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구조물 보강용 FRP 판과 광섬유 센서가 결합된 자기감지 보강재
송세기(Song, Se-Gi),서수연(Seo, Soo-Yeon),김강수(Kim, Kang Su) 대한건축학회 2019 大韓建築學會論文集 : 構造系 Vol.35 No.8
Recently, it is required to develop a monitoring technology that combines an FBG sensor as a means for continuously monitoring whether reinforcing effect of FRP is maintained on FRP reinforced structural members. However, most existing researches focus on the insertion of FBG sensors into bar-shaped FRPs, and there is insufficient study on the details strip-type FRPs combined with FBG sensors. Therefore, in this paper, it is studied to develop a reinforcement in which a FBG sensor is combined with a FRP strip. Especially, combination of FRP and FBG sensor. For this, a series of experiments were performed to find the adhesive strength of fiber-FRP-epoxy joints, the tensile strength of FBG sensor part with reflection-lattice, and the performance depending on the connection method of FRF and FBG sensor. As a result of the study, it was found that a minimum strength of 216.15 N/㎟ is required for incorporating FBG sensors in FRP using epoxy. It is considered that the adhesion length of epoxy joints should be more than 50mm. When the FBG sensor is attached to the FRP strip as an epoxy, it is considered appropriate to use the complete attachment and the sensor non-attachment method.
비내진 설계된 철도역사 건물의 증축방식에 따른 내진성능 평가
송세기(Se-gi Song ),서수연(Soo-yeon Seo) 한국철도학회 2017 한국철도학회 학술발표대회논문집 Vol.2017 No.05
최근 경주지진을 계기로, 노후 건물들에 대한 내진성능평가가 이루어지고 있으며 내진성능이 부족한 건물에 대해서는 내진보강을 하는 사례가 증가하고 있다. 특히 공공성이 높은 학교와 철도역사 건물에 대해서는 그 중요성이 인지되어 전반적인 내진성능평가 업무가 진행되고 있다. 우리나라의 내진설계기준은 1978년 제정되었으며, 그 이후, 지속적으로 강화되어왔기 때문에, 오래된 철도역사 건물의 경우에는 지진에 대한 안전성의 확인이 필요하다. 특히 수직방향으로 증축된 건물의 경우에는 더욱 그러하다. 따라서 이들 건물들에 대해서는 내진성능평가를 통하여 안전성을 평가하고 필요 시 보강을 해야 한다. 본 논문에서는, 내진설계가 되지 않은 2층 철근콘크리트 철도역사 건물을 4층으로 증축한 경우 내진성능을 평가하고자 한다. 특히, 두 가지 증축방식, 즉 철골구조와 철근콘크리트구조로 증축된 경우에 대하여 내진성능을 평가하고, 그에 따른 보강방안을 해석적으로 연구하였다. In the wake of the Gyeongju earthquake, seismic performance evaluation for old buildings has been being conducted and for buildings that lack seismic performance, seismic retrofitting is increasing. Especially, the importance of public high schools and railway station buildings is recognized and overall seismic performance evaluation work is proceeding. Since Korea"s seismic design code was enacted in 1978 and since then has been continuously strengthened, it is necessary to confirm the safety of earthquake in the case of old railway station buildings. Therefore, the safety of these buildings should be assessed through a proper seismic performance evaluation and reinforced if necessary. In this paper, the seismic performance is evaluated when the two - storey reinforced concrete (RC) railway station building without seismic design is extended to four stories. Especially, in case of steel structure and RC structure as the extended structure, the seismic performance of the building was evaluated by analytical study, respectively.