Journal of Jilin University(Engineering and Technology Edition) ›› 2022, Vol. 52 ›› Issue (8): 1808-1816.doi: 10.13229/j.cnki.jdxbgxb20210197

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Wheel⁃load diffusion effect on orthotropic steel⁃concrete composite bridge deck

Hua-wen YE1(),Zhi-chao DUAN1,Ji-lin LIU1,Yu ZHOU1,Bing HAN2   

  1. 1.School of Civil Engineering，Southwest Jiaotong University，Chengdu 610031，China
    2.Southern Sichuan Intercity Railway Co. ，Ltd. ，Chengdu 610031，China
  • Received:2021-03-15 Online:2022-08-01 Published:2022-08-12

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Abstract:

A theoretical model is proposed for the wheel-load diffusion to investigate the transmission mechanism of vertical loading on the steel-concrete composite bridge deck system under local wheel loads. An existed full-scale test model was referred and the corresponding finite element numerical simulation were also conducted to verify the presented model and analysis the key parameters. The results show that， rather than the traditional assumption of 45 degree diffusion effect， the pressure on the steel top plate of the composite deck under vehicle loads has a significant local effect along the transverse direction of U-rib， and the sharing law of the wheel load could be obtained from the 3-span beam simply supported by the webs of U-rib. The paramelric analysis shows that， the proposed theoretical model is conservative in the common value range of engineering parameter of orthotropic steel-concrete composite bridge deck， and it could be referred to the design of orthotropic composite bridge deck.

Key words: bridge engineering, orthotropic steel-concrete composite bridge deck, wheel load, diffusion angle, concrete overlay

CLC Number: 

  • U443.3

Fig.1

Model of 3-span simply supported beam"

Fig.2

Calculation model of wheel load sharing rate of steel bridge deck under typical working conditions"

Fig.3

Full-scale model for orthotropic steel-concrete composite bridge deck"

Fig.4

FE modelling for full-scale test model"

Fig.5

Transversal stress in midspan cross-section"

Fig.6

Transversal stress at cross-section C-C"

Fig.7

Comparison of experimental and numerical deflection"

Fig.8

Pressure distribution on the steel top plate"

Fig.9

Sharing ratios of the steel top plate"

Table 1

Effect of stud spacing and diameter"

栓钉间距

/mm

中心加载/%偏心加载/%栓钉直径 /mm中心加载/%偏心加载/%
δ1δ2δ1δ2δ1δ2δ1δ2
1509.6434.3723.2440.39910.1736.1925.2143.64
30010.0337.1324.5944.36139.6434.3723.2440.39
45010.5838.2526.0645.50179.8335.7524.7243.09
60011.3738.6625.2645.12259.6535.4024.4042.64

Fig.10

Effect of elastic modulus of concrete"

Fig.11

Effect of thickness of concrete overlay"

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