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유사동적실험의 액추에이터 제어 오차에 대한 보정 알고리즘 제안
장정현(Jang, Jeong-Hyun),최재혁(Choi, Jae-Hyouk) 대한건축학회 2017 대한건축학회 학술발표대회 논문집 Vol.37 No.2
In general, quasi-static loading test, shaking table test, and pseudo-dynamic test are the experimental methods to evaluate the seismic response characteristics of the structure. Pseudo-dynamic test is a method to examine the dynamic effect of seismic response by connecting quasi-static loading system and numerical analysis. In this pseudo-dynamic test, accurate displacement control and restoring force measurement are essential because numerical integration uses the directly measured restoring force. In this paper, a pseudo-dynamic test system with the restoring force prediction compensation method is constructed and its control accuracy is examined for SDOF test specimen.
성능스펙트럼법을 이용한 기존 학교 건축물의 내진성능평가 및 보강효과 검증
장정현 ( Jeong Hyun Jang ),황지훈 ( Ji Hoon Hwang ),양경석 ( Kyeong Seok Yang ),( Kamiya Takashi ),최재혁 ( Jae Hyouk Choi ) 조선대학교 공학기술연구원 2012 공학기술논문지 Vol.5 No.1
Large scale earthquake was occurred in different parts of the world like Japan (in 1995), Republic of Pakistan (2005), in China (2008) etc and enormous structures were damaged. As a result of collapse of school buildings structures numerous students are died and it had a big impact on the international community. Therefore, the interest of preparing the seismic resistant school building structures in our country is increases as school building are used as emergency shelter for local residents. But the current standard of seismic design ratio of 3.7% is applied for school building in Korea which is only significant earthquake damage is expected. In order to overcome the current situation, seismic performance evaluation is carried out for the existing school building and an accurate and appropriate seismic retrofit is required based on performance evaluation to upgrade the existing school buildings. In this paper, nonlinear analysis on existing school buildings for ATC-40(Applied Technology Council, ATC) and FEMA-356(Federal Emergency Management Agency, FEMA) are carried out using the capacity spectrum method to evaluate seismic performance and to determine the need for retrofitting. In addition after reinforcement to enhance the seismic performance is applied the seismic perfor-mance evaluation is carried out to verify the effectiveness of seismic retrofit.
황지훈,장정현,양경석,최재혁,Hwang, Ji-Hoon,Jang, Jeong-Hyun,Yang, Kyeong-Seok,Choi, Jae-Hyouk 한국교육시설학회 2012 敎育施設 Vol.19 No.4
Recently large scale earthquake s are occurred around the world following the damage of buildings. So the interest of preparing for earthquake seismic design and seismic performance has becoming high. School buildings are though used for educational purpose; they are also used as emergency shelter for local residents during earthquake disaster. However, the current seismic design ratio of our country (Korea) is 3.7% and if massive earthquake is occurred it follows a serious damage. In order to overcome this situation, seismic performance evaluation is carried out for existing school building and an accurate and appropriate seismic retrofit is required based on performance evaluation to upgrade the existing school buildings. In this paper, nonlinear static analysis on existing school buildings for ATC-40 and FEMA-356 are carried out using the capacity spectrum method to evaluate seismic performance and to determine the need for retrofitting. In addition, after reinforcement to verify the effect of retrofit enhance the seismic performance is applied the seismic performance evaluation is carried out to verify the effect of seismic retrofit time history analysis using nonlinear dynamic analysis is also performed and nonlinear behavior of earthquake load of seismic retrofit of structures was also investigated.
천마 침출약용주의 만성적인 섭취가 뇌 조직에서 항산화력에 미치는 영향
윤인정(In-Jeong Yun),공현주(Hyun-Joo Kong),장정현(Jung-Hyeon Jang),양경미(Kyung-Mi Yang) 동아시아식생활학회 2016 동아시아식생활학회지 Vol.26 No.6
This experiment was conducted to verify whether or not chronic consumption of liquor prepared with Gastrodiae rhizoma exhibits antioxidant activity in brain tissue of rats. In the experiment, male Sprague-Dawley rats were given a liquid diet containing 6% (GA6), 18% (GA18), and 36% (GA36) of total calories as liquor for 6 weeks. The control rats (GAC6, GAC18, GAC36) received an isocaloric diet containing Soju instead of liquor. Caloric intakes and body weight gains of the 36% groups were significantly lower than those of the 6% and 18% groups (p<0.05), whereas alcohol intakes were significantly high in the 36% group (p<0.05). MDA contents of plasma and brain showed a positive correlation with alcohol intakes of the liquor and Soju consuming groups. Especially, contents of MDA were significantly higher in the 18% and 36% groups than the 6% group (p<0.05). SOD activities of serum and brain were significantly highest in the 18% group, and they tended to be higher in the liquor consuming groups compared with the control group. Catalase activity of serum showed no significant changes in the three groups consuming liquor, and catalase activity of brain tissue significantly increased in the GA18 group compared with the control group (p<0.05). In the liquor consuming groups, TAC level of serum tended to be higher in the GA36 group compared with the control group (p<0.05). However, TAC level of brain tissue showed no significant changes between the liquor consuming and control groups. These results show that as alcohol intake increased by chronic administration of liquor and Soju, brain tissue of rats was damaged more due to oxidative stress. However, a liquid diet containing 18% of total calories as liquor instead of Soju is expected to have a protective effect on brain damage induced by oxidative stress.
황지훈(Hwang, Ji-Hoon),장정현(Jang, Jeong-Hyun),양경석(Yang, Kyeong-Seok),최재혁(Choi, Jae-Hyouk) 한국교육시설학회 2012 敎育施設 Vol.19 No.4
Recently large scale earthquake s are occurred around the world following the damage of buildings. So the interest of preparing for earthquake seismic design and seismic performance has becoming high. School buildings are though used for educational purpose; they are also used as emergency shelter for local residents during earthquake disaster. However, the current seismic design ratio of our country (Korea) is 3.7% and if massive earthquake is occurred it follows a serious damage. In order to overcome this situation, seismic performance evaluation is carried out for existing school building and an accurate and appropriate seismic retrofit is required based on performance evaluation to upgrade the existing school buildings. In this paper, nonlinear static analysis on existing school buildings for ATC-40 and FEMA-356 are carried out using the capacity spectrum method to evaluate seismic performance and to determine the need for retrofitting. In addition, after reinforcement to verify the effect of retrofit enhance the seismic performance is applied the seismic performance evaluation is carried out to verify the effect of seismic retrofit time history analysis using nonlinear dynamic analysis is also performed and nonlinear behavior of earthquake load of seismic retrofit of structures was also investigated.
최승우(Choi, Seung-Woo),장정현(Jang, Jeong-Hyun),이종희(Lee, Jong-Hui),현창협(Hyeon, Chang-Hyeop),심재일(Sim, Jae-Il),최재혁(Choi, Jae-Hyouk) 대한건축학회 2017 대한건축학회 학술발표대회 논문집 Vol.37 No.2
In order to examine hysteresis behavior of the brace-type frictional damper, cyclic loading test were carried out. The brace-type friction damper consists of a brace part and a friction damper part to prevent buckling occurring in the brace structure. In the test of the amplitude input waveform, the friction dampers showed stable hysteresis behavior from the 1-cycle to the last 15-cycle, and sufficient energy dissipation occurred. It has been shown that a constant level of frictional strength is secured during three times of the cyclic loading test in the incremental amplitude input waveform and the brace type friction damper can be reused only by replacing the friction material after the earthquake.