Reinforced concrete coupled shear wall systems in medium and high-rise construction, where RC beams couple two or more RC walls have been frequently used. The objective of this study is to investigate seismic behavior of coupled shear wall according to the replacement ratio of headed-bar.

Hybrid coupled shear wall with steel coupling beam has often been used to resisting system of earthquake load and transverse load. This study addresses the strain characteristics of coupling beam in hybrid wall system.

This experimental study examines the test results on the flexural behavior of strain-hardening cement composite (SHCC) with two types of Shrinkage Reducing Admixture (SRA). An influence of SRA on the flexural behaviors of SHCC mixes was observed.

This paper describes evaluaties the mechanical characteristics of high strength steel fiber-reinforced concrete(SFRC) with maximum size of coarse aggregate. The test variables such as aggregate maximum size(8, 13, 20mm) and steel fiber volume faction(0, 1.5%). The test results indicate, SFRC of smaller aggregate size is expected to prvention of brittle fracture and promote of compression toughness.

As the scale of structure becomes larger, the temperature crack of massive concrete structure is caused by the phenomenon which the mass concrete volume is restricted in the inside or outside part due to the temperature variations induced by the hydration heat of cement. So, we should prepare the method to reduce reasonably the hydration heat for the control of temperature crack. Therefore, this study presents the hydration heat analysis to verify the control effect of temperature crack when we consider to the different concrete mixtures.

This paper present results from effect of fiber volume fraction on direct shear property of steel fiber reinforced concrete(SFRC). Steel fiber with crimped end was used this work. Principal variable is fiber volume fraction; 0, 0.5, 1, 1.5, 2%, and aggregate size; 8, 13, 20mm. Specimen cross-sectional is 100 x 100 x 400mm. In order to induce the shear failure 2mm notch was sawed all around the specimen. Test result, there are little different between the aggregate size, and the improvements in shear strength of SFRC were more significant for 1% steel fiber volume fraction.

This study is to evaluate structural strengthening performance of lightly reinforced concrete frame retrofitted with infill wall experimentally. In order to evaluate the performance concrete and SFRC infill walls. The weariable is presence of fiber and the wall panel is 1/3 scale models. The result of this study, the SFRC wall specimen, the maximum load and displacement go increase than concrete wall.

Reinforced concrete coupled shear wall systems in medium and high-rise construction, where RC beams couple two or more RC walls have been frequently used. The objective of this study is to investigate seismic performance of coupling beam with headed bar.

Coupling beams of coupled shear wall systems are often the most critical members in medium or high rise buildings subject to seismic load or wind loads. To ensure the survival of shear walls under high-intensity cyclic loading, these beams, which normally have limited dimensions, should possess high deformability and good energy absorption while being able to resist large shear force. Experimental work are conducted to illustrate the design of special RC coupling beams using the proposed procedure reinforcement details.

The coupling beams provide transfer of vertical forces between adjacent shear walls in coupled shear wall system, which creates a frame-like coupling action that resists lots of the total overturning moment induced by the wind load or seismic load. The purpose of this study is to investigate the strain characteristics performance of coupling beams with headed bar.

복합 병렬 전단벽(Coupled shear walls)은 커플링 보와 철근콘크리트 벽체로 구성되어 바람이나 지진 등의 횡하중으로부터 유발된 전도모멘트의 상당 부분을 철골 연결보의 커플링 작용에 의하여 골조 작용(Frame action)을 의하여 횡력에 효율적으로 저항하게 된다. 본 연구에서는 접합부 상세에 따른 복합병렬 전단벽의 접합부 강도에 대한 규준식을 정립하기 위한 선행연구로서 병렬 전단벽 접합부에서 커플링 보의 매립길이 및 벽체 두께를 주변수로 실험적 연구를 수행하여 접합부 상세에 따른 복합 병렬 전단벽 시스템의 거동특성을 규명하고자 하였다. 본 실험결과, 실험체의 거동 및 내력은 매립길이 및 접합부 상세에 많은 영향을 받는 것으로 나타났으며 향후 설계시 이에 대한 영향을 반영해야 할 것으로 판단된다.

바이오매스에서 얻어지는 바이오차는 토질 개량제와 탄소 격리제로 제한적인 분야에서 성공적으로 사용되고 있다. 현재 산업전반에서 CO2 에 의한 환경에 부정적인 영향을 완화시키고 지속가능성을 증진시키기 위한 연구가 활발히 진행되고 있다. 이에 본 연구에서는 고탄소 바이오차를 탄소 격리제 또는 시멘트의 혼화재로써 활용 가능성을 평가하고자 하였다. 견목재에서 얻어진 바이오차를 혼화재로 사용하여 시멘트 배합조건을 달리하면서 모타르의 압축강도, 마이크로구조, 압축강도, 유동성, 중량감소와 같은 화학적, 물리적 재료성질을 평가하였다. 또한 플리이애쉬를 사용한 모르타르의 역학적 특성과 비교 평가하였다.

To evaluate seismic performance of existing school buildings, This study performed pushover analysis using Midas/Gen Ver.795. The outcome shows that building have insufficient seismic performance and seismic reinforcement is necessary to have enough seismic performance.

This paper describes the structural behavior of insulated concrete wall panels with no-bond stress insulation. That panels reinforced with fiber reinforced polymer (FRP) truss shear connector to achieve composite action of inner and outer concrete wythes. Main test variable is bond stress. According to the test result, the shear capacity of increased due to bond stress and reinforced with FRP truss shear connector.

This paper describes the structural behavior of insulated concrete wall panels with EPS insulation. That panels reinforced with Fiber Reinforced Polymer (FRP) truss shear connector to achieve composite action of inner and outer concrete wythes. Main test variables are FRP cross section, width and picth. According to the test result, the shear capacity of increased due to reinforced with FRP truss shear connector. And width 12, 18 mm shear connector need more than 30 mm experiments about reclamation deep.

This study was shear strength of insulated concrete sandwich panels with tress shear connector. Specimens with results XPSSTG insulation than the EPS insulation was good in the Shear Strength. The maximum displacement is better than the EPS specimens and that of the specimens XPSSTG trends that appear are considered.

This experimental study evaluates of seismic performance on strain-hardening cement-based composite (SHCC). The objective of this study is to evaluate of cross-sectional reduction (1400×800×70 and 1120×520×40㎜) and design compressive strength level (45 and 50 MPa). The experimental results as cross-sectional reduction, peak loads are not significantly different. but energy area is decrease.

This paper is about flexural performance of shotcreting SHCC according to stages. The study results showed that shotcrete SHCC is possible to connection of reinforced concrete frame and retrofitted member.

The objective of this study is to investigate the behavior and strain characteristics of steel coupling beam-wall connection. Test variable of this study is embedment length of steel coupling beam in the embedment region. The results showed that Specimens PSH2C-ST and PSH2C-ST experienced bearing failure, based on the observation of strain of concrete in the embedment region.

This paper investigates The purpose of this research was to investigate the effects of expansive admixture on the tension stiffening performance and cracking process of SHCC with polyethylene(PE) fiber. Testing was carried out on four axially loaded tension tie specimens. Each specimen had a square cross-section dimension 100 × 100mm of and length of 1200mm. As a result, using an expansion admixture can improve a prestress and reduce an initial shrinkage crack.