Shrinkage and creep effects of long-span simple-supported-to-continuous box girder bridge

ZHOU Xu-hong; QIAO Peng; DI Jin; LU: Zhong-da; CUI Ting

doi:10.19818/j.cnki.1671-1637.2009.02.008

Volume 9 Issue 2

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Article Navigation > Journal of Traffic and Transportation Engineering > 2009 > 9(2): 39-44

ZHOU Xu-hong, QIAO Peng, DI Jin, LU: Zhong-da, CUI Ting. Shrinkage and creep effects of long-span simple-supported-to-continuous box girder bridge[J]. Journal of Traffic and Transportation Engineering, 2009, 9(2): 39-44. doi: 10.19818/j.cnki.1671-1637.2009.02.008

Citation:

ZHOU Xu-hong, QIAO Peng, DI Jin, LU: Zhong-da, CUI Ting. Shrinkage and creep effects of long-span simple-supported-to-continuous box girder bridge[J]. Journal of Traffic and Transportation Engineering, 2009, 9(2): 39-44. doi: 10.19818/j.cnki.1671-1637.2009.02.008

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Shrinkage and creep effects of long-span simple-supported-to-continuous box girder bridge

doi: 10.19818/j.cnki.1671-1637.2009.02.008

1.
School of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, Gansu, China
2.
School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China

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Author Bio:
ZHOU Xu-hong(1956-), male, professor, PhD, +86-29-82334828, zxh@chd.edu.cnzxh@chd.edu.cn
Received Date: 2008-12-25
Publish Date: 2009-04-25

Abstract

Abstract

The stress distributions and deformations of long-span simple-supported-to-continuous box girder bridge during different construction stages were calculated by bar finite element models. The influence of prestressed bar's second-time stretching on shrinkage and creep effects was studied. Taking the 6×70 m continuous box girder bridge as an example, according to different types of calculating methods, including the original algorithm of aging theory, the modified algorithm of aging theory, the algorithm in the annex of JTJ 023—85 Code and the algorithm in the annex of JTG D62—2004 Code, the influences of shrinkage and creep effects on the stresses and deformations of box girders during simple-supported stage and continuous stage were compared. Computational result shows that the maximum influencing discrepancies of stresses at mid spans and supporting points are within 15%, and the maximum influencing discrepancies of deflections at the mid-sections of end span, side span and midspan are separately 36%, 79% and 54%. The deflection calculated by the algorithm in the annex of JTJ 023—85 Code is smallest, while that calculated by the algorithm in the annex of JTG D62—2004 Code is biggest and also is closest to the actual measured value. It's confirmed that the theoretic analysis of shrinkage and creep effects is reliable.
- bridge engineering,
- prestressed concrete box girder,
- shrinkage and creep,
- second-time stretching,
- structural deflection

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References

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Shrinkage and creep effects of long-span simple-supported-to-continuous box girder bridge

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