본 연구에서는 기존 철근콘크리트 건물의 보-기둥 접합부의 내진성능의 개선을 위해 보-기둥 접합부 영역을 FRP보강재(매입형 CFRP Rod, CFRP시트)를 사용하여 보강한 후 내진성능을 평가하였다. 총 6개의 실험체를 제작하고 실험을 수행하여 내진성능을 평가하였으며, 본 연구의 실험결과를 근거로 다음과 같은 결론을 얻었다. 기존 철근콘크리트 보-기둥 접합부의 접합부 영역을 보강한 결과, 초기 재하시 접합부 영역의 균열억제 효과와 재하 전 과정을 통하여 보강재의 구속효과로 인하여 균열억제 효과가 커서 안정적인 파괴형태 및 내력향상 효과를 나타내었다. 매입형 CFRP Rod와 CFRP시트를 활용한 RC 외부 보-기둥 접합부 실험체 RBCJ-SRC2는 표준실험체 RBCJ와 비교하여 변위연성4, 7에서 각각 최대 내력은 1.97배, 에너지소산능력은 2.08배 증가하였다. 또한, 실험체 RBCJ-SR시리즈와 비교하여 최대내력이 1.09~1.11배 증가하였다. 그리고 실험체 RBCJ-CS, RBCJ-SR시리즈, RBCJ-SRC2는 변위연성 5, 6에서 표준실험체 RBCJ 보다 에너지소산능력이 1.10~2.30배 증가하였다. 그리고 에너지소산능력은 변위연성 4에서 13.0~14.4% 증가하였다.

In this study, experimental research was carried out to improve and evaluate the seismic performance of reinforced concrete beam-column joint using Groove and Embedding FRP Rod and CFRP Sheet in existing reinforced concrete building. Test result shows that retrofitting specimen(RBCJ-SR2, SRCB2) designed by the improvement of seismic performance of reinforced concrete beam-column joints load-carrying capacities were increased 1.78 ~ 2.29 times in comparison with the standard specimen.

In this paper, the seismic performance of RC frame with deterioration of structural capacity was evaluated by using capacity spectrum method. And the efficiency of retrofit by using infilled masonry was checked from the evaluation of its seismic capacity for various layout. As a results, it was found that the masonry infill wall increased the stiffness and strength, but reduced ductility.

Currently the seismic performance evaluation for existing buildings are being made simply through the review of the analytical technique corresponding to design specifications on beam, column, shear wall, joint and so on. Also the seismic performance is evaluated to 4 steps as immediate occupancy level(IO), life safety level(LS), collapse prevention level(CP), collapse occurrence level(CO). However, in case of a structure being used for a number of years after construction, which may have partial damages and durability degradations may show significant differences between the analysis results and the actual behavior during an earthquake. Therefore, a improved seismic performance assessment is proposed based on risk assessment and seismic performance techniques since more systematic evaluation and condition assessment are required, and thus the practical and economical seismic retrofit measures for the existing facilities and for the reasonable seismic design as well are to be developed more than ever before.

The Recent earthquake damage of surrounding countries is increasing, occurrence of frequent earthquakes in the country, thus, the interest about the seismic performance of the structure is increasing. Korea, was established in 2008 earthquake measures method, KBC2009 was also amended by design standards. KBC2009 based seismic design and seismic strengthening has become mandatory, Design of the building before the current seismic design standards must be satisfied in KBC2009. Therefore, ATC-40, FEMA-273 and seismic performance evaluation of Korea Infrastructure Safety Corporation will conduct the seismic performance evaluation at the Previous design code building.

The purpose of this study is to evaluate a RCS strengthening method for medium & low-rise R/C buildings using the nonlinear analyses of member-level. In this study, a three-story R/C buildings that represents a typical Korean school constructed in the 1980s was selected. Seismic capacities of the building before and after CFCC strengthening method are evaluated using the nonlinear static & dynamic analyses of member-level.

In the research, there were seismically strengthened reinforced concrete composite columns by applying Strain Hardening Cementitious Composites(SHCC). The seismic performance of SHCC-RC composite columns were studied by the concepts of seismic performance-based design approaches as well as with experiments.

In this paper, the effects of beam splice location on seismic performance of column-tree connections were experimentally and analytically evaluated. The study results showed very little difference between the results of analytical and those of experimental.

This paper indicates seismic performance of wing walls using Engineered Cement Composite(ECC) for retrofit of non-ductile existing building. The specimens consist wing walls of different thickness. The specimens is tested cyclic lateral loads. The test results indicated that wing walls seismic performance of 100 mm thickness improved than 70 mm wing walls.

This paper indicates seismic performance of wing walls using Engineered Cement Composite (ECC). The variable of specimens is 2 side connect and 3 side connect in RC frame. The specimens is tested cyclic lateral loads by actuator. The test results show that seismic performance of 2 side connected wing walls improved.

This paper deals with steel braced frame as increasing the lateral strength and ductility in order to seismic retrofit of existing buildings. However, There is a problem in utilizing this method. It is the approach to provide an adequate connection between the existing RC frame and the installed steel braced frame. So, the designer must be confirmed if it satisfies the required performance or not.

지진 피해 상황을 살펴보면 중소 규모의 지진이 발생하였을 때 구조물의 붕괴에 의한 직접적인 피해가 아닌 화재와 같이 소화 설비, 전력설비, 통신설비 등 주요 기간설비의 기능상실로 인한 피해가 많이 일어나고 있다. 이와 같은 2차 피해를 줄이기 위해 소화설비의 내진설계는 반드시 필요하다고 할 수 있다. 본 연구에서는 수계소화설비의 내진성능 평가를 위하여 골조 구조물에 옥내소화전설비(배관, 펌프, 수조, 소화전)를 설치하여 진동대 실험을 실시하였다. 그리고 일반시설물과 내진시설물의 거동차이를 확인하기 위하여 각 설비는 기존 건축물에 시공되어 온 일반형 시설물과 내진형 시설물을 동시에 시공하여 시험을 수행하였다. 또한, 시설물의 거동특성을 파악하기 위하여 시설별 변위응답, 가속도 응답, 가속도 응답 스펙트럼을 분석하여 시설물에 대한 내진성능을 평가하였다.

최근 발생한 대규모 지진으로 구조물의 내진보강에 대한 사회적 관심도가 높아지고 있다. 특히 내진설계가 반영되지 않은 기둥의 경우 지진에 의한 횡하중을 저항하지 못하고, 취성적인 파괴가 유발되어 구조물 전체적 붕괴를 유발할 수 있다. 따라서 빠른 시간내에 보강이 가능하면서 기둥에 손상을 주지 않는 기존의 보강법과 구별되는 응급 보강법이 필요하다. 과거에는 기둥 보강법으로 단면 증설법과 강판보강법 등이 개발되어 현장에 적용되었지만, 최근에는 FRP (Fiber Reinforced Polymer)의 장점을 활용한 탄소섬유시트공법이 많이 사용되고 있다. 본 연구에서는 긴급시공이 가능한 체결식 FRP 내진보강재를 사용한 구조물의 내진성능보강효과를 검토하고자 하였다. 검토를 위하여 실제 구조물의 축소모델의 철근콘크리트 시험체를 제작하고 횡방향 변위하중을 가력하였다. FRP 내진보강재를 이용한 내진보강시공후 실내시험을 통하여 내진성능을 평가하였다. 그 결과 개발된 보강재의 철근콘크리트 구조물에 보강 시, 내진성능이 향상됨을 확인하였다.

This study carried out a series of seismic tests to elucidate the difference of movements between two buildings with or without masonry infilled wall in reinforced concrete frames which have no quake proof plan. Both of the experimental buildings showed irreversible deformity at low drift ratio of 0.6%. The strength and stiffness of the building with masonry infilled wall were higher than those of the building without masonry infilled wall, while the ductility of the former being lower than that of the latter. Thus it led to more brittle tendency of the former.

In this study, after performing a full-scale dynamic testing of unreinforced masonry buildings, the experimental results and developed seismic performance evaluation program of existing unreinforced masonry buildings were verified by comparing the results of the program.

Recently, Seismic design criteria for major domestic structures has been being improved constantly, because the importance of seismic design for major public infrastructures is largely recognized. A preliminary assessment of the seismic performance on the existing railway tunnel, a precedent task before conducting a detailed assessment, can be use as the standard of judgement to decide whether to perform a detailed assessment or not. On the other hand, There are no reasonable study in this area. In this study, an assessment method was presented to evaluate a seismic performance of the existing railway tunnels which seismic design are not performed more economically and rationally.

The purpose of this study is to evaluate a RCS strengthening method for medium & low-rise R/C buildings using the nonlinear analyses of member levels. In this study, a three-story R/C buildings that represents a typical Korean school building constructed in the 1980s was selected. Seismic capacities of the building before and after strengthening with the RCS method are evaluated using the nonlinear static & dynamic analyses of member levels.

The purpose of this paper is to verify the seismic strengthening effect of R/C buildings strengthened with the Carbon Fiber Composite Cable (CFCC) In this study, a three-story R/C building that constructed in the 1980s was selected, and its seismic performance before and after strengthening was evaluated based on the nonlinear dynamic analyses of members levels. The result indicated that the seismic strengthening effect of the proposed CFCC method was verified in terms of both strength and ductility demands, compared to the building before strengthening.

In this study, experimental research was carried out to improve and evaluate the seismic performance of reinforced concrete beam-column joint using Embedded Carbon Fiber Rod and Carbon Fiber Sheet in existing reinforced concrete building. Test result shows that retrofitting specimen(LBCJ-SP45, CS2, CRUS) designed by the improvement of seismic performance of reinforced concrete beam-column joints load-carrying capacities were increased 1.34 ~ 1.54 times in comparison with the standard specimen.

Recently, Seismic design criteria for major domestic structures has been being improved constantly, because the importance of seismic design for major public infrastructures is largely recognized. A preliminary assessment of the seismic performance for the existing rapid-transit railway tunnel, a precedent task before conducting a detailed assessment, can be use as the standard of judgement to decide whether to perform a detailed assessment or not. On the other hand, There are no reasonable study in this area. In this study, an assessment method was presented to evaluate a seismic performance of the existing rapid-transit railway tunnels which seismic design are not performed more economically and rationally.