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Title |
Experimental Study on the Strengthening Effect of External Prestressing Method Considering Deterioration
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Authors |
김상현(Sang-Hyun Kim) ; 정우태(Woo-Tai Jung) ; 강재윤(Jae-Yoon Kang) ; 박희범(Hee-Beom Park) ; 박종섭(Jong-Sup Park) |
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DOI |
https://doi.org/10.11112/jksmi.2021.25.1.1 |
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Keywords |
외부긴장; 보강효과; 노후도; 노후교량; 교량 보강공법 External Prestressing; Strengthening effect; Deterioration; Deterioration Bridge; Bridge Strengthening Method |
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Abstract |
Concrete structures gradually age due to deterioration of materials or excess loads and environmental factors, and their performance decreases, affecting the usability and safety of structures. Although external tension construction methods are widely used among the reinforcement methods of old bridges, it is insufficient to identify the effects and effects of reinforcement depending on the level of aging. Therefore, in this study, a four-point loading experiment was conducted on the subject with the non-reinforced and external tensioning method to confirm the reinforcement effect of the external tensioning method, assuming the aging of the structure as a reduction in the compressive strength and tensile reinforcement of concrete, to analyze the behavior of the reinforcement and confirm the reinforcement effect. As a result of the experiment, it was difficult to identify the amount of reinforcement in the extreme condition due to early elimination of the anchorage. Therefore, compliance with the regulations on anchor bolts is required when applying the external tension reinforcement method. Crack load and yield load increased depending on whether external tension was reinforced, but before the crack, the stiffness before and after reinforcement was similar, making it difficult to confirm the reinforcement effect.
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