• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 2005년도 추계 학술발표회 제17권2호
• /
• pp.73-76
• /
• 2005

This paper discussed finite element method(FEM) models of the reinforced concrete frame retrofitted with cast-in plate infilled shear wall and analysed under constant axial and monotonic lateral load using ABAQUS. Detailed finite element models are created by studying the monotonic load response of the designed connection of reinforced concrete frame and cast-in plate infilled shear wall. The developed models account for the effect of material inelasticity, concrete cracking, geometric nonlinearity and bond-slip of steel, frame and infilled shear wall. In order to verify the proposed FEM, this study behaved analysis considered a diagonal reinforced steel. The analytical results compared with the experimental results.

• 한국지반공학회:학술대회논문집
• /
• 한국지반공학회 2000년도 가을 학술발표회 논문집
• /
• pp.101-108
• /
• 2000

This paper presents the results of finite element analysis on the seismic response of a soil-reinforced segmental retaining wall subjected to a prescribed earthquake record. The results of finite element analysis indicate that the maximum wall displacement occurs at the top, exhibiting a cantilever type of wall movement. Also revealed is that the increase in reinforcement force is more pronounced in the upper part of the reinforced zone, resulting in a more or less uniform distribution. None of the design guidelines appears to be able to correctly predict the dynamic force increase when compared with the results of finite element analysis. The results demonstrated that there exist critical stiffness and length of reinforcement beyond which further increase would not contribute to additional reinforcing effect. Based on the findings from this study, a number of implications to the current design methods are discussed.

• 한국농공학회:학술대회논문집
• /
• 한국농공학회 1999년도 Proceedings of the 1999 Annual Conference The Korean Society of Agricutural Engineers
• /
• pp.638-644
• /
• 1999

The objectives of the study are to investigate thermal conductivity(TC) and coefficient of thermal transmission (CTT) according to the type of soils, the presence of reinforceemnt, temperature, relative humidity and to analyze experimentally the characteristics of thermal transfer of reinforced soil wall. Results are summarized as follows ; 1) Clayey soil has high value of TC and CTT than sandy soil. 2) TC and CTT of reinforced soil wall is about 6∼17% higher than those of reinforced one, 3) It is founded that the effect of relative humidity on the soil wall is important at the same temperature and 4) As the temperature is high, it is appeared that TC and CTT are high.

• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 2004년도 추계 학술발표회 제16권2호
• /
• pp.453-456
• /
• 2004

RC frames built prior to the advent of the philosophy of ductile concrete is one type of existing construction susceptible to damage. Strengthening and stiffening of such frames has been accomplished by infilled frames with cast-in-place, reinforced concrete walls. Placement of CIP shear walls within strategic bays of a structure appears to be a logical and economical method to strengthen a reinforced concrete frame and to stiffen a building in order to reduce architectural and mechanical damage. This study investigates the seismic performance of cast-in place infilled shear wall within existing frames. The object of this study is to clarify the seismic capacity and characteristics in the hysteretic behavior of bare frame, CIP infilled shear wall and CIP infilled wall reinforced diagonal bars.

• Steel and Composite Structures
• /
• 제28권5호
• /
• pp.527-539
• /
• 2018

The use of reinforced concrete (RC) shear wall with concrete filled steel tube (CFST) columns and steel fiber reinforced concrete (SFRC) shear wall has aroused widespread attention in recent years. A new shear wall, named SFRC shear wall with CFST columns, is proposed in this paper, which makes use of CFST column and SFRC shear wall. Six SFRC shear wall with CFST columns specimens were tested under cyclic loading. The effects of test parameters including steel fiber volume fraction and concrete strength on the failure mode, strength, ductility, rigidity and dissipated energy of shear wall specimens were investigated. The results showed that all tested shear wall specimens exhibited a distinct shear failure mode. Steel fibers could effectively control the crack width and improve the distribution of cracks. The load carrying and energy dissipation capacities of specimens increased with the increase of steel fiber volume fraction and concrete strength, whilst the ductility of specimens increased with the increase of steel fiber volume fraction and the decrease of concrete strength.

• 한국지반공학회지:지반
• /
• 제14권5호
• /
• pp.67-76
• /
• 1998

본 연구에서는 보강토 구조물에 이용되는 지오그리드와 국내에 많이 분포하고 있는 화강풍화토를 대상으로 하여, 보강재의 포설깊이가 동일한 상태에서 보강재의 길이를 벽체높이의 0.465배, 0.685배, 0.9배로 설치하여 보강재가 전면벽체에 정착된 경우와 비정착된 경우에 대하여 모형실험을 실시하였다. 모형실험결과, 정착된 경우에는 보강재의 길이가 증가함에 따라 지지력은 무보강인 경우 보다 약 1.725~2.1배 증가함을 알 수 있었으며, 침하량도 약 20%이상의 감소율을 보였다. 전면 벽체의 최대 수평변위량은 무보강에 비해 약 80%이상의 감소율을 보였다. 비정착된 경우에도 무보 강인 경우보다 지지력이 약 1.7배이상 증가하였으며, 전면벽체의 최대 수평변위는 약 50%이상 감소하였다. 모형실험을 통해 고찰한 파괴면은 Bchlosser 등(1979)의 연구결과와 유사하게 나타났다.

• 한국지반환경공학회 논문집
• /
• 제4권1호
• /
• pp.11-17
• /
• 2003

기존의 지오텍스타일 보강토벽 공법은 대부분 콘크리트 판넬 또는 블록형식의 벽면을 사용하고 있어 미관상의 단점을 해결하지 못하고 있다. 이러한 보강토 사면 또는 보강토벽의 단점을 보완하여 녹화벽면의 형성이 가능할 경우 기존 보강토 공법의 장점이 극대화되어 이 공법의 효율성을 크게 향상시킬 수 있다. 이와 같은 배경 하에 본 연구에서는 보강토벽 전면에 녹화가 가능한 연성벽면을 형성, 안정성 측면에서도 강성벽면과 거의 동등한 기능을 발휘할 수 있는 공법을 고안하여, 여러 가지 형태의 실내모형 시험을 실시하여 그 거동을 비교 분석하였다. 그 결과, 이러한 녹화벽면 공법은 그 안정성측면에서도 충분히 새로운 공법이 될 수 있을 것으로 판단된다.

• Advances in concrete construction
• /
• 제8권2호
• /
• pp.77-90
• /
• 2019

This paper aims to investigate vibration frequency decrease (vibration period elongation) of reinforced concrete (RC) structure with unreinforced infill wall and reinforced infill wall exposed to progressively increased artificial earthquake load on shaking table. For this purpose, two shaking table experiments were selected as a case study. Shaking table experiments were carried on 1:1 scaled prototype one bay one storey RC structure with infill walls. The purpose of this shaking table experiment sequence is to assess local behavior and progressive collapse mechanism. Frequency decrease and eigen-vector evolution are directly related to in-plane and out-of-plane bearing capacities of infill wall enclosure with reinforced concrete frame. Firstly, frequency decrease-damage relationship was evaluated on the base of experiment results. Then, frequency decrease and stiffness degradation were evaluated with applied Peak Ground Acceleration (PGA) by considering strength deterioration. Lastly, eigenvector evolution-local damage and eigenvector evolution-frequency decrease relationship was investigated. Five modes were considered while evaluating damage and frequency decrease of the tested specimens. The relationship between frequency decrease, stiffness degradation and damage level were presented while comparing with Unreinforced Brick Infill (URB) and Reinforced Infill wall with Bed Joint Reinforcement (BJR) on the base of natural vibration frequency.

• 한국안전학회지
• /
• 제37권6호
• /
• pp.81-88
• /
• 2022

It is necessary to better understand the effect of age-related degradation on the performance of reinforced concrete shear walls in nuclear power plants in order to ensure their structural safety in the event of earthquakes. Therefore, this paper studies seismic fragility of the typical shear wall in nuclear power plants under earthquake excitation Reinforced concrete shear wall is composed of wall, horizontal and vertical flanges. Due to characteristics of its geometry, it is difficult to predict the ultimate behavior of shear wall under earthquake excitation. In this study, for more realistic numerical simulation, the Latin Hyper-Cube (LHC) simulation technique was used to generate uncertain variables for the material properties of concrete shear walls. The effects of crack, characteristics of inelastic behavior of concrete, and loss of cross section were considered in the nonlinear finite element analysis. The effects of aging-related deterioration were investigated on the performance of reinforced concrete shear walls through analysis of undegraded concrete shear walls and degraded concrete shear walls. The resulting seismic fragility curves present the change of performance of concrete shear wall due to age-related degradation.

• 한국지반공학회:학술대회논문집
• /
• 한국지반공학회 1997년도 가을 학술발표회 논문집
• /
• pp.325-332
• /
• 1997