Mechanical characteristics of jointless bridge with wall-type integral abutment

ZHU Wei-qing; HENG Jiang-feng; LIU Yong-jian; WANG Wei-shan

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ZHU Wei-qing, HENG Jiang-feng, LIU Yong-jian, WANG Wei-shan. Mechanical characteristics of jointless bridge with wall-type integral abutment[J]. Journal of Traffic and Transportation Engineering, 2017, 17(6): 36-45.

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ZHU Wei-qing, HENG Jiang-feng, LIU Yong-jian, WANG Wei-shan. Mechanical characteristics of jointless bridge with wall-type integral abutment[J]. Journal of Traffic and Transportation Engineering, 2017, 17(6): 36-45.

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Mechanical characteristics of jointless bridge with wall-type integral abutment

1.
School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China
2.
Xi'an Highway Institute, Xi'an 710065, Shaanxi, China

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Author Bio:
ZHU Wei-qing(1987-), male, lecturer, PhD, zhuweiqing87@126.com
Received Date: 2017-07-03
Publish Date: 2017-12-25

Abstract

Abstract

The spatial finite element model of jointless bridge with wall-type integral abutment was established under considering the abutment-soil interaction, and its accuracy was validated by using the measured data.The mechanical characteristics of main girder and abutment under different load cases were analyzed, and the effects of temperature, backfill compactness and bridge span on the mechanical characteristics were studied.Research result shows that, compared to the simply supported girder bridge with same span, the mid-span moment of worst stress condition's main girder of jointless bridge with wall-type integral abutment decreases by 20%-40%, and the sum of mid-span moment and girder-end moment decreases by 28%, which indicates that the distribution of internal force is more balance, and the structural integrity of longitudinal and transverse directions is more obvious.The top of abutment has larger moment and shear force, and the deformation of abutment is complex.The internal force and deformationof jointless bridge with wall-type integral abutment are sensitive to temperature actions.That gradient temperature rises and overall temperature decreases causes girder-end positive moment, and that gradient temperature decreases and overall temperature rises causes girder-end negative moment, so suitable load cases should be chosen for different members during design process.When the backfill compactness changes from loose to compact, the variations of main girder's end and mid-span moments are less than 5% when overall temperature rises or decreases, and the variation of abutment deformation is less than 9%, which indicates that backfill compactness has little effect on main girder moment and abutment deformation.When the bridge span changes from 6 mto 13 m, the top moment of abutment increases by 1.781 times, and the internal force of abutment increases rapidly.Therefore, it is suggested that the bridge span should not exceed10 mduring the design process of jointless bridge with wall-type integral abutment to control the concrete crack width of abutment under the serviceability limit state.
- bridge engineering,
- integral jointless bridge,
- finite element model,
- mechanical characteristic,
- abutment-soil interaction,
- span limit

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References(32)

References

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