교량 안전등급 평가에 대한 부재 및 점검항목단위 가중치 영향 분석

초록

This study analyzed the effect of changes in member and inspection item weighting factors on the overall safety rating within the bridge condition evaluation system. According to investigation of domestic bridge accidents, 47.83% of the incidents were caused by substructure failures. The current evaluation system assigns relatively low weighting factors to substructures, which may not adequately reflect their structural importance. To analyze the characteristics of the existing safety rating system, various scenarios involving adjustments to the weighting factors of substructures and other components were compared. According to the analysis, increasing the weighting factors assigned to the substructure and durability item resulted in a relative decrease in the weighting factor ratios of other members, whereas decreasing the we.ighting factors assigned to miscellaneous components led to an increase in the weighting factor ratios of other members. And, change in the weighting factor ratios of other members was relatively small compared to change in the adjusted weighting factors. Furthermore, changes in the weighting factor ratios by member and inspection item affected the overall bridge safety grade such that the grade changed depending on whether the relative weighting factor ratio changes exceeded the range that determine the safety grade. When the weighting factor ratio changes was relatively small, the determination range were not altered, and consequently, the overall safety grade remained unchanged. This indicates that the weighting factor of a specific member or inspection item directly influences the overall evaluation result; therefore, it is necessary to determine appropriate weighting ratios by quantitatively assessing the relative influence of each member or component on the overall safety grade. In addition, for determining the bridge safety grade, it may be appropriate to reflect structural characteristics by separating the superstructure and substructure for independent evaluations, or by evaluating them separately and then determining the overall bridge grade.

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