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Journal of Structural Engineering / Volume 137 / Issue 12 / TECHNICAL PAPERS

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Estimation of Error Factors in Concrete Cable-Stayed Structures with Sensitivity of Creep

J. Struct. Eng. 137, 1451 (2011); http://dx.doi.org/10.1061/(ASCE)ST.1943-541X.0000400 (9 pages)

Jong-Bum Park1, Jung Il Park2, and Jae-Yeol Cho, M.ASCE3

1Postdoctoral Fellow, Dept. of Civil Engineering, Seoul National Univ., Seoul, Korea.
2Managing Director, Head of the Technical Institute of E&C, Cheil Engineering Co., Ltd., Seoul, Korea.
3Assistant Professor, Dept. of Civil & Environmental Engineering, Seoul National Univ., Seoul, Korea (corresponding author). E-mail: jycho@snu.ac.kr

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(Submitted 2 January 2010; accepted 16 February 2011; posted ahead of print 18 February 2011)

This study proposes a method for estimating the properties of concrete creep and the unstrained length of cable, by using measured displacements and cable tension forces, in a concrete cable-stayed structure over time. The method is proposed on the basis of minimizing the differences between the actual measured responses of the structure and the predicted values that were calculated by using finite element analysis. The creep model uncertainty factor was introduced to characterize the incompleteness or inadequacy of the deterministic formulas of a given model. This factor was selected as the sole parameter to be estimated from the parameters relevant to the creep model. The numerical examples used in this analysis revealed good feasibility of this methodology for parameter estimation. These examples also supported the importance of considering concrete creep properties as a structural error factor in concrete cable-stayed structures. The estimated concrete creep properties may be used to reduce the long-term error associated with concrete creep in concrete cable-stayed structures.

© 2011 American Society of Civil Engineers

Acknowledgments

This research was supported by a grant (09CCTI-A052531-02-000000) from the Ministry of Land, Transport and Maritime of the Korean government through the Core Research Institute at Seoul National University for Core Engineering Technology Development of Super Long Span Bridge R&D Center.

Article Outline

  1. Introduction
  2. Model Uncertainty Factor of the Creep Model
  3. Parameter Estimation Formulation
    1. Modeling of Creep
    2. Modeling of the Catenary Cable Element
    3. Sensitivity of Displacement and Cable Force with Respect to the Creep Model Uncertainty Factor
    4. Sensitivity of Displacement and Cable Tension Force with Respect to Unstrained Cable Length
    5. Estimation of Parameters
  4. Numerical Verification
    1. Description of Structure
    2. Case Studies of Parameter Estimation
    3. Results of Parameter Estimations
  5. Concluding Remarks

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ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1061/(ASCE)ST.1943-541X.0000400

PUBLICATION DATA

ISSN

0733-9445 (print)  
1943-541X (online)

Publisher

American Society of Civil Engineers

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