Structural Identification for Structural Health Monitoring of Long-span Bridge - Focusing on Optimal Sensing and FE Model Updating -

- Journal title : Transactions of the Korean Society for Noise and Vibration Engineering
- Volume 25, Issue 12, 2015, pp.830-842
- Publisher : The Korean Society for Noise and Vibration Engineering
- DOI : 10.5050/KSNVE.2015.25.12.830

Title & Authors

Structural Identification for Structural Health Monitoring of Long-span Bridge - Focusing on Optimal Sensing and FE Model Updating -

Heo, Gwanghee; Jeon, Joonryong;

Heo, Gwanghee; Jeon, Joonryong;

Abstract

This paper aims to develop a SI(structural identification) technique using the kinetic energy optimization technique(KEOT) and the direct matrix updating method(DMUM) to decide on optimal location of sensors and to update FE model respectively, which ultimately contributes to a composition of more effective SHM. Owing to the characteristic structural flexing behavior of cable bridges, which makes them vulnerable to any vibration, systematic and continuous structural health monitoring (SHM) is pivotal for them. Since it is necessary to select optimal measurement locations with the fewest possible measurements and also to accurately assess the structural state of a bridge for the development of an effective SHM, a SI technique is as much important to accurately determine the modal parameters of the current structure based on the data optimally obtained. In this study, the KEOT was utilized to determine the optimal measurement locations, while the DMUM was utilized for FE model updating. As a result of experiment, the required number of measurement locations derived from KEOT based on the target mode was reduced by approximately 80 % compared to the initial number of measurement locations. Moreover, compared to the eigenvalue of the modal experiment, an improved FE model with a margin of error of less than 1 % was derived from DMUM. Finally, the SI technique for long-span bridges proposed in this study, which utilizes both KEOT and DMUM, is proven effective in minimizing the number of sensors while accurately determining the structural dynamic characteristics.

Keywords

Optimal Sensor Location;Finite Element Model Update;Kinetic Energy Optimization Technique;Direct Matrix Updating Method;Structural Health Monitoring;Structural Identification;

Language

Korean

References

1.

Lie, S. C. and Yao, J. T. P., 1978, Structural Identification Concept, Journal of the Structural Division, ASCE, Vol. 104, No. ST12, pp. 1845-1858.

2.

Sirca, Jr. G. F. and Adeli, H., 2012, System Identification in Structural Engineering, Sharif University of Technology, Scientia Iranica A, Vol. 19, No. 6, pp. 1355-1364.

3.

Arora, V., 2014, Structural Damping Identification Method using Normal FRFs, International Journal of Solids and Structures, Vol. 51, No. 1, pp. 133-143.

4.

Zheng, Z. D., Lu, Z. R., Chen, W. H. and Liu, J. K., 2015, Structural Damage Identification based on Power Spectral Density Sensitivity Analysis of Dynamic Responses, Computers and Structures, Vol. 146, pp. 176-184.

5.

Dessi, D. and Camerlengo, G., 2015, Damage Identification Techniques via Modal Curvature Analysis: Overview and Comparison, Mechanical Systems and Signal Processing, Vols. 52-53, pp. 181-205.

6.

Shin, S. and Oh, S. H., 2004, Structural Condition Assessment by SI Schemes, Proceedings of the KSNVE Annual Autumn Conference, pp. 419-422.

7.

Wang, M. L., Heo, G. and Satpathi, D., 1997, Dynamic Characterization of a Long Span Bridge: A Finite Element Based Approach, Soil Dynamics and Earthquake Engineering, Vol. 16, No. 7-8, pp. 503-512.

8.

Wang, M. L., Heo, G. and Satpathi, D., 1998, A Health Monitoring system for large Structural Systems, Smart Material and Structures, Vol. 7, No. 5, pp. 627-633.

9.

Udwadia, F. E., 1994, Methodology for Optimum Sensor Locations for Parameter Identification in Dynamic Systems, Journal of Engineering Mechanics, Vol. 120, No. 2, pp. 368-387.

10.

Kammer, D. C., 1992, Effect of Model Error on Sensor Placement for On-orbit Modal Identification of Large Space Structures, Journal of Guidance, Control and Dynamics, Vol. 15, No. 2, pp. 334-341.

11.

Heo. G., Wang, M. L. and Satpathi, D., 1997, Optimal Transducer Placement for Health Monitoring of Long Span Bridge, Soil Dynamics and Earthquake Engineering, Vol. 16, No. 7-8, pp. 495-502.

12.

Heo, G. H., 1997, An Automated Health Monitoring System for Large Civil Structural System, Ph.D. Dissertation, University of New Mexico.

13.

Heo, G., Jeon, J., Lee, C. O. and Lee, W., 2006, FE Model Updating for Health Monitoring of Structures and Its Experimental Verification by Damage Detection, Key Engineering Materials, Vols. 321-323, pp. 268-272.

14.

Pothisiri, T. and Hjelmstad, K., 2003, Structural Damage Detection and Assessment from Modal Response, Journal of Engineering Mechanics, Vol. 129, No. 2, pp. 135-145.

15.

Ge, M. and Lui, E., 2005, Structural Damage Identification using System Dynamic Properties, Computers and Structures, Vol. 83, No. 27, pp. 2185-2196.

16.

Waters, T. P., 1995, Finite Element Model Updating using Measured Frequency Response Functions, Ph.D. Thesis, Department of Aerospace Engineering, University of Bristol, U.K.

17.

Zhang, Q. W., Chang, C. C. and Chang, T. Y. P., 2000, Finite Element Model Updating for Structures with Parametric Constraints, Earthquake Engineering and Structural Dynamics, Vol. 29, No. 7, pp. 927-944.

18.

Suh, S., Jee, T. and Park, Y., 1997, Updating of Finite Element Model and Joint Identification with Frequency Response Function, Transactions of the Korean Society for Noise and Vibration Engineering, Vol. 7, No. 1, pp. 61-69.

19.

Mottershead, J. E. and Freswell, M. I., 1993, Modal Updating in Structural Dynamics : A Survey, Journal of Sound and Vibration, Vol. 16, No. 2, pp. 347-375.

20.

Freswell, M. I. and Mottershead, J. E., 1995, Finite Element Model Updating in Structural Dynamics, Kluwer Academic Publishers.

21.

Baruch, M., 1978, Optimization Procedure to Correct Stiffness and Flexibility Matrices Using Vibration Tests, AIAA Journal, Vol. 16, No. 11, pp. 1208-1210.

22.

Berman, A., 1979, Mass Matrix Correction Using an Incomplete Set of Measured Modes, AIAA Journal, Vol. 17, No. 10, pp. 1147-1148.

23.

Berman, A. and Nagy, E. J., 1983, Improvement of a Large Analytical Model Using Test Data, AIAA Journal, Vol. 21, No. 8, pp. 1168-1173.

24.

Fuh, J. S. and Berman, A., 1986, Comment on Stiffness Matrix Adjustment Using Made Data, AIAA Journal, Vol. 24, pp. 1405-1406.

26.

Ewins, D. J., 2000, Modal Testing : Theory, Practice and Application, R.S.P.