• Structural Engineering and Mechanics
• /
• 제91권4호
• /
• pp.369-382
• /
• 2024

The earthquake loss assessment framework of ductile reinforced concrete (or RC) frame using component-performance -based methodology was studied in this paper. The elasto-plastic rotation angle was used as the damage indicator of structural component, and the damage-to-loss model was proposed on the basis of the deformation indicator of structural component. Dynamic instability during incremental dynamic analysis was taken as collapse criterion, and column failure was taken as criterion that structure has to be demolished. Expected earthquake losses of low-rise, mid-rise and high-rise RC frames were discussed. The expected earthquake loss encompassed collapse loss, demolition loss and repair loss. Furthermore, component groups of RC frame were divided into structural components, nonstructural components and rugged components. The results indicate that ductile RC frame is more likely to be demolished than collapse, especially in low-rise and mid-rise RC frames. Furthermore, the less collapse margin ratio the structure has, the more demolition probability the structure will suffer under rare earthquake. The demolition share of total earthquake loss might be more prominent than repair share and collapse share in ductile RC frame.

• 한국지진공학회:학술대회논문집
• /
• 한국지진공학회 2000년도 춘계 학술발표회 논문집 Proceedings of EESK Conference-Spring
• /
• pp.341-348
• /
• 2000

The existing solid circular RC pier without seismic detailing is found to have poor ductility due to the premature bond failure of lap spliced longitudinal bars. The steel-jacket was introduced to prevent this unexpected type of failure. The nonlinear behavior and he seismic performance of the retrofitted pier were examined through the scale model test and compared with those of existing one. It is confirmed from the test results that the steel-jacket retrofitting can be used as an measure to improve seismic performance considerably.

• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 2001년도 가을 학술발표회 논문집
• /
• pp.453-458
• /
• 2001

This paper presents the procedure to find the hysteresis loop of RC member using a modified strut-and-tie model. The forces and displacements at critical points, that are initial yielding point, target displacement point, unloading elastic limit, and reloading point after pinching, are investigated with the strut-and-tie models. Using bond-slip relationship, the elastic behavior of tie element is determined. The plastic flow behavior after flexural yielding is expressed by changing the location of longitudinal strut. Determination of pinching effect completes the initial hysteresis loop, assuming that the behavior of the opposite direction is symmetrical form.

• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 2001년도 가을 학술발표회 논문집
• /
• pp.459-464
• /
• 2001

A great level of strength and deformability on compressive zone of RC wall is essentially required when subjected to high axial and in-plane lateral loading due to earthquakes. One of the best ways to handle this situation is to provide the confinement effectiveness to the compressive zone by reinforcing steel. For this a series of design charts were constructed to evaluate the confinement effectiveness for a given steel configuration in accordance with a well-known model and part of them are presented in this paper. Using the chart, designers can choose a desirable steel arrangement in flexural compressive zone of RC walls for a prescribed confinement factor.

• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 2004년도 춘계 학술발표회 제16권1호
• /
• pp.252-255
• /
• 2004

The measured longitudinal reinforcement tensions in the shear-critical RC beams were significantly higher than the calculated values by the beam theory. This may be attributed to the reduction of the internal-moment arm length by the development of the arch action. In this paper, the measured longitudinal reinforcement tensions in the test performed by $Kim^4$ were compared with those predicted by the various truss model.

• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 2003년도 가을 학술발표회 논문집
• /
• pp.388-391
• /
• 2003

In this study, the experimental results were simulated by using a nonlinear analysis programs IDARC 2D and RUAUMOKO 2D. These programs use a global Takeda-like model. The objectives of this study is to verify the correlation between the experimental and analytical responses of reinforced concrete (RC) frame and to provide the calibration to the available static inelastic analysis techniques. The evaluation of the accuracy of analytical simulation by IDARC 2D and RUAUMOKO 2D leads to the conclusion that the global behaviors can be, in general, simulated with limited accuracy in the linear analysis as detailing.

• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 2006년도 추계 학술발표회 논문집
• /
• pp.265-268
• /
• 2006

Recently, many design standards recommend the use of a strut-tie model approach for design of structural concrete with D-region(s). However, since the design standards of the conventional strut-tie model approaches are suggested on the assumption of using a determinate strut-tie model, it is difficult to apply an indeterminate strut-tie model in the design of continuous deep beams. In this study, an indeterminate strut-tie model for continuous deep beams is proposed to resolve the problem, and the ultimate strengths of 35 continuous deep beams tested to failure are evaluated for the validity check of the proposed indeterminate strut-tie model. The analytical results by the proposed model are compared with those by the conventional approaches of ACI 318-99 and ACI 318-05.

• 한국전산구조공학회논문집
• /
• 제24권6호
• /
• pp.617-627
• /
• 2011

본 논문은 기 수행된 1:5축소 10층 RC 공동주택의 지진모의 실험결과에 비추어 근래 개발된 PERFORM-3D를 이용하여 해석적 모사를 시도하였다. 해석과 실험의 상관관계 분석에 의해 다음과 같은 결론을 얻었다. (1) 재현주기 50년 지진에 대해 실험과 해석이 매우 유사한 탄성거동을 보였다. 반면 우리나라의 설계지진과 최대지진에 대해서는 비선형 거동을 보이긴 하지만 실험의 최대응답과 강성 및 강도 저하를 제대로 모사하지 못하였다. 이의 주된 이유는 슬라브 거동을 탄성으로 가정하였기 때문이라고 판단된다. (2) 탄성영역 거동에 대해 해석모델이 전체 거동을 비교적 잘 모사하는 반면, 벽체 상호간에 걸친 힘의 분포에 있어서 실험과 상당한 차이를 보여주었다. (3) 최대지진에서 벽체의 전단변형은 비교적 잘 모사한 반면 휨변형의 경우 10배정도 과장되었다. 이는 일부 해석모델에서 인방보를 무시한 결과로 추정된다.

• 한국공간구조학회논문집
• /
• 제5권2호
• /
• pp.89-97
• /
• 2005

건축 구조물이 초고층화, 대형화, 특수화 되어감에 따라 고강도 재료의 사용이 증대되고 있으며, 고강도 재료가 사용된 철근콘크리트 보의 전단강도를 타당하게 예측할 수 있는 해석모델이 반드시 필요하다. 본 연구에서는 고강도 철근이 사용된 철근콘크리트 보의 전단강도를 타당하게 예측할 수 있는 트러스 모델을 제안한다. 고강도 철근이 사용된 철근콘크리트 보의 전단강도에 대한 제안된 모델인 TATM의 타당성을 검토하기 위하여 총 107개 보의 실험결과를 수집하였으며, TATM 및 기존 트러스 모델의 전단강도 해석결과를 이들 실험결과와 비교하였다. 비교 결과, TATM은 다른 트러스 모델보다 실험결과를 더 잘 예측하였으며, TATM의 해석결과에 대한 실험결과의 비는 인장철근과 전단 철근의 항복강도에 거의 관계없이 일정하였다.

• Structural Engineering and Mechanics
• /
• 제24권5호
• /
• pp.601-620
• /
• 2006

The paper presents an effective stiffness model for deformational analysis of reinforced concrete cracked members in bending throughout the short-term loading up to the near failure. The method generally involves the analytical derivation of an effective moment of inertia based on the smeared crack technique. The method, in a simplified way, enables us to take into account the non linear properties of concrete, the effects of cracking and tension stiffening. A statistical analysis has shown that proposed technique is of adequate accuracy of calculated and experimental deflections data provided for beams with small, average and normal reinforcement ratios.