• Structural Engineering and Mechanics
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• 제50권4호
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• pp.501-524
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• 2014

This paper presents a type of composite box girder with corrugated webs and concrete filled steel tube slab to overcome cracking on the web and reduce self-weight. Utilizing corrugated steel web improves the efficiency of prestressing introduced into the top and bottom slabs due to the accordion effect. In order to understand the loading capacity of such new composite structure, experimental and numerical analyses were conducted. A full-scale model was loaded monotonically to investigate the deflection, strain distribution, loading capacity and stiffness during the whole process. The experimental results show that test specimen has enough loading capacity and ductility. Based on experimental works, a finite element (FE) model was established. The load-displacement curves and stress distribution predicted by FE model agree well with that obtained from experiments, which demonstrates the accuracy of proposed FE model. Moreover, simplified theoretical analysis was conducted depending on the assumptions which were confirmed by the experimental and numerical results. The simplified analysis results are identical with the tested and numerical results, which indicate that simplified analytical model can be used to predict the loading capacity of such composite girder accurately. All the findings of present study may provide reference for the application of such structure in bridge construction.

• 한국강구조학회 논문집
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• 제9권1호통권30호
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• pp.121-128
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• 1997

It has been reported by the existing papers that the ultimate load capacity and energy absorption capacity of the CFST column are considerably higher than those resulting from a simple addition of the capacities of the concrete and the steel tube. It is normally believed that the confined effect for the infilled concrete due to the hoop tension of steel at the parameter of cross sections can remarkably improve the ductility and energy absorption capacities of the CFST columns. This paper provides the results of a study on the load-carrying capacities and energy absorption capacities of the CFST columns, a numerical analysis method, i. e. N-M interaction curves and Moment curvature relationships. The numerical approaches are verified by comparing with the existing test results and the circular and square steel tube sections are selected to clarify the amount of confinement effects to improve the ultimate deformable capacity(a ultimate strain value) of the infilled concrete. Then, an adequate value of the ultimate strain of the infilled concrete and an equation of the ultimate capacity of the CFST column are suggested.

• 한국항해항만학회지
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• 제33권5호
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• pp.353-359
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• 2009

국내 컨테이너 터미널의 대부분 컨테이너 처리량에 비해 장치장 규모가 협소한 편이다. 장치장이 협소한 이유는 터미널 개발 시 적용된 이론적인 안벽 처리능력이 실제 처리능력과 차이가 나기 때문이다. 또한 최근 선박이 대형화 되면서 터미널들이 안벽장비를 추가 투입함으로써 안벽 생산성을 당초보다 크게 향상시킨 현실에 기인하기도 한다. 본 연구에서는 터미널 운영 현실을 반영하여 하역 능력을 재산정하고 10,000TEU에 이르는 초대형 선박을 대상으로 하여 소요 장치장 규모를 산정 한 후 기존 터미널의 장치장 규모와 경제성을 비교하는 것을 주목적으로 한다.

• Earthquakes and Structures
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• 제23권2호
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• pp.197-206
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• 2022

Recently, steel-timber hybrid buildings have become prevalent worldwide because several advantages of both steel and timber structures are maintained in the hybrid system. In Taiwan, seismic design specification related to steel-timber hybrid buildings remains void. In this study, the ductility capacity of steel-timber hybrid buildings in Taiwanese seismic design specification is first proposed and evaluated using nonlinear incremental dynamic analysis (IDA). Three non-linear structural models, 12-story, 8-story, and 6-story steel-timer hybrid buildings were constructed using OpenSees. In each model, Douglas-fir was adopted to assemble the upper 4 stories as a timber structure while a conventional steel moment-resisting frame was designated in the lower part of the model. FEMA P-695 methodology was employed to perform IDAs considering 44 earthquakes to assess if the ductility capacity of steel-timber hybrid building is appropriate. The analytical results indicate that the current ductility capacity of steel moment-resisting frames can be directly applied to steel-timber hybrid buildings if the drift ratio of each story under the seismic design force for buildings in Taiwan is less than 0.3%. As a result, engineers are able to design a steel-timber hybrid building straightforwardly by following current design specification. Otherwise, the ductility capacity of steel-timber hybrid buildings must be modified which depends on further studies in the future.

• 한국산학기술학회논문지
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• 제11권2호
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• pp.620-627
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• 2010

본 연구는 공사조건이 유사한 특정지역의 골프장 건설공사에 대해 실적공사자료를 공사규모와 시간을 고려하여 공사비를 예측하는 식을 토대로 초기계획단계에서 골프장건설 공사비를 예측하기 위한 기초자료를 제시하였다. 즉, 골프장 건설공사를 하는데 실제 투입된 실적공사자료들을 비교.분석하고 건설공사비지수를 고려하여 골프장 건설공사의 초기계획단계에서 건설공사비를 추정할 수 있는 공사비 예측식을 제안하였다. 연구의 결과, 8개의 골프장자료를 이용하여 회귀분석으로 골프장 공사비예측을 위한 비용-규모 지수 n을 구한 결과, 총공사비 0.72, 순공사비 0.67로 도출되었다.

• 한국지반환경공학회 논문집
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• 제14권6호
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• pp.5-11
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• 2013

국내의 소음 진동규제는 점점 더 강화되고 있어 도심지 근접시공을 위해 현재의 저소음 저진동 공법보다 더욱 환경친화적인 공법이 필요하게 되었다. 이 연구에서는 무소음 무진동 공법을 위한 스크류콘크리트말뚝공법의 특징에 대하여 설명하였으며 국내 특정 현장에서 시험시공을 실시하고 말뚝재하시험을 실시하여 시공방법에 따른 연직하중 지지능력을 연구하였다. 선행굴착방식으로 시공된 스크류콘크리트말뚝의 연직압축지지력이 선단분출형슈방식으로 시공된 스크류콘크리트말뚝의 그것보다 70% 이상 크게 나타났다.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2001년도 학술논문발표회
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• pp.118-123
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• 2001

The objectives of this research are to verify the structural stability and estimate the resisting performance of Stressed-Arch system during the construction process. Full scale models are taken to obtain the objective shape by the Dynamic Relaxation Method. As a result, it measured more strain than yielding strain at the extreme fiber of top chord member on the crown, but it is shown that members have the sufficiently compressive resisting performance as well as a considerable strain recovery capacity under unloading. Therefore, it is confirmed that Stressed-Arch system apparently have sufficient range of the structural capacity, but it is required that the elasto-plastic behavior of this system must be verified more detailed by numerical analysis and experiments.

• 한국산학기술학회논문지
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• 제11권7호
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• pp.2670-2675
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• 2010

한옥에서 축부는 건물의 외관과 실내 환경, 공사기간 및 공사비와 밀접한 관련을 지닌 부분이다. 본 연구에서는 전통적인 시공법을 분석하여 전통 한옥의 장점으로서의 특성을 유지하면서 개선된 한옥 축부의 시공법을 제안하였다. 그 개선안은 기성품의 사용, 전체 공정의 건식 조립공법화, 기둥과 벽체의 일괄 시공, 기밀성과 단열성능 향상 등의 특성을 지닌다. 앞으로 시제품의 제작과 성능 시험 등의 단계를 거쳐야 하겠지만 한옥의 형태적 특성을 유지하면서 공사기간과 공사비를 줄이는데 일조할 수 있을 것으로 기대한다.

• 한국산업융합학회 논문집
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• 제5권4호
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• pp.329-337
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• 2002

It is the actual condition that the increasing traffic delay and accident caused by inefficient management on various construction by occupying the roadways. Since almost roadway improvements are for the public convenient, negative effects by them are ignored. But now due to the increase of traffics demand and limitation of road supply, the positive management scheme and treatment plan on the constructions must be considered. Thus, to the extent of this study divides uninterrupted flow into freeways and the Highway, yielding the time spread between under construction and not, that is delay time, we build capacity and delay model in the change of traffic volume and occupying length.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 춘계학술대회 논문집
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• pp.697-706
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• 2011

There are more than 800 railway steel plate girder bridges which are in use and the total length is approximately 50 km. Among these, it shall be pointed out that non-ballast rail systems which lay on wood sleepers are the most critical members. To strengthen this type of structures, mainly two methods have been applied. The first one is the most typical method which is to replace the girders with slab girder system or steel composite girders and to add ballast. It is not uncommon that the construction cost of substructure is more than ten time higher than that of superstructures and even in this case, the structural uncertainty for the substructures is not diminished. To resolve above mentioned problems, new method was developed to rehabilitate railway steel girder bridge by adding PC-slab using transport equipment. Using this method, substructure strengthen is rarely required because the additional weight to the bridge superstructure is only up to 1.0t/m. Also it was possible to save the construction cost by reducing construction duration and by simplifying the construction process. Experimental construction was performed for Jewon bridge and measurements were performed before and after construction to verify the bridge capacity.