Evaluation of the static and dynamic structural performance of segmental pre-stressed concrete box girder bridge after repairing and strengthening

doi:10.1007/s11709-013-0196-8

Front Struc Civil Eng

2013, Vol. 7

Issue (2) : 164-177 https://doi.org/10.1007/s11709-013-0196-8

RESEARCH ARTICLE

Evaluation of the static and dynamic structural performance of segmental pre-stressed concrete box girder bridge after repairing and strengthening

Ali Fadhil NASER(

), Zonglin WANG

School of Transportation Science and Engineering, Bridge and Tunnel Engineering, Harbin Institute of Technology, Harbin 150090, China

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Abstract

The objectives of this study are to explain the repairing and strengthening methods which are used to improve the structural performance of the bridge structure, to analyze the static and dynamic responses after strengthening, and to evaluate the performance of the bridge structure after repairing and strengthening. The methods of repairing and strengthening include reconstruction the deck of the bridge by casting 10 cm layer of concrete, strengthening the web and bottom floor of box girders of middle spans and side spans by sticking the steel plates, strengthening the whole bridge structure by using external pre-stressing tendons, and treatment the cracks. The results of theoretical analysis show that the values of tensile stress and vertical deflection are decreased and the compressive stress is increased after strengthening. There are not tensile stresses are appeared in the sections of the bridge structure. The modal analysis results show that the value of natural frequency is equal to 2.09 Hz which is more than the values before strengthening which is equal to 1.64 Hz, indicating that the stiffness of the bridge structure is improved and the strengthening process is effective to improve the cracks resistance and bearing capacity of the bridge structure.

Keywords structural performance steel plates external pre-stressing cracks grouting method static

Corresponding Author(s): NASER Ali Fadhil,Email:ali_hu73@yahoo.com

Issue Date: 05 June 2013

Cite this article:

Ali Fadhil NASER,Zonglin WANG. Evaluation of the static and dynamic structural performance of segmental pre-stressed concrete box girder bridge after repairing and strengthening[J]. Front Struc Civil Eng, 2013, 7(2): 164-177.

URL:

https://academic.hep.com.cn/fsce/EN/10.1007/s11709-013-0196-8
https://academic.hep.com.cn/fsce/EN/Y2013/V7/I2/164

Fig.1 The Sanguxian bridge. (a) Longitudinal view; (b) transverse view

Fig.2 The layout of the bridge sections. (a) Pier box girder; (b) mid-span box girder (unit: cm)

Fig.3 The bridge deck system after reconstruction. (a) Bridge deck; (b) expansion joint

Fig.4 The strengthening of the inside of the box girders webs

Fig.5 The strengthening of the outside of the box girders webs. (a) The first span; (b) the second span

Fig.6 The layout of steel plates in the strengthening of box girders bottom floors. (a) Transverse section; (b) top view of side spans; (c) top view of middle span; (d) outside bottom floor of span No. 1; (e) outside bottom floor of span No. 1 and No. 2 (Unit: cm)

Fig.7 The transverse layout of external pre-stressing. (a) Mid-span box girder; (b) pier box girder

Fig.8 The external pre-stressing after construction. (a) Near abutment; (b) pier top box girder

Fig.9 The anchor beams after construction. (a) Pier anchor beam; (b) inside of abutment anchor beam

Fig.10 The deviator devices after construction. (a)Steel deviator fixed in bottom floor of side spans; (b) steel deviator fixed in web of secondary spans and middle span; (c) concrete deviator

Fig.11 The damping devices. (a) Front view; (b) top view; (c) after finish the construction (unit: cm)

Fig.12 The bridge model. (a)Elevation view; (b) transverse view; (c) pre-stressed tendons layout

Fig.13 The values of stress before and after strengthening due to load combination I. (a) Top of box girder; (b) bottom of box girder

Fig.14 The vertical deflection before and after strengthening due to load combination I

Fig.15 The values of stress before and after strengthening due to load combination II. (a) Max. value of box girder top; (b) max. value of box girder bottom; (c) min. value of box girder top; (d) min. value of box girder bottom

Fig.16 The vertical deflection before and after strengthening due to load combination II

Fig.17 The first four modes shape of modal analysis

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