2075-5309
DOI:10.3390/buildings14061588