24 H.-J. Kim −300 −200 −100 100 0 0 1 −1 −2 −3 2 y = 0.010x - 0.108 R2 = 0.999 3 200 300 Unut themal movement (mm/°C) Distance (m) Fig. 3.3 Relationship between expansion length andST Table 3.1 Analytical comparison of variation rate of displacement to temperature P2 LT T D’ LP2 D0:0001 221 D2:21 mm= ıC PY1 LT T D’ LPY1 D0:0001 163:5 D1:635 mm= ıC PY2 LT T D’ LPY2 D0:0001 163:5 D1:635 mm= ıC A2 LT T D’ LA2 D0:0001 221 D2:21 mm= ıC Table 3.2 Comparison of variation rate of displacement to temperature Location P2 PY1 PY2 A2 L (m) 221 163.5 163.5 221 ST (mm/ ıC) Measurement 2.323 1.831 1.593 2.13 Theory 2.21 1.635 1.635 2.21 3.4 Conclusion After analyzing correlation (from January 1st, 2014 to December 31st, 2014) through the temperature change and GNSS bridge displacement data, we found a high linear correlation between two variables and confirmed that the coefficient of linear expansion of Cheong-Poong bridge was 1.00E-05/ıC. In addition, as we compared the theoretical expansion amount per unit temperature with the measured expansion amount, we found a similar result. After considering the previous research results that a sound structure system showed a linear correlation with strong elastic behaviors depending on the change in temperature and comparing the expansion amount per unit temperature that can evaluate its soundness, we assessed that the structure system and long-term temperature expansion behaviors of Cheong-Poong bridge were quite sound. In order for a precise evaluation of soundness in the future, we expect that a multidimensional analysis of different temperature datasets would be necessary. Acknowledgments This work is a part of a research project supported by Ministry of Science, ICT and Future Planning, Institute for Information & communications Technology Promotion (IITP) through Core Research Project No. R-20160216-002659. The authors wish to express their gratitude for the financial support. References 1. American Association of State Highway and Transportation Officials (AASHTO): AASHTO LRFD bridge design specifications. Washington (2012) 2. Bae, I.H.: Measurement analysis and management of special bridges. In: Annual Seminar on the Operation and Maintenance of Cable-Supported Bridges in Korea, The New Airport Highway Corporation (in Korean) (2011)
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