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- 주제어 : External Bond Retrofit (검색결과 6 건)
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Cyclic tests on RC joints retrofitted with pre-stressed steel strips and bonded steel plates
Yunlong Yu,Yong Yang,Yicong Xue,Niannian Wang,Yaping Liu 국제구조공학회 2020 Structural Engineering and Mechanics, An Int'l Jou Vol.75 No.6
An innovative retrofit method using pre-stressed steel strips and externally-bonded steel plates was presented in this paper. With the aim of exploring the seismic performance of the retrofitted RC interior joints, four 1/2-scale retrofitted joint specimens together with one control specimen were designed and subjected to constant axial compression and cyclic loading, with the main test parameters being the volume of steel strips and the existence of externally-bonded steel plates. The damage mechanism, force-displacement hysteretic response, force-displacement envelop curve, energy dissipation and displacement ductility ratio were analyzed to investigate the cyclic behavior of the retrofitted joints. The test results indicated that all the test specimens suffered a typical shear failure at the joint core, and the application of externally-bonded steel plates and that of pre-stressed steel strips could effectively increase the lateral capacity and deformability of the deficient RC interior joints, respectively. The best cyclic behavior could be found in the deficient RC interior joint retrofitted using both externally-bonded steel plates and pre-stressed steel strips due to the increased lateral capacity, displacement ductility and energy dissipation. Finally, based on the test results and the softened strut and tie model, a theoretical model for determining the shear capacity of the retrofitted specimens was proposed and validated.
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FRP판을 이용한 콘크리트 보강에서 보강방법에 따른 부착성능
서수연,오재길,최기봉,Seo, Soo-Yeon,Oh, Jae-Gil,Choi, Ki-Bong 대한건축학회 2011 대한건축학회논문집 Vol.27 No.8
Recently, FRP (Fiber Reinforced Polymer) has been widely applied in retrofit of concrete member owing to its ease construction and high structural capacity compared to other materials. External Bond Retrofit (EBR) using FRP sheet or plate is most popular method for flexural retrofit of concrete member. In strengthened concrete member using this method, however, problems such as dismantling of FRP were founded after retrofit. This causes a strength reduction of the retrofitted member. To resolve this problem, Near-Surface-Mounted Rertofit (NSMR) method was developed and being studied. In this paper, bond capacities of EBR and NSMR using FRP plate were studied experimently and results were compared each other. Main variables in the test were retrofit method, bond length and existence of shear key. From the test results, it was found that the member strengthened by NSMR had almost 1.5 times higher bond strength than that by EBR. The contribution of shear key was not observed when the splitting failure of concrete governed.
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FRP판을 이용한 콘크리트 보강에서 보강방법에 따른 부착성능
서수연(Seo Soo-Yeon),오재길(Oh Jae-Gil),최기봉(Choi Ki-Bong) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.8
Recently, FRP (Fiber Reinforced Polymer) has been widely applied in retrofit of concrete member owing to its ease construction and high structural capacity compared to other materials. External Bond Retrofit (EBR) using FRP sheet or plate is most popular method for flexural retrofit of concrete member. In strengthened concrete member using this method, however, problems such as dismantling of FRP were founded after retrofit. This causes a strength reduction of the retrofitted member. To resolve this problem, Near-Surface-Mounted Rertofit (NSMR) method was developed and being studied. In this paper, bond capacities of EBR and NSMR using FRP plate were studied experimently and results were compared each other. Main variables in the test were retrofit method, bond length and existence of shear key. From the test results, it was found that the member strengthened by NSMR had almost 1.5 times higher bond strength than that by EBR. The contribution of shear key was not observed when the splitting failure of concrete governed.
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서수연,트랜 하이반,김강수,윤현도,이건철 대한건축학회 2023 대한건축학회논문집 Vol.39 No.3
The purpose of this study is to evaluate the long-term behavior of RC beams reinforced by fiber reinforced polymer (FRP) strip such asnear-surface mounted retrofit (NSMR) and externally bonded retrofit (EBR). The 30% loads of nominal strength of the RC beams wereapplied and continued for up to 49 days. The loads were increased up to 55% of the nominal strengths of RC beams at 50 days afterperforming flexural retrofit by using FRP with the planned retrofit methods and have been kept for almost one year. During all loadingperiods, the deflections and the strains of rebars and FRPs were measured at least once every week. The long-term behavior of all specimenswas evaluated and the deflection variations were predicted by considering the long-term effect on the nonlinear sectional analysis result of thereinforced RC beams. As a result, in the specimen reinforced with partially de-bonded NSM FRP, the strains of the FRP strip were notconcentrated on the center of the beam and the magnitude at the center was less than that with the fully bonded FRP. In addition, it ispossible to properly simulate the deflections of the beams strengthened with FRP exposed to a long-term load by considering the long-termeffect on the sectional analysis result. 본 연구에서는 FRP판으로 표면매립과 표면부착 보강된 RC 보들의 장기거동을 평가하고자 한다. RC 보에 공칭강도의 30%에 해당하는 하중을 가력하여 42일을 지속시킨 후, 하중 작용상태에서 계획된 보강방법에 따라 FRP 판으로 휨보강하고 1주일의 양생기간을 거쳐 50일째에는 보강후 공칭강도의 55%로 하중을 증대시키고 약 1년동안 하중을 유지시켰다. 모든 가력기간동안의 처짐과 인장철근 및 FRP의 변형률을 1주일에 최소 1회이상 계측하였다. 모든 실험체의 장기거동을 평가하였고 단면해석결과에 장기재하 효과를 고려하여 처짐의 변화를 평가하였다. 그 결과, 부분 비부착 FRP로 표면매립보강된 실험체는 비부착구간에서 FRP 변형률이 보의 중앙에 집중되지 않음에 따라, 중앙부 변형률이 완전부착인 경우에 비하여 낮게 나타났다. 또한 단면해석결과에 장기거동 효과를 고려함으로써 장기하중에 노출된 FRP 보강 RC 보의 처짐을 적절하게 예측할 수 있는 것으로 나타났다.
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CFRP로 보강된 철근콘크리트 휨부재의 내화성능 개선을 위한 실험
임종욱(Lim, Jong-Wook),서수연(Seo, Soo-yeon),송세기(Song, Se-Ki) 대한건축학회 2017 大韓建築學會論文集 : 構造系 Vol.33 No.12
This paper is a study to improve the fire-resistance capacity of reinforced concrete (RC) members strengthened by fiber-reinforced-polymer (FRP). The fire resistance of the RC members strengthened by FRP was evaluated through high temperature exposure test. In order to improve the fire resistance of the FRP reinforcing method, a fire-proof board was attached to the reinforced FRP surface and then the high temperature exposure test was carried out to evaluate the improvement of the fire resistance performance. It was confirmed that the resistance to high temperature of NSMR could be improved somewhat compared with that of EBR from the experiment that exposed to high temperature under the load corresponding to 40% of nominal strength. When 30 mm thick fire-resistance (FR) board is attached to the FRP surface, the surface of the reinforced FRP does not reach 65℃, which is the glass transition temperature (GTT) of the epoxy until the external temperature reaches 480℃. In particular, when a high performance fire-proof mortar was first applied prior to FR board attachment, the FRP portion did not reach the epoxy glass transition temperature until the external temperature reached 600℃.
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