An analysis of long time deflection of long span prestressed concrete bridges

Vráblík, Lukáš; Kř́ıstek, Vladiḿır

doi:10.1201/b10430-212

Cited by 2 publications

(2 citation statements)

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“…Effective reduction in deflection relies significantly on reasonable reinforcement arrangement and high construction quality. This reduction can be achieved through optimized design reinforcement, enhanced reinforcement in the compression zone, and the utilization of low-creep concrete [12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

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”

Liu,

Gu,

et al. 2024

Buildings

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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.

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Section: Introductionmentioning

confidence: 99%

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”

Liu,

Gu,

et al. 2024

Buildings

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“…Dynamic behavior has attracted more attention for bridges with large span lengths. 5 Due to the higher serviceability limits compared to conventional railway bridge design, the technical issues associated with the dynamic response of high-speed railway bridges have been investigated in many previous studies, such as seismic performance, [6][7][8][9][10] track structure, interaction, 11,12 creep effect, 13,14 and thermal effect. 15 However, few investigations have focused on the effect of the impact factor by comparing with and further verifying the design codes.…”

Section: Introductionmentioning

confidence: 99%

Structural behavior analysis of a continuous steel truss arch railway bridge integrating monitoring data

Song

Zhao

Gao-xin

et al. 2017

Advances in Mechanical Engineering

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Using theoretical modeling combined with monitoring data, the typical dynamic and static behaviors of a continuous steel truss arch railway bridge are evaluated. The dynamic behavior involves an impact factor induced by the action of running trains, and the static behavior refers to axial bending performance and the stress distribution among different planes of the truss. The transverse position, length, and speed of running trains are introduced to conduct an analysis of their influences on the dynamic and static behaviors of the bridge superstructure. A structural safety evaluation is also conducted by comparison with the provisions recommended by design codes and by analysis of absolute stress. It is concluded that three types of members present different dynamic behaviors and that the value of the impact factor for chords B exceeds the provision recommended by the design codes. Chords C present the greatest ratio of bending stress versus axial stress. An imbalance of stress distribution exists among the three planes of the truss, and the difference is the smallest when trains run along the middle railways. Because the train-induced stress is considerably lower, the dynamic and static performances of the bridge are within the scope of safety.

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An analysis of long time deflection of long span prestressed concrete bridges

Cited by 2 publications

References 0 publications

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”

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”

Structural behavior analysis of a continuous steel truss arch railway bridge integrating monitoring data

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