• 한국공간구조학회논문집
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• 제8권4호
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• pp.73-80
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• 2008

본 논문의 목적은, LQR 제어이득의 효율적 산정에 의한 지진하중을 받는 빌딩 구조물의 능동지진제어를 위하여 능동텐던 장치를 적용한 구조물의 지진응답제어를 위한 최적화 방법을 제시한 것이다. 텐던을 이용한 구조물 지진응답제어 문제의 정식화를 위해 Ricatti 폐회로 제어이론 및 위상보정에 의한 시간지연현상을 도입하였으며, 상태방정식의 해를 산정하기 위해 전달 행렬을 이용한 수치해석법을 이용 사다리꼴적분법에 의해 상태벡터의 해를 산정하였다. 성능지수의 최적화를 위해, 최소 가중행렬비를 설계변수로, IBC 2000의 허용층간변위 규정과 텐던의 최대제어력을 제약조건으로 하여, SUMT 기법에 의해 최적 해를 산정토록 최적제어 프로그램을 개발하였다. 8층 빌딩구조물에 대한 적용 예에서, 최적제어를 적용한 시스템이 비제어 시스템에 비해 층간제어효과가 우수하고, 일정 가중행렬비 적용 제어시스템에 비해 낮은 성능지수가 요구되었다.

• 한국지진공학회논문집
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• 제3권2호
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• pp.55-66
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• 1999

본 연구는 철도, 도시고속화도로 및 고속도로 교량의 교각으로 많이 이용디고 있는 철근콘크리트 기둥으 내진성능 평가에 관한 quasi-static 실험으로서 사용된 실험 변수는 축하중 내진설계유무에 따른 띠철근량 변위제어 하중형태 등을 채택하였다 RC 기둥시험체는 수원에 위치한 하갈교의 교각을 1/3.4의 축소모델로 하여 내진설계된 단면과 내진설계되지 않은 시험체를 각각 4개씩 총 8개를 제작하였으며 소성힌지구간에서 띠철근의 간격은 2.2cm 및 4.4cm 이다 실험변수에 따른 내진 및 비내진 시험체의 내진성능검토를 위하여 충진콘크리트 교각의 하중변위 이력특성 연성능력, 강도감소, 에너지 흡수능력, 등가점성계수 등을 실험적으로 분석조사하였다. '96년 개정된 도로교시방서의 RC기둥에 관한 내진설계기준은 AASHTO(1992)와 유사한 것으로서 중.약지진 지역으로 구분되는 국내의 실정에는 다소 과다설계로 판단된다. 실험결과 비내진설계된 콘크리트 교각도 어느 정도의 연성능력을 발휘한 것으로 조사되었으나 추가의 충분한 실험연구가 요구된다. 그러나 비내진설계교각도 적절한 내진보강방안을 강구한다면 우수한 내진성능을 발휘할수 있으리라판단된다.

• 한국구조물진단유지관리공학회 논문집
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• 제8권2호
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• pp.221-230
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• 2004

본 논문에서는 지진하중 작용시, 점탄성 감쇠기 및 면진장치를 설치한 다층 철골 모멘트 저항 골조의 동적응답을 해석적으로 규명하였다. 본 연구의 목적은 구조해석을 수행하여 최대 층간변위 및 최대응력법에 의해 효율적인 점탄성 감쇠기의 위치를 결정하는 것이다. 또한, 효율적인 진동 제어방법을 모색하기 위하여 점탄성 감쇠기 및 납삽입고무베어링형 면진장치에 의한 제어효과를 부재력, 조합응력, 그리고 구조물의 고유주기 등을 이용하여 상호 비교 분석하였다.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2001년도 가을 학술발표회 논문집
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• pp.185-190
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• 2001

The severe shortage of the available sites in the highly developed downtown area in Korea necessitates the construction of high-rise buildings which meet the need of residence and commercial activity simultaneously. The objective of this study is to investigate the seismic performance of this type of building structures. For this purpose, two 1:12 scale 17-story reinforced concrete model structures were constructed according to the similitude law, in which the upper 15 stories have a bearing-wall system while the lower 2-story frames with infilled shear wall have two different layouts of the plan : The one has symmetric plan and the other has unsymmetric plan. Then, this model was subjected to a series of earthquake excitations. The test results show that the layout of shear wall has the negligible effect on the natural period and the base shear coefficient, but great effect on the failure mode of beam-column joint at flexible side frame.

• 한국지진공학회:학술대회논문집
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• 한국지진공학회 2001년도 추계 학술발표회 논문집 Proceedings of EESK Conference-Fall 2001
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• pp.407-414
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• 2001

The severe shortage of the available sites in the highly developed downtown area in Korea necessitates the construction of high-rise buildings which meet the need of residence and commercial activity simultaneously. The objective of this study is to investigate the seismic performance of this type of building structures. For this purpose, two 1 :12 scale 17-story reinforced concrete model structures were constructed according to the similitude law, in which the upper 15 stories have a bearing-wall system while the lower 2-story frames have two different layouts of the plan The one is a moment-resisting frame system and the other is a moment-resisting frame system with a infilled shear wall. Then, this model was subjected to a series of earthquake excitations. The test results show that the existence of shear wall reduced the shear deformation at the piloti frame, but has almost the negligible effect on the reduction of the overturning-moment angle.

• 한국지진공학회:학술대회논문집
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• 한국지진공학회 2002년도 추계 학술발표회 논문집
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• pp.197-204
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• 2002

The resent earthquakes in worldwide have caused extensive damage to highway reinforced concrete bridge piers. It has been observed in the Korean Peninsula that the number of minor or low earthquake motions have increased year by year. Since the concern about the earthquake hazards is increased, the objective of this research is to evaluate the damage of reinforced concrete bridge piers subjected to probable earthquake motions. Experimental investigation was conducted to study the seismic performance of the full-scale specimens in size D=1.2m H=4.8m, which were constructed with different longitudinal lap splice and loading pattern, through the quasi-static test and the pseudo-dynamic test. It is thought that this result could contribute to establish the retrofit decision-making and disaster planning of reinforced concrete bridge piers in earthquake regions. And it could be also possible to quantify the damage of reinforced concrete bridge piers under cyclic loading

• 한국지진공학회:학술대회논문집
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• 한국지진공학회 2005년도 학술발표회 논문집
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• pp.169-176
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• 2005

Many RC building structures of multiple uses constructed in Korea have the irregularities of torsion and soft story at bottom stories. A typical irregular building was selected as prototype and shaking table tests were performed to investigate the seismic performance of this building. The objective of this study is to evaluate the correlation between the experimental and analytical responses of this irregular building structure subjected to the earthquake excitation by using OpenSees(Open System for Earthquake Engineering Simulation). The results of analyses simulate well the effect of axial forces on the shear force of column and axial deformation. However, some discrepancy between analytical and experimental results in the distribution of shear forces and overturning deformation were observed.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1998년도 가을 학술발표대회 논문집(III)
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• pp.615-620
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• 1998

The objective of this experimental study is to investigate the hysteretic behavior of reinforced concrete piers subjected to quasi-static cyclic loads, which have been used in large numbers for railway and urban transportation facilities. Important test parameters are hoop ratio, axial load, loading type, and the behaviors f members have been evaluated through limit states of crack occurrence, yielding and ultimate state of member, ductility and load-deflection loop can be secured by considering the influence of hoop reinforcement ratio and axial load, and that plastic hinge length and ductility ar determined by the combination of the quantities of hoop reinforcement and axial load.

• 한국지진공학회논문집
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• 제20권6호
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• pp.361-368
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• 2016

Coupling beams serve as primary source of energy dissipation in coupled shear wall systems during large earthquakes. However, the overestimation of the shear strength of diagonally reinforced coupling beams may be adverse effect on the seismic performance of coupled shear wall systems. In order to force coupling beams to properly work during earthquakes, coupling beams should be designed with accurate shear strength equations. The objective of this study is to propose the accurate shear strength equation for slender diagonally reinforced coupling beams. For this purpose, experimental tests were conducted using three diagonally reinforced coupling specimens with different amount of transverse reinforcement under reversed cyclic loads to evaluate the hysteretic behavior of the specimens. The test results show that transverse reinforcement of slender diagonally reinforced coupling beam affects the maximum strength and drift ratio.

• 한국지진공학회:학술대회논문집
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• 한국지진공학회 2003년도 추계 학술발표회논문집
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• pp.205-212
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• 2003

To evaluate the seismic performance of multistory building structures use an equivalent SDOF model. This paper presents a method of converting a MDOF system into an equivalent SDOF model. The principal objective of this investigation is to evaluate appropriateness of converting method through perform nonlinear time history analysis of a multistory building structures and an equivalent SDOF model. The hysteresis rules to be used an equivalent SDOF model is obtained from the pushover analysis. The conclusion of this study is following; A method of converting a MDOF system into an equivalent SDOF model through the nonlinear time history response analysis is valid. The representative lateral displacement of a moment resisting reinforced concrete frames is close to the height of the first modal participation vector $_1$$\beta$｛$_1$u｝=1. It can be found that the hysteresis rule of an equivalent SDOF model have influence on the time history response. Therefore, it is necessary for selecting hysteresis rules to consider hysteresis characteristics of a moment resisting reinforced concrete frames.