강-콘크리트 합성구조의 성능을 확보하기 위해서는 전단연결재가 설치된 전단연결부에 대한 전단강도 분석이 필수적이다. 전단연결부의 전단거동을 효율적으로 예측하기 위하여, 전단연결부의 push-out test에 대한 유한요소해석을 수행하였다. 유한요소해석에는 범용 프로그램인 ABAQUS가 사용되었으며, 대상 실험체는 Y형 전단연결재가 적용된 강-콘크리트 전단연 결부이다. 유한요소해석에서는 대상 실험체를 구성하는 재료들의 비선형성을 고려하였고, 비선형해석의 수렴문제를 해결하기 위하여 준정적해석을 사용하였다. 본 연구에서 수행된 유한요소해석 결과를 바탕으로 하중-변위곡선과 전단강도를 기존 실험결과와 비교한 결과, 준정적해석을 이용한 유한요소모델은 기존 실험결과를 잘 반영하는 것을 확인하였다.

강판콘크리트구조 설계기준(KEPIC SNG)에서 RC-SC구조 이종부재 접합방식은 기계적이음방법인 베이스플레이트형 접합 방식과 미겹침이음 접합방식을 제시하고 있다. RC구조간의 동일부재 접합부는 설계기준에서 철근의 직경에 따라 이음방식 을 별도로 규정하고 있지만, RC-SC구조 접합부는 철근의 직경에 따른 접합방식이 설계기준에 별도 구분되어 있지 않기 때문에 대구경 철근에 대해서도 미겹침이음 접합방식을 적용할 수 있을 것으로 예상된다. 베이스플레이트형 접합방식의 경우, RC-SC접합부 구조가 복잡하여 향후 적용성 측면에서 불리할 것으로 예상된다. 그러나, 미겹침이음 접합방식은 구조가 단순하여 적용성 측면에서 유리할 것으로 판단되나, 추가 실증실험과 전산해석을 통해 적용성 확보가 필요한 상황이다. 본 연구에서는 미겹침이음 접합방식의 주요 설계변수인 타이바와 철근정착의 구조거동을 분석하였으며, 철근의 정착성능을 강화할 수 있는 방안을 도출 및 적용하여 구조거동분석을 수행하였다.

본 연구는 전단력과 휨을 받는 춤이 작은 중공 SFRC 부재를 대상으로 중공에 따른 웨브폭이 부재의 전단강도에 미치는 영향을 평가하고자 실험 및 해석을 실시하고 기존식과 비교⋅분석하였다. 전체폭에 비하여 웨브폭은 1/2배, 2/3배로 선정하였으며, 전단경간비는 1.5로 계획하였다. 전단실험 결과, 웨브폭이 33% 증가함에 따라 최대전단강도는 10.3~28.0% 증가하였다. 실험체의 전체춤이 1.5배 증가함에 웨브폭이 100mm인 실험체는 전단강도가 29.2% 증가한 반면, 150mm인 실험체는 11.3% 증가에 그쳐, 웨브폭이 적을수록 춤의 증가에 따른 전단강도 증가율이 큰 것으로 나타났다. 이를 볼 때, 웨브폭이 적을수록 강섬유의 기여도가 큰 것으로 사료된다. KCI 기준식이 중공 슬래브의 전단강도를 매우 안전측으로 평가하고 있으며, Shin et al.의 제안식이 실험강도를 비교적 잘 예측하는 것으로 나타났다. 비선형 유한요소 해석으로부터 웨브폭이 2, 3, 6배 증가함에 따라 해석부재의 평균 전단강도는 각각 1.18배, 1.80배, 2.19배로 나타나, 웨브폭의 증가에 비례하여 전단강도가 증가하지 않는 것으로 나타났다.

In this paper, finite element analysis of high-strength SFRC with high tensile strength steel fiber was investigated. Compressive and flexural behavior was ductile when using steel fiber tensile strength 1,600 MPa. Thorenfeldt and Trilinear models were used to describe the compressive and tensile behavior. Inverse analysis was performed to construct tensile model by evaluating flexural behavior. The flexural behavior of test results were similar to analysis results.

The seismic performance evaluation of domestic thermal power generation facilities is not significant compared to its importance. Therefore, in this study, seismic performance evaluation of the chimney structure responsible for the exhaust function in the thermal power plant was performed using Abaqus, a finite element analysis program. As a result, we could obtain the flexural strength curves of concrete compressive failure and relative displacement of stack.

In this study, the torsional strength of reinforced concrete hollow beams is predicted by nonlinear finite element analysis. A nonlinear finite element analysis program, ATENA, was used for the analysis. A total of six reinforced concrete beams were used and the analysis was performed under the same conditions as the actual test.

국내뿐만 아니라 세계적인 추세로 증가하고 있는 열차의 고속화와 대량 운송능력의 요구에 따라 열차 궤도구조의 개발은 지속적으로 발전하고 있다. 콘크리트 구조궤도인 PST는 안전성과 경제성에서 그 요구조건을 충족할 수 있는 시스템으로 개발되고 있다. 따라서 본 연구 에서는 PST시스템의 각 구조부재의 거동을 분석함으로써 향후 시스템 개발 및 설계에 필요한 정보를 제공하고자 하였다. KRL-2012 열차하중과 KRC 코드에 의한 다양한 정적하중조합에 따른 응력분포 결과를 3차원 유한요소 해석을 통하여 분석하였으며, 그라우트충전층의 두께에 따른 결과 또한 제공하고자 하였다. 구조부재별로는 그라우트충전층에서 가장 큰 응력이 발생하였으며 하중조합과 두께에 따라 응력의 변화가 민감하였다. 시동하중 및 온도하중에 의해서는 KRL-2012에 의한 수직하중만 적용할 때와 비교하여 콘크리트 패널과 HSB에서 각각 3.3배, 14.1배의 발생응력이 증가하는 것으로 나타났다. 충전층의 두께가 20mm에서 80mm로 증가할 때 콘크리트 패널의 발생 응력은 4% 감소하지만, 충전층은 24% 증가하는 것으로 나타났다. 균열의 양상은 그라우트충전층에서 인장균열이 국부적으로 발생하는 것으로 나타났다. 이와같은 결과에 따라 PST시스템 개발 시에는 수직하중 보다는 수평하중에 의한 휨 및 인장거동에 세심한 주의가 필요하며, 충전층의 두께를 40mm 이상 유지함으로써 각 구조부재의 안전성을 확보할 수 있도록 한다.

This paper was conducted to investigate analytically the non-ductile reinforced concrete frame and steel frame. The results of cyclic loading test and analysis was compared. The maximum strength and strength reduction point of test result were similar to analysis result.

This paper presents the application of meso-scale finite element analysis method on concrete tensile strength. Using the meso-scale finite element analysis, an analytical study on tensile strength of concrete was conducted. From the analysis results, the size effect on split and direct tensile strength was confirmed.

When the SC structure is partially applied to a nuclear power plant building, an RC-SC connection part is generated between the SC wall and the RC slabs or RC walls. If the difference in flexural stiffness between the RC part and the RC-SC connection part is large, compressive failure of the concrete near the RC-SC connection part may occur. In this study, the flexural stiffness relaxation design such as the approach slab concept was applied and the fracture behavior was analyzed using finite element analysis. As a result, it was confirmed that concrete cracks near RC-SC connection part were reduced when flexural stiffness relaxation design is applied.

This study compared the experimental values obtained from existing papers and the analytical values obtained using nonlinear finite element analysis programs. The results show a similar aspect, with a yield load of 74.5 kN in the experiment and a yield load of 69.3kN in the analysis result showing a difference of about 6%.

In this paper, structural behavior of internal and external connection of modular system was evaluated by finite element analysis(FEA). As a result of FEA, results of experiment and analysis were nearly similar to validate analysis model. Parametric analysis will be necessary using this valid analysis model

This paper presents the application of meso-scale finite element analysis method on concrete split tensile strength. Using the meso-scale finite element analysis, an analytical study on split tensile strength of concrete was conducted. From the analysis results, the size effect on split tensile strength was confirmed.

In the KEPIC-SNG, the domestic technical standard of the SC structure, the condition that the baseplate supporting the reinforcing bars is not bonded to the surface plate is suggested. However, if the baseplate is bonded only to the wingplate, all of the rebar loads generated on the baseplate will be transferred to the wingplate. The wingplate is expected to be conservatively designed in spacing and thickness to support the rebar load. In this study, the finite element analysis was carried out according to bonding conditions between surface plate and baseplate. As a result, it was confirmed that the overall structural strength was increased when the baseplate and the surface plate were bonded. Based on this result, it is possible to propose an economical design for the RC-SC connection such as increasing the wingplate spacing.

This study is an analytical research on the size effect of concrete flexural-compressive strength. The meso-scale finite element method was used to analyze various sizes of specimens. As a result of the analysis, the size effect that the flexural-compressive strength becomes smaller as the size of specimen becomes bigger is analytically confirmed.

In this study, experiment using H-beam specimens was carried out and finite element analysis was conducted using the same method as the test. As a result, although experimental strength value was approximately 10% higher than analytical value, load-strain relationships from the experiment and analysis were relatively similar to each other.

In this paper, the finite element analysis of RC frame with concrete compressive material models proposed by many researches were conducted. As a results of FEA, the concrete model suggested by Saenz was compatible than other concrete models from the perspective of initial stiffness and maximum strength.

This study is to investigate the ultimate strength and curling influence of single shear two bolted connection with 7075-T6 aluminum alloys. The validation of element analysis was verified through the comparison between test result and finite element analysis prediction and strength reduction rate by curling was estimated quantitatively. Moreover, additional parametric analysis with extended variables was conducted and the conditions of curling occurrence according to end distance and edge distance were proposed.

In countries that suffer from heavy rain such as Korea, bridges have to be prepared for a sudden water level increase. However, research on the flood risk assessment for bridges has gained less attention than earthquakes, even though one of the major causes of bridge failures has been reported to be flood. In addition, various sources of uncertainty make it challenging to evaluate the flood fragility of a bridge, and there have been few studies on the flood fragility curve derivation for bridges. The present study proposes a new methodology employing finite element reliability analysis to derive flood fragility curve. In the proposed method, two software packages, ABAQUS and FERUM, are connected so that reliability analysis can be performed in conjunction with sophisticated finite element analysis flood fragility assessment. The method is applied a real bridge in Korea, and flood fragility curves are derived for multiple damage states.

This study investigated the behavior of newly-developed circular steel girder over bridge. The traditional bridge is a simple span with the maximum span length about 7.0m. The proposed bridge is sequenced by extending a steel tube girder and reducing the number of infrastructure. It can make to improve constructability and save cost. In this study, we conducted a finite element analysis of the behavior of the main part, and aimed to check the compliance of allowable stress.