[1] Liu Yun, Qian Zhendong,. Double-layer model updating for steel-concrete composite beamcable-stayed bridge based on GPS [J]. Journal of Southeast University (English Edition), 2008, 24 (1): 80-84. [doi:10.3969/j.issn.1003-7985.2008.01.018]

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Double-layer model updating for steel-concrete composite beamcable-stayed bridge based on GPS()

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

24

Issue:

2008 1

Page:

80-84

Research Field:

Traffic and Transportation Engineering

Publishing date:

2008-03-30

Info

Title:

Double-layer model updating for steel-concrete composite beamcable-stayed bridge based on GPS

Author(s):

Liu Yun;  Qian Zhendong

School of Transportation, Southeast University, Nanjing 210096, China

Keywords:

steel-concrete composite beam;  GPS;  dynamic response;  double-layer model updating

PACS:

U448

DOI:

10.3969/j.issn.1003-7985.2008.01.018

Abstract:

In order to establish the relationship between the measured dynamic response and the health status of long-span bridges, a double-layer model updating method for steel-concrete composite beam cable-stayed bridges is proposed.Measured frequencies are selected as the first-layer reference data, and the mass of the bridge deck, the grid density, the modulus of concrete and the ballast on the side span are modified by using a manual tuning technique. Measured global positioning system(GPS)data is selected as the second-layer reference data, and the degradation of the integral structure stiffness EI of the whole bridge is taken into account for the second-layer model updating by using the finite element iteration algorithm.The Nanpu Bridge in Shanghai is taken as a case to verify the applicability of the proposed model updating method.After the first-layer model updating, the standard deviation of modal frequencies is smaller than 7%.After the second-layer model updating, the error of the deflection of the mid-span is smaller than 10%.The integral structure stiffness of the whole bridge decreases about 20%.The research results show a good agreement between the calculated response and the measured response.

References:

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[11] Cheng Jin, Jiang Jianjing, Xiao Rucheng, et al.Advanced aerostatic stability analysis of cable-stayed bridges using finite-element method[J].Computers and Structures, 2002, 80(13):1145-1158.
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Memo

Memo:

Biographies: Liu Yun(1981—), male, graduate;Qian Zhendong(corresponding author), female, doctor, professor, qianzd@seu.edu.cn.
Foundation item: The Special Project of the Ministry of Construction of China(No.20060909).
Citation: Liu Yun, Qian Zhendong.Double-layer model updating for steel-concrete composite beam cable-stayed bridge based on GPS[J].Journal of Southeast University(English Edition), 2008, 24(1):80-84.

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