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폭발 하중에 대한 FRP 재킷 시스템이 보강된 철근콘크리트 기둥 해석 모델 개발
신지욱,Shin, Jiuk 한국공간구조학회 2021 한국공간구조학회지 Vol.21 No.2
This paper aims to develop numerical models for seismically-deficient reinforced concrete columns retrofitted using a fiber-reinforced polymer jacketing system under blast loading scenarios. To accomplish the research goal, a coupling model reproducing blast loads was developed and implemented to the column model. The column model was validated with a past experimental study, and the blast responses were compared to the numerical responses produced by past researchers. The validated modeling method was implemented to the non-retrofitted and retrofitted column models to estimate the effectiveness of the retrofit system. Based on the numerical responses, the retrofit system can significantly reduce the peak dynamic responses under a given blast loading scenario.
FRP 기둥 재킷 시스템이 보강된 지진 취약 철근콘크리트 건축물의 유한요소해석
신지욱,이상열,지동현,Shin, Jiuk,Lee, Sang-Youl,Ji, Dong-Hyun 한국공간구조학회 2021 한국공간구조학회지 Vol.21 No.2
This study develops finite element models for seismically-deficient reinforced concrete building frame retrofitted using fiber-reinforced polymer jacketing system and validates the finite element models with full-scale dynamic test for as-built and retrofitted conditions. The bond-slip effects measured from a past experimental study were modeled using one-dimensional slide line model, and the bond-slip models were implemented to the finite element models. The finite element model can predict story displacement and inter-story drift ratio with slight simulation variation compared to the measured responses from the full-scale dynamic tests.
실물 동적 실험을 통한 기존 RC 모멘트 골조에 대한 FRP 재킷시스템의 보강효과
신지욱 ( Shin Jiuk ),유영찬 ( You Young-chan ),최기선 ( Choi Kisun ),김민선 ( Kim Minsun ),이현지 ( Lee Hyunjee ) 한국구조물진단유지관리공학회 2019 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.23 No.1
This research presents effectiveness of fiber-reinforced polymer column jacketing system for a non-ductile reinforced concrete building frame constructed before the 1970s. To investigate the retrofit effects, a series of full-scale dynamic tests for the retrofitted test frame was conducted, and the dynamic responses were compared to those of the non-retrofitted test frame. The effectiveness of the retrofit system was investigated in terms of response reductions, damage mechanisms and drift concentration factors.
다양한 이력 접합부가 적용된 철골 모멘트저항골조의 내진성능평가에 대한 연구
신지욱(Shin Ji-Wook),이기학(Lee Ki-Hak),정성훈(Jeong Seong-Hoon) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.11
This paper presents the seismic performance of steel Moment Resisting Frame(MRF) buildings with various hysteretic connection models using the fragility analysis, which evaluates the probability of damage for the structural systems versus the Peak Ground Acceleration(PGA). For this study, 9-and 20-story buildings with six different hysteresis models(strength and/or stiffness degradation and brittle behavior) were used and five different fundamental periods were developed for the analytical models to evaluate the dynamic characteristics of the model buildings. The fragility curve for each damage level defined in FEMA 356 was investigated and analyzed. In order to calculate the probability of the damage for the structures subjected to the ground motions, Cumulative Distribution Function(CDF) was applied to calculate the probabilistic parameters, such as median values and standard deviation. Based on this research, it is concluded that the building with the Type A connection model, which has been widely used for the analysis were relatively conservative than other connections considered in this study. It is believed that the detailed connection models including the effects of stiffness/strength degradation and the connection types used in this study should be considered to evaluate the accurate performance of structures.