Keywords:Bridge single column, seismic, demand-capacity-ratio, Shear Strength, Flexure Strength
This research studied the performance of existing reinforced concrete bridge columns in Thailand. In terms of Demand-capacity-ratio (DCR ). By using the manual of bridge and road designs for seismic resistance. The areas that may be affected by earthquakes from the past until 2016 comprises (1) Bangkok and its boundary provinces (2) north and west region of Thailand. This paper shows the important structural index of the bridge’s column that can be used as a reference for future research. Moreover, it shows that the biaxial moment is the variable for failure control. Bridges in Bangkok and its boundary provinces have better seismic-resistant performance than bridges in the north and west region of Thailand. The analysis result shows that the DCRM of bridge designed during 1999-2016 is less than the DCRM of bridge designed before 1998. The trends for the performance of bridge safety design is gradually better than the past but still need to be considered, especially the reinforced concrete bridge’s columns for the northern region that DCRM are required to be higher than 0.80.
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