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Title |
Damage-Spread Analysis of Heterogeneous Damage with Crack Degradation Model of Deck in RC Slab Bridges
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Authors |
정현진(Hyun-Jin Jung) ; 안효준(Hyo-Joon An) ; 김재환(Jae-Hwan Kim) ; 박기태(Ki-Tae Part) ; 이종한(Jong-Han Lee) |
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DOI |
https://doi.org/10.11112/jksmi.2022.26.6.93 |
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Keywords |
RC 슬래브교; 단일손상; 이종손상; 열화모델; 손상확산; 상태등급 RC slab bridges; Single damage; Heterogeneous damage; Deterioration model; Damage spread; Condition rating |
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Abstract |
RC Slab bridges in Korea account for more than 70% of the total bridges for more than 20 years of service. As the number of aging structuresincreases, the importance of safety diagnosis and maintenance of structures increases. For highway bridges, cracks are a main cause of deck deterioration,which is very closely related to the decrease in bridge durability and service life. In addition, the damage rate of expansion joints and bearings accountsfor approximately 73% higher than that of major members. Therefore, this study defined damage scenarios combined with devices damages and deckdeterioration. The stress distribution and maximum stress on the deck were then evaluated using design vehicle load and daily temperature gradientfor single and combined damage scenarios. Furthermore, this study performed damage-spread analysis and predicted condition ratings according toa deck deterioration model generated from the inspection and diagnosis history data of cracks. The heterogeneous damages combined with the memberdamages of expansion joints and bearings increased the rate of crack area and damage spread, which accelerated the time to reach the condition ratingof C. Therefore, damage to bridge members requires proper and prompt repair and replacement, and otherwise it can cause the damage to bridge deckand the spread of the damage.
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