Modeling and assessment of bridge structure for seismic hazard prevention |
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Authors: | Jeng-Wen Lin Cheng-Wu Chen Shang-Heng Chung |
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Institution: | (1) Department of Civil Engineering, Feng Chia University, Taichung, Taiwan, 407, ROC;(2) Institute of Maritime Information and Technology, National Kaohsiung Marine University, Kaohsiung, Taiwan, ROC;(3) Global Earth Observation and Data Analysis Center, National Cheng Kung University, Tainan, Taiwan, 701, ROC; |
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Abstract: | This study uses data from Mao-Luo-Hsi Bridge to model the bridge structure and a set of developed alarm and action values
to formulate guidelines for bridge maintenance and seismic hazard prevention. The bridge model is improved by incorporating
on-site ambient vibration measurement to perform modal analyses. Dynamic analyses of the bridge are implemented using the
established 3D model subjected to uniform loading and seismic force, with or without consideration of soil interaction with
the structure. The maximum displacements for different sections of the bridge are compared, and statistical regression analyses
are used to explore their correlation. Information for bridge safety assessment is proposed, which can mitigate loss of property
and lives due to bridge failure. Regression analyses of the maximum displacements between abutments D and E of the considered
bridge in the axial, horizontal, and vertical directions under various seismic intensities are conducted, giving R
2 values of 0.9462, 0.9352, and 0.9010, respectively. The developed maintenance guidelines are reliable since all parameters
from regression analyses have a 95% confidence interval excluding the zero value. The bridge alarm value and action value
are determined for this bridge site at earthquake intensity scales of 4 and 5, respectively. |
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