, The mean displacement monitoring table (mm) Date Monitoring point1 Monitoring Point2 Monitoring Point3 Monitoring Point4, Table 3.2

, With the data of Table 3.1 and Table 3.2, the mean result were drawn line chart of the main beam under permanent load condition as shown in Fig 3

R. 1. Yung-li-lee, J. Pan, R. B. Hathaway, and M. E. Barkey, Fatigue Testing and Analysis(Theory and Practice), 2005.

L. Stuart, Data Analysis for Science and Engineering, 1975.

L. Sifeng, Gray System Theory and Application, 2004.

Y. Tinghua, L. Hongnan, and G. Ming, Recent Research and Application of GPS Based Technology for Bridge Health Monitoring, pp.2597-2610, 2010.

A. Ying and L. Zhao-xia, Parameter Estimation and Test of Fatigue Stress Probability Distribution Function of Large Span Bridge Based on Monitoring Samples, Modern Traffic Technology, pp.17-21, 2008.

, Morris Foundations of Structural Optimization: A Unified Approach, AJ, 1982.

R. Fox and M. Kapoor, Rates of change of eigenvalues and eigenvectors., AIAA Journal, vol.2, issue.12, p.24212429, 1968.
DOI : 10.2514/3.4587

P. W. Mo11er and O. Friberg, Updating Large Finite Element Models in Structural Dynamics AIAA Jouma1, pp.36-1861, 1998.

J. Zhao, D. Wolfj, and T. , Sensitivity Study for Vibrational Parameters Used in Damage Detection, Journal of Structural Engineering, vol.125, issue.4, pp.41-57, 1999.
DOI : 10.1061/(ASCE)0733-9445(1999)125:4(410)

A. K. Pmdey and M. Biswas, Damage Detection in Structures Using Changes in Flexibility, Joumal of Sound and Vibration, pp.3-17, 1994.