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Evaluation of Bridge Safety Based on Concrete Nondestructive Test

  • Pei-Ling Liu (a1) and Pi-Fen Sun (a1)

Abstract

This paper develops a framework for the safety assessment of bridges based on the nondestructive test (NDT) results of concrete. The transient elastic wave test is performed to measure the P wave velocity of concrete. The Bayesian approach is adopted to construct the posterior distribution of concrete strength. Then, reliability analysis is carried out to evaluate the safety of the bridge using the modified distribution. The limit-state function is formulated according to the AASHTO specifications. Finally, the reliability index is compared to the target reliability to see if repair or reconstruction is required. A numerical example is presented to illustrate the safety assessment of a solid-slab bridge using the proposed method.

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*Associate Professor

References

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1ASTM C597, “Standard Test Method for Pulse Velocity through Concrete,” Annual Book of ASTM Standards 04.02 (1997).
2ASTM C805, “Standard Test Method for Rebound Number of Hardened Concrete,” Annual Book of ASTM Standards 04.02 (1997).
3Wu, T. T., Liu, P. L., Wang, G. Y. and Tong, J. H., “Nondestructive tests for Estimating Concrete Strength,” Proc. 1st NDT Conference on Infrastructures, Taipei (1999).
4Liu, P.-L. and Chen, Y.-S., “The Re-Evaluation of Structural Reliability Based on Identification Results,” The Chinese Journal of Mechanics — Series A, 15(3), pp. 109116 (1999).
5Madsen, H. O., Krenk, S. and Lind, N. C., Methods of Structural Safety, Prentice-Hall, New Jersey (1986).
6Nowak, A. S., “Calibration of LRFD Bridge Code,” Journal of Structural Engineering, 121(8), pp. 12451251 (1995).
7Nowak, A. S., Yamani, A. S. and Tabsh, S. W., “Probabilistic Models for Resistance of Concrete Bridge Girders,” ACI Structural Journal, 91(3), pp. 269275 (1995).
8Das, P. C. (ed.) Safety of Bridges. American Society of Civil Engineers, New York (1997).
9Tabsh, S. W., “Reliability of Highway Girder Bridges,” Journal of Structural Engineering, 117(8), pp. 23722388.
10Barker, R. M., Design of highway bridges: Based on AASHTO LRFD bridge design specifications. John Wiley, New York (1997).

Keywords

Evaluation of Bridge Safety Based on Concrete Nondestructive Test

  • Pei-Ling Liu (a1) and Pi-Fen Sun (a1)

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