Journal of Jilin University(Engineering and Technology Edition) ›› 2024, Vol. 54 ›› Issue (4): 1016-1027.doi: 10.13229/j.cnki.jdxbgxb.20221081

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Overall mechanical performance of jointless bridges with arch structure behind abutment

Qiu ZHAO1(),Peng CHEN1,Yu-wei ZHAO2,Ao YU1   

  1. 1.School of Civil Engineering，Fuzhou University，Fuzhou 350108，China
    2.School of Information Engineering，Wuhan University of Engineering Science，Wuhan 430200，China
  • Received:2022-08-24 Online:2024-04-01 Published:2024-05-17

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Abstract:

Based on the trial design of the actual continuous prestressed concrete jointless bridge structure， the new type of integral jointless bridge with arch structure behind abutment was proposed. The three-dimensional beam-truss calculation model and the solid finite element model of the new structure was established. The effect of the interaction between the pile foundation and the soil around the pile was considered， and the half bridge organic glass model test was designed according to the principle of similarity ratio to verify the correctness of the simulation method. The verified numerical model was used to establish the full bridge beam-truss model and the full bridge solid model for the arch structure behind the abutment， and the effect of rise-span ratio and pile length on the overall mechanical performance was analyzed. The analysis results show that： The displacement and stress values of the model test are 8% and 21% different from those of the beam-truss model， and -3% and 5.3% different from those of the solid model. With the increase of rise-span ratio， the horizontal constraint on the arch foot decreases， the vertical displacement of the arch crown decreases relatively， the axial force on the main beam decreases gradually， and the bending moment variation range also decreases slightly， the horizontal force generated by the temperature is more transmitted to the arch structure behind the abutment. With the reduction of the pile length， the vertical displacement of the arch crown decreases， the shear force at the pile top decreases relatively， the axial force on the main beam decreases gradually， and the range of bending moment changes slightly decreases. Considering the actual foundation conditions， the jointless bridges with shorter pile length and larger rise-span ratio has better overall mechanical performance.

Key words: bridge engineering, integral jointless bridge, organic glass test, numerical simulation, arch structure, overall mechanical performance

CLC Number: 

  • U441

Fig.1

Diagram of jointless bridges with arch structure behind abutment"

Fig.2

Overall layout"

Fig.3

Three-dimensional frame simplified model"

Fig.4

Finite element model"

Fig.5

Half-bridge organic glass model test"

Fig.6

Loading layout"

Fig.7

Comparison of displacement results"

Fig.8

Comparison of stress results"

Fig.9

Influence of rise-span ratio on main beam deformation"

Fig.10

Influence of rise-span ratio on displacement forarch crown"

Fig.11

Influence of rise-span ratio on shear force atpile top"

Fig.12

Influence of rise-span ratio on horizontal reaction force for arch foot"

Fig.13

Influence of rise-span ratio on axial force forside span"

Fig.14

Influence of rise-span ratio on bending moment for side span"

Fig.15

Influence of pile length on main beam deformation"

Fig.16

Influence of pile length on displacement forarch crown"

Fig.17

Influence of pile length on shear force at pile top"

Fig.18

Influence of pile length on horizontal reactionforce for arch foot"

Fig.19

Influence of pile length on axial force for side span"

Fig.20

Influence of pile length on bending moment for side span"

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