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http://dx.doi.org/10.12989/acc.2017.5.5.469

Shear-lag behavior of prestressed concrete box-girder bridges during balanced cantilever construction

Zhong, Xingu (School of Civil Engineering, Hunan University of Science and Technology: Hunan Provincial Key Laboratory of Structural Engineering for Wind Resistant and Vibration Control)
Zhang, Tianyu (School of Civil Engineering, Hunan University of Science and Technology: Hunan Provincial Key Laboratory of Structural Engineering for Wind Resistant and Vibration Control)
Shu, Xiaojuan (School of Civil Engineering, Hunan University of Science and Technology: Hunan Provincial Key Laboratory of Structural Engineering for Wind Resistant and Vibration Control)
Xu, Hongliang (China CEC Engineering, Corporation)

Publication Information

Advances in concrete construction / v.5, no.5, 2017 , pp. 469-479 More about this Journal

Abstract

Balanced cantilever construction is extensively used in the construction of prestressed concrete (PSC) box-girder bridges. Shear-lag effect is usually considered in finished bridges, while the cumulative shear-lag effect in bridges during balanced cantilever construction is considered only rarely. In this paper, based on the balanced cantilever construction sequences of large-span PSC box-girder bridges, the difference method is employed to analyze the cumulative shear-lag effect of box girders with varying depth under the concrete segments' own weight. During cantilever construction, no negative shear-lag effect is generated, and the cumulative shear-lag effect under the balanced construction procedure is greater than the instantaneous shear-lag effect in which the full dead weight is applied to the entire cantilever. Three cross-sections of Jianjiang Bridge were chosen for the experimental observation of shear-lag effect, and the experimental results are in keeping with the theoretical results of cumulative shear-lag effect. The research indicates that only calculating the instantaneous shear-lag effect is not sufficiently safe for practical engineering purposes.

Keywords

box-girder bridges; balanced cantilever construction; shear-lag effect; the cumulative effect; prestress;

Citations & Related Records

Reference

1	Mondali, M., Abedian, A. and Ghavami, A. (2009), "A new analytical shear-lag based model for prediction of the steady state creep deformations of some short fiber composites", Mater. Des., 30(4), 1075-1084. DOI
2	National Standard of the People's Republic of China (2004), Code for Design of Highway Reinforced Concrete and Prestressed Concrete Bridges and Culverts, China Communications Press, Beijing, China.
3	Zhang, S.D. and Wang, W.Z. (2004), The Negative Shear-Lag Effect of Bridge Structures, 1st Edition, China Communications Press, Beijing, China.
4	Zhang, S.D., Deng X.H. and Wang, W.Z. (1998), The Shear-Lag Effect of Thin-Walled Box Girder, 1st Edition, China Communications Press, Beijing, China.
5	Zhou, J.S. and Lou, Z.H. (2000), "The status quo and developing trends of large span prestressed concrete bridges with continuous rigid frame structure", J. Chin. High., 13(1), 31-36.
6	AASHTO LRFD Bridge Design Specifications (SI Units), (2004), American Association of State Highway and Transportation Officials, 3rd Edition, Washington, U.S.A.
7	Cheng, Q.Y. (1987), "The negative shear-lag in thin-walled cantilever box girder", Chin. Quarter. Mech., 2, 52-62.
8	Collection of German Standards for Bridge (1997), Highway Planning and Design Institution of the Department of Transportation.
9	Gara, F., Leoni, G. and Dezi, L.A. (2009), "A beam finite element including shear lag effect for the time-dependent analysis of steel-concrete composite decks", Eng. Struct., 31(8), 1888-1902. DOI
10	Graham, D.A., Carradine, D.M. and Bender, D.A. (2010), "Monotonic and reverse-cyclic loading of lag screw connections for log shear wall construction", J. Mater. Civil Eng., 22(1), 88-95. DOI
11	Guo, J.Q., Fang, Z.Z. and Luo X.D. (1983), "Analysis of shear-lag effect of box girder bridges", Chin. J. Civil Eng., 16, 1-13.
12	Luo, Q.Z. (2005), "Theoretical and experimental study on shear-lag in thin-walled box girder based on energy principle", Ph.D. Dissertation, Hunan University, Changsha, China.