Influence of Differential Shrinkage on Long-Term Deflection of 
Long-Span Continuous Rigid Frame Bridge

ZHANG Yuntao; MENG Shaoping; LIU Anzhong

doi:10.3969/j.issn.0258-2724.2011.03.004

Volume 24 Issue 3

May 2011

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Journal of Southwest Jiaotong University > 2011 > 24(3): 379-384.

JIANG Qilong, HU Zhenqiu. Improved Incomplete Derivative PID Control of Axial Active Magnetic Bearing[J]. Journal of Southwest Jiaotong University, 2015, 28(2): 241-246. doi: 10.3969/j.issn.0258-2724.2015.02.006

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ZHANG Yuntao, MENG Shaoping, LIU Anzhong. Influence of Differential Shrinkage on Long-Term Deflection of Long-Span Continuous Rigid Frame Bridge[J]. Journal of Southwest Jiaotong University, 2011, 24(3): 379-384. doi: 10.3969/j.issn.0258-2724.2011.03.004

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Influence of Differential Shrinkage on Long-Term Deflection of Long-Span Continuous Rigid Frame Bridge

doi: 10.3969/j.issn.0258-2724.2011.03.004

Received Date: 03 May 2010
Publish Date: 25 Jun 2011

Abstract

Abstract

In order to fully consider the influence of differential shrinkage on the long-term deflection of a long-span continuous rigid-frame concrete bridge, formulas for calculating equivalent shrinkage strain were deduced based on a normal section assumption. Bar-system FEM (finite element method) was used to calculate the long-term deformation of Sutong continuous rigid-frame bridge due to differential shrinkage, and the equivalent shrinkage strain was simulated with the cooling method. The research results show that when the effect of differential shrinkage is considered the deflection at mid-span of Sutong continuous rigid-frame bridge is 6.0 cm larger than that based on the conventional method. The long-term deflection due to differential shrinkage resulted from different thicknesses of flanges is up to 5.5 cm, while it is only 0.5 cm due to differential shrinkage resulted from different ratio of reinforcement. The deformation due to differential shrinkage is significant and should be considered in camber setting of long-span concrete box girder bridges.
- continuous rigid-frame bridge,
- long-term deflection,
- differential shrinkage,
- theoretical thickness,
- ratio of reinforcement,
- equivalent strain

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Influence of Differential Shrinkage on Long-Term Deflection of Long-Span Continuous Rigid Frame Bridge

doi: 10.3969/j.issn.0258-2724.2011.03.004

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Influence of Differential Shrinkage on Long-Term Deflection of Long-Span Continuous Rigid Frame Bridge

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