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Title |
A Review of the Deterioration and Damage of the Top Flange of the Highway PSC Box Girder Bridge based on the Condition Assessment Results
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Authors |
구영호(Young-Ho Ku) ; 한상묵(Sang-Mook Han) |
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DOI |
https://doi.org/10.11112/jksmi.2022.26.6.23 |
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Keywords |
PSCB 거더교; 상부플랜지; 교면포장; 균열; 열화; 손상 PSCB girder bridge; Top flange; Bridge pavement; Crack; Deterioration; Damage |
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Abstract |
Although PSCB girder bridges account for 4% of the bridges in use on highways, they do not account for much, but 98% of PSCB girder bridgesare 1sttype and 2ndtype of bridge. Also, the total length of the PSCB girder bridge is 16% (192km) of the total length of the highway bridge. Thus, thePSCB girder bridge can be one of the bridge types where maintenance is important. In order to analyze the damage types of PSCB girder bridges, a detailedanalysis was conducted by selecting 62 places (477 spans) precision safety diagnosis reports considering ratio of the construction method and snow removalenvironment exposure class. Analysis of report and a field investigation was conducted, and as a result, most of the causes of deterioration damage werecaused by rainwater (salt water) flowing into the bridge pavement soaking in between the top flange and the interface. After concrete slab deteriorateoccurred then bridge pavement cracking and breaking increased and exfoliation of concrete occurred by corrosion and expansion of the reinforcing barsoccurred. In addition, the cause of cracks in the longitudinal direction on the bottom of the top flange is considered to be cracks caused by restrained dryingshrinkage. In conclusion, for reasonable maintenance considering the characteristics of PSCB girder bridges, it should be suggested in the design aspectthat restrained drying shrinkage crack on top flange. Also, it is believed that differentiated maintenance method should be proposed according to snowremoval environment exposure class.
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