• 국제초고층학회논문집
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• 제6권1호
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• pp.49-72
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• 2017

The Guangzhou International Finance Centre (IFC) is a landmark building that symbolizes the emerging international strength of Guangzhou, China's third largest city. It is also one of the dual iconic towers along the main axis of Guangzhou Zhujiang New Town. Arup adopted a total engineering approach in embracing sustainability and aiming at high efficiency solutions based on performance-based design principles covering structures, building services, fire engineering, vertical transportation, and façade performance to constitute an efficient and cost-effective overall building design. Through dynamic integration of architectural and engineering principles, Guangzhou IFC represents a pioneering supertall building in China. It adopts a diagrid exoskeleton structural form that is clearly expressed through the building's façade and gives the building its distinctive character. The aerodynamic shape of the building not only presents the aesthetic quality of elegant simplicity, but also reduces the effects of wind, thereby reducing the size and weight of the structure. State-of-the-art advanced engineering methods, such as optimization techniques and nonlinear finite element modelling, were applied in parallel with large-scale experimental programs to achieve an efficient and high-performance design taking into account the constructability and cost-effectiveness for a project of this scale.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2006년도 추계 학술논문 발표대회 논문집
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• pp.117-121
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• 2006

This study intends to suggest the effective methods for water leakage prevention around the windows in stone works to up-grade the outdoor public space that has been taken much portion of apartment housing trends. The subjects of the study was selected among the domestic subcontractors of stone works. There are four methods for water leakage prevention around the windows; Firstly, the painting water-proof method after the masonry. Secondly, the urethane water-proof method after galvanizing panels on the gap. Thirdly, the separation method between stone and substructure and the last one is water-proof method that they put some water-proof screen between stone and substructure with the EPDM sheets. According to the analysis of the water-proof effects, constructability and planning, we could approach to conclusion that the most influent items to the water-leakage are the filling material's deformation, the state of oxygenation and deterioration of work skill. Among the water-proof methods in construction the EPDM sheet is most excellent water-proof method to meet the technical conditions. However, we have to apply it to stone works as a water-proof method for the decrease of the leakage defects after standardizing the materials, test and construction skill because there are many work skills according the subcontractors.

• 설비공학논문집
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• 제29권5호
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• pp.269-277
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• 2017

This study consists of an analysis of pre-existing ceiling construction systems as well as the development of a replacement unitary, lightweight steel ceiling system and related legal standards. Based on the material conditions and progression of the study, appropriate components were chosen and details were modified by mock-up test. A final study model was evaluated for performance and adaptability based on four parameters (indoor environment, constructability, budget economy, and aesthetics) and compared to the pre-existing ceiling system. As a result of the initial study, a lightweight steel design was created consisting of a reinforced structure with modular bars and entry holes for components. This system was hung directly on the suspension structure. The new design increased lighting and acoustic performance adapted to an indoor environment. Moreover, the speed of construction was increased by approximately 30%, the cost was decreased by approximately 20%, and ceiling aesthetics were improved.

• 설비공학논문집
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• 제25권5호
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• pp.255-260
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• 2013

Since a chilled beam system can reduce the conveyance energy for air conditioning and has many advantages in terms of constructability and indoor environment, its supply has been rapidly expanding mainly in Europe. For this chilled beam system to be effectively available in Korea, a product suitable for the domestic climatic environment and HVAC system operating conditions needs to be developed. Also, domestic products need to have an edge in cost competitiveness compared to overseas products. In this study, the induction structure of a chilled beam is deduced and an analysis on the induction performance is carried out while the chilled beam system that meets domestic situations is in the process of development.

• 한국지진공학회논문집
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• 제25권1호
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• pp.21-32
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• 2021

Concrete masonry prisms are strengthened with steel fiber-reinforced mortar (SFRM) overlay and tested for compressive and diagonal tension strength. Masonry prisms are produced in poor condition considering standard workmanship for masonry buildings in Korea. Amorphous steel fibers are adopted for SFRM, and appropriate mixing ratios of SFRM are derived considering constructability and strength. Masonry prisms are strengthened with different fiber volume ratios, while numerous strengthened faces and additional reinforcing meshes are produced for compression and diagonal tension tests. Compression and diagonal tension strength are increased by up to 122% and 856%, respectively, and the enhancement effect for diagonal tension strength was superior compared to compression strength. Finally, the test results and strength prediction equations based on existing literature and regression analysis are compared.

• Advances in concrete construction
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• 제15권6호
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• pp.377-389
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• 2023

In this study, an improved modular arch system with the lower arch space composed of a precast arch block and an outrigger was proposed as an underground culvert, and its applicability and structural behaviors were confirmed. This modular arch culvert structure with vertical walls was designed using precast blocks and by adjusting the placement spacing of concrete blocks to the upper part form an arch shape and the lower part form a vertical wall shape, based on previously researched modular arch systems. Owing to the vertical wall of the proposed modular arch system, it is possible to secure a load-carrying capacity and an arch space that can sufficiently resist the earth pressure generated from the backfill soil and loading on the arch system. To verify the structural characteristics, and applicability of the proposed modular precast arch culvert structure, a full-scale modular culvert specimen was fabricated, and a loading test was conducted. By examining its construction process and loading test results, the applicability and constructability of the proposed structure were analyzed along with its structural characteristics. In addition, its the structural predictability and safety for the applicability were evaluated by comparing the construction process and loading test results with the FE analysis results.

• 한국터널지하공간학회 논문집
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• 제16권3호
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• pp.299-310
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• 2014

국가적으로 국토의 효율적 활용과 친환경성 등으로 인해 터널과 같은 지하공간 건설이 필요하다. 친환경적 요소의 중요성을 감안할 때, 산악지에 형성되는 도로건설에 대해 2-아치 및 대단면 터널로 계획되나 경제성, 시공성, 공사기간, 유지관리 등의 문제점을 가지고 있다. 따라서 본 연구에서는 2차로의 국도터널을 기준으로 현장조건과 지반조건을 고려하여 터널별 이격거리와 토피고를 변화시켜 경험식과 수치해석적으로 필라부의 안전성을 평가하였으며, 해석 프로그램으로 유한요소법을 적용한 Plaxis 2D를 활용하여 터널의 최소 필라폭 선정과 전체적인 터널의 거동특성을 분석하였다. 분석결과, Tie-Bolt에 의한 필라보강은 연직하중을 분산시켜 안전적인 근접병렬터널 계획이 가능하며, 터널 필라의 거동은 현장계측 결과와 잘 일치하는 것으로 나타났으며, 지반조건에 따라 터널 필라폭을 축소시킨다면 이전의 터널에 비해 효율적인 터널 활용이 가능하다.

• 한국건설순환자원학회논문집
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• 제8권4호
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• pp.545-552
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• 2020

본 연구에서는 터널 지보재로서의 역학적 성능을 충분히 발휘하면서 시공성 및 안정성을 보다 향상시키기 위한 목적으로 개발된 숏크리트용 섬유 그물망 일체형 터널 지보시스템의 지보 성능을 4점 굽힘 시험, 2차원 유한요소해석 및 단면 해석을 통해 평가하였다. 4점 굽힘 시험을 통한 휨 성능 평가 결과, 섬유 그물망 보강 숏크리트의 경우, 강섬유 보강 숏크리트와는 달리 섬유 그물망의 인장 성능이 발휘되면서 균열 이후에도 하중이 지속적으로 증가하는 결과가 나타났다. 또한, 지반 조건에 대한 터널 단면 구조 해석, 섬유 그물망 및 강섬유 보강 숏크리트의 단면 해석 결과, 섬유 그물망 보강 숏크리트의 타설 두께를 기존에 비해 감소시켜도 충분한 지보 성능이 발휘될 수 있는 것으로 나타났다. 추가적으로, 이와 같은 결과를 종합하여, 암반등급 3등급 지반 중 보다 높은 안정성을 요구하는 시공 구간에 효율적으로 적용될 수 있는 숏크리트용 섬유 그물망 일체형 터널 지보시스템의 지보패턴이 제안되었다.

• 한국구조물진단유지관리공학회 논문집
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• 제17권3호
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• pp.126-135
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• 2013

교량의 장대화로 고품질과 양호한 시공성을 갖는 고유동성 매스콘크리트가 프리스트레스 콘크리트 거더에 광범위하게 사용되고 있으나, 수화열과 자기수축에 의한 비구조균열을 종종 발생하고 있다. 대상부재의 콘크리트응력에 대한 다양한 실험과 수치해석을 통하여 평가로부터 메스콘크리트의 수화열 증가에 따라 인장응력 및 균열지수를 예측하였다. 또한 분체계 혼화재료에 의한 자기수축 증가는 정착부 부근 매스콘크리트의 인장응력을 가중시킨다. 수화열과 자기수축 및 건조수축에 의한 인장응력은 PSC 거더의 대부분에서 약간의 응력증가를 나타내나, 정착부 근처의 인장응력은 콘크리트의 재령초기에 인장강도를 초과하게 되어 균열을 유발하게 됨을 알 수 있었다.

• 한국강구조학회 논문집
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• 제26권5호
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• pp.463-471
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• 2014

최근 건축물의 초고층화, 대형화 및 장경간화에 따른 요구 성능의 증대에 따라 강재 및 콘크리트 등의 구조재료가 지니는 재료강도 및 사용성 등을 향상시키고자 하는 노력이 지속적으로 이루어지고 있다. 본 연구에서는 개발된 건축구조용 고성능 강재의 기계적, 화학적 소재 특성을 평가하고, 실제 Project를 대상으로 대안설계를 수행하여 고강도 강재의 경제성을 평가하였다. HSA800은 고강도와 좋은 용접성을 갖추기 위해 TMCP 방식으로 제조되었으며, 기계적, 화학적 성질 모두 KS규격을 만족하였다. 또한 HSA800의 고층건물의 적용성 및 경제성 평가를 위해 SM490강재 모델과 사용성에 초점을 두고 비교 평가를 수행하였다. 그 결과 SM490대비 약 30% 물량절감이 가능하였다. HSA800의 사용은 추후 건축구조의 제작, 시공 뿐만아니라 공사비 절감에도 기여할 것으로 기대되어진다.