Shear Lag Effect Study of a Composite Girder Cable-Stayed Bridge During Construction

She, Q. C.; Chen, C. S.; Yan, D. H.; Wu, L. M.; Huang, G.

doi:10.2507/ijsimm21-4-615

Cited by 2 publications

(1 citation statement)

References 19 publications

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“…Cable-stayed bridges are widely used because of their attractive shapes and strong spanning abilities [1,2]. Statistics show that cable-stayed bridges built in China now account for 35% of the total number of cable-stayed bridges in the world [3].…”

Section: Introductionmentioning

confidence: 99%

Cable Replacement Scheme for Low Tower Cable-Stayed Bridges Based on Sensitivity Analysis

2023

Teh. vjesn.

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Cable replacement is a key technique to solve the problems of cable corrosion and strand breakage. Cable removal causes structural changes. The choice of replacement method affects the safety of the bridge during cable replacement. A sensitivity analysis method was used to evaluate the force and deflection changes of Wohu Bridge. A reasonable method for the number and order of cable replacement was proposed; by comparing different cable removal schemes, it was revealed that the cable force and beam stress changes of the cables closest to the removed cable were the most significant. The results showed that the cable force increment of the surrounding cables was the largest when removing the longest cable. The structural impact change was small when removing the shortest cable. The maximum deflection at the top of the tower decreased with the decrease of the length of the removed cable. It was recommended to replace two cables symmetrically from the center of the tower, and the optimal replacement order was from the shortest cable to the longest cable. Furthermore, this paper also studied the influence of variable load on the cable replacement scheme, and demonstrated that the design scheme of opening part of traffic in this paper was safe and feasible.

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Section: Introductionmentioning

confidence: 99%

Cable Replacement Scheme for Low Tower Cable-Stayed Bridges Based on Sensitivity Analysis

2023

Teh. vjesn.

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Experimental and theoretical investigation of shear lag effect in twin box‐shaped composite girders of long‐span cable‐stayed bridges

She,

Yan,

Chen

et al. 2024

Structural Concrete

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Steel‐concrete composite box girders offer notable advantages such as high stiffness, excellent torsional performance, and light self‐weight, making them prevalent in large‐span bridges, particularly in cable‐stayed configurations. However, a persistent challenge arises from the shear lag effect in the concrete slab within the flanges induced by shearing interactions between the webs and flanges. Limited attention has been devoted to investigating the experimental and theoretical aspects of shear lag in long‐span cable‐stayed bridges with twin box‐shaped composite girders. This research addresses this gap by designing a segmental scale twin box‐shaped composite model specimen to simulate the cable spacing of the main girder in a cable‐stayed bridge, specifically targeting the shear‐lag effect. The study successfully captures the non‐uniform distribution of cross‐sectional strain in the top concrete slab. Subsequently, analytical strain solutions for the composite girder under mid‐span concentrated load and axial load are derived using the energy variation method. The theoretical model's applicability is then calibrated against experimental results. The investigation extends to the in‐situ testing of the Chibi Yangtze River Bridge, the world's largest steel‐concrete composite girder cable‐stayed bridge, boasting a main span of up to 720 m. An established finite element (FE) analysis model for the Chibi Yangtze River Bridge simulates the transverse stress distribution under typical construction conditions of CC6. Comparative analyses between the simulated results, calculated values from elementary beam theory, and the theoretical model against field‐measured values reveal that the FE model provides a more accurate estimation of the shear lag effect in the concrete slab. Notably, the FE model effectively reflects the bridge's characteristics and serves as a baseline for subsequent studies. This comprehensive investigation contributes significantly to the understanding and analysis of shear lag phenomena in twin box composite girders of cable‐stayed bridges. The integration of experimental, analytical, and construction site validations establishes robust tools for engineering design and the construction of safe and serviceable cable‐stayed bridges. The research augments knowledge regarding shear lag behavior and underscores the necessity to appropriately consider its effects in bridge analysis and design.

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Shear Lag Effect Study of a Composite Girder Cable-Stayed Bridge During Construction

Cited by 2 publications

References 19 publications

Cable Replacement Scheme for Low Tower Cable-Stayed Bridges Based on Sensitivity Analysis

Cable Replacement Scheme for Low Tower Cable-Stayed Bridges Based on Sensitivity Analysis

Experimental and theoretical investigation of shear lag effect in twin box‐shaped composite girders of long‐span cable‐stayed bridges

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