In this stydy, experimental research was carried out the hysteretic behavior of reinforced concrete haunched beams such as application with or without haunched. Test results showed that test specimens(FTH) was increased respectively the maximum load carrying capacity by positive 18%, negative 29% in comparison with the specimens(FTG). And the specimens(FTH) showed stable hysteretic behavior compared to the specimen(FTG)

In this study, experimental research was carried out to evaluate and improve the seismic performance of reinforced concrete beam-column joint regions using strengthening materials (CFRP sheet, AFRP sheet, embedded CFRP rod) in existing reinforced concrete structure. Therefore it was constructed and tested seven specimens retrofitting the beam-column joint regions using such retrofitting materials. Specimens, designed by retrofitting the beam-column joint regions of existing reinforced concrete structure, were showed the stable failure mode and increase of load-carrying capacity due to the effect of crack control at the times of initial loading and confinement of retrofitting materials during testing. Specimens LBCJ-CRUS, designed by the retrofitting of CFRP Rod and CFRP Sheet in reinforecd beam-column joint regions were increased its maximum load carrying capacity by 1.54 times and its energy dissipation capacity by 2.36 times in comparison with standard specimen LBCJ for a displacement ductility of 4 and 7. And Specimens LBCJ-CS, LBCJ-AF series were increased its energy dissipation capacity each by 2.04~2.34, 1.63~3.02 times in comparison with standard specimen LBCJ for a displacement ductility of 7.

In this study, experimental research was carried out to evaluate the structural performance of the reinforced concrete beam retrofitted by strengthening methods(embedded CFRP rod of hexagon, CFRP Sheet) in existing reinforced concrete buildings. Test results showed that the maximum load carrying capacity of retrofitted specimens(NER2, NER2-C) were increased by 1.46 ~ 1.67 times respectively in comparison with the standard specimen(NBS).

본 연구에서는 기존 철근콘크리트 건축물의 구조성능 개선을 위하여 표면요철 매입형 FRP봉과 CFRP시트를 사용한 철근콘크리트 보의 구조성능을 평가하기 위하여 실험을 수행하였다. 표면요철 매입형 FRP봉의 사용량, CFRP시트 보강 유무에 따라 총 7개의 실험체를 제작하고 실험을 수행하여 구조성능을 평가하였으며, 본 연구의 실험결과를 근거로 다음과 같은 결론을 얻었다. 표면요철 매입형 FRP봉 보강 실험체 NER 시리즈의 경우, 표준실험체 NBS와 비교하여 12~46% 내력이 증가하였고, 표면요철 매입형 FRP봉과 CFRP시트를 복합 보강한 실험체 NERL 시리즈는 표준실험체 NBS보다 최대내력이 22~77% 증가하였다. 그리고 표면요철 매입형 FRP봉으로 보강된 실험체 NER 시리즈는 부착슬립, 피복분리 형태로 파괴되었으나, 표면요철 매입형 FRP봉과 CFRP시트을 복합 보강한 실험체 NERL 시리즈는 CFRP시트의 연속보강에 따른 콘크리트 구속효과 및 모재와 표면요철 매입형 FRP봉의 부착강도 증가로 인하여 부착슬립의 형태로 파괴되었다.

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 study, experimental research was carried out to evaluate the structural performance of the reinforced concrete beam hybrid retrofitting with two materials(groove and embedding FRP rod, CFRP sheet) in existing reinforced concrete buildings. Test results showed that the maximum load carrying capacity of retrofitted specimens(NER1, NER1B, NER1L) were increased by 1.11 ~ 1.22 times respectively in comparison with the standard specimen NBS.

In this study, experimental research was carried out to evaluate the structural performance of high strength R/C interior beam-column joints regions, with or without the shear reinforcement. Specimens designed by the interior beam-column joint regions without the shear reinforcement of existing reinforced concrete building showed a unstable mode of failure and an decrease in load-carrying capacity and energy dissipation capacity and ductility ratio.

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.

In this study, experimental research was carried out to evaluate and improve the constructability and structural performance of high strength R/C interior beam-column joints regions, with or without the shear reinforcement, using high ductile fiber-reinforced mortar. Specimens designed by retrofitting the interior beam-column joint regions of existing reinforced concrete building showed a stable mode of failure and an increase in load-carrying capacity due to the effect of enhancing dispersion of crack control at the time of initial loading and bridging of fiber from retrofitting new high ductile materials during testing.

In this study, experimental research was carried out to evaluate the structural performance of the reinforced concrete beam retrofitted by strengthening methods(embedded FRP rod of hexagon, metal fittings) in existing reinforced concrete buildings. Test results showed that the maximum load carrying capacity of retrofitted specimens(BCR, BCR-AC1, BCR-AC2) were increased by 55%, 47%, and 52% respectively in comparison with the standard specimen BSS.

In this study, experimental research was carried out to study the high strength RC exterior beam-column joints regions, without the shear reinforcement, using high ductile fiber-reinforced mortar. Test results showed that specimen BCJNSP1.0 were increased th maximum load-carrying capacity and showed stable hysteresis behavior and satisfactory crack pattern in comparison with th specimen BCJNS without shear reinforcement in the beam-column joint region.

In this study, experimental research was carried out to improve and evaluate the seismic performance of reinforced concrete beam-column joint using carbon fiber sheets in existing reinforced concrete building. Test result shows that retrofitting specimen(LBCJ-CS1, CS2) designed by the improvement of seismic performance of reinforced concrete beam-column joints load-carrying capacities were increased 1.26～1.35 times in comparison with the standard specimen.

항만에 있어서 하역장비는 매우 중요하다. 컨테이너 크레인이나 트랜스퍼 크레인 같은 장비가 고장이 나면 수리나 예비품의 재주문에 걸리는 시간동안 작업이 이루어지지 못하므로 엄청난 비용손실을 초래한다. 그러나 가격이 고가이므로 예비품을 많이 보유할 수도 없는 형편이다. 대체적으로 부피가 크고 고가인 항만 장비의 특성상 효율적인 예방정비와 고장 분석을 통해 장비의 신뢰성을 확보하는 것이 무엇보다 필요하다. 본 연구는 항만 장비 중 주요 장비인 트랜스퍼 크레인을 선정하여 시스템 및 기능, 고장 메카니즘을 분석하였으며, 고장/정비 이력 데이터의 수집 및 정리를 통하여 고장과 정비 작업의 내용을 표준화하였다. 장비의 운영 및 정비 작업을 전산화하기 위한 기초 작업인 본 연구는 다음 세대 장비의 최적 설계와 장비의 최적 운영 정책을 설계하는 새로운 시도가 될 것이다.