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Development of BIM-based bridge maintenance system for cable-stayed bridges
심창수,강휘랑,Ngoc Son Dang,이덕근 국제구조공학회 2017 Smart Structures and Systems, An International Jou Vol.20 No.6
Maintenance plays a critical role in the bridge industry, but actual practices show many limitations because of traditional, 2D-based information systems. It is necessary to develop a new generation of maintenance information management systems for more reliable decision making in bridge maintenance. Enhancing current work processes requires a BIM-based 3D digital model that can use information from the whole lifecycle of a project (design, construction, operation, and maintenance) through continuous exchanges and updates from each stakeholder. This study describes the development of a data scheme for maintenance of cable-stayed bridges. We implemented the proposed system for a cable-stayed bridge and discussed its effectiveness
심창수,김동찬,최대헌,진경석 대한토목학회 2016 대한토목학회논문집 Vol.36 No.5
In this paper, a connection details for precast arch structures was proposed. Experiments were performed to evaluate structuralperformance of the loop connection details satisfying current design requirements and of alternative details for improvement ofconstructability. Precast arch specimens considering the current design requirements showed higher structural capacity than acast-in-place arch specimen. Crack width at the connection of arch crown showed smaller value than 0.2 mm due to increasedcompression force by the applied vertical load. Strengthening by wire-mesh at notch area of the connection improved initial crackcontrol capability. Connection detail with couplers and headed bars showed similar capacity to the reference specimen. The alternativedetails to improve constructability of reinforcements can be used without decreasing structural performance. Specimens with smallerinternal diameter of mandrel and shorter loop splicing than the current design codes showed worse behavior in terms of crack widthcontrol. 이 논문에서는 프리캐스트로 제작된 아치 구조의 연결을 위한 루프 이음 상세를 제안하였다. 설계기준에서 제시하고 있는 루프 이음 상세의 요구사항을 만족하는 경우와 시공성을 개선하기 위한 상세 대안들에 대한 평가를 위한 실험적 연구를 수행하였다. 설계 요구사항을 만족하는 경우에는 프리캐스트 아치 실험체가 현장타설 일체형 부재에 비해서 높은 내하력을 나타내었다. 아치구조의 크라운 부위에서의 균열은 초기 균열 발생이후 증가되는 압축력 효과로 인해서 0.2 mm를 초과하지 않는 균열폭이 발생하였다. 초기 균열 제어에 노치부의 와이어메쉬 보강이 효과를 보였고 철근 커플러와 확대머리철근을 이용한 연결부 상세도 기준 부재 이상의 내하력을 나타내었다. 시공성 개선 상세의 경우 구조적 거동에 차이를 보이지 않아서 작업자의 배근 시공성을 개선할 수 있을 것으로 판단된다. 루프철근의 내면 반지름과 겹침 이음 길이는 현재의 설계기준의 요구사항을 만족시키지 않으면 균열폭 제어 측면에서 좋지 않은 결과를 나타내었다.
Design of Protective Structures with Aluminum Foam Panels
심창수,윤누리,신동훈,유일형 한국강구조학회 2013 International Journal of Steel Structures Vol.13 No.1
Design of protective structures requires multiple functions and reasonable safety criteria according to target structures. Hardening is one of the common concept to protect facilities and people. A general concept of blast pressure mitigation by metal foams was proposed. In this paper, a composite panel with aluminum foams and steel skins is introduced. Aluminum foams have low density and are attractive materials to mitigate high-speed pressure by blast loads due to high-energy absorption capabilities. A steel skin with high energy absorption capacity can be effectively used to resist penetration at front surface of the barrier and debris risk at rear surface. Mechanical properties of the aluminum foam according to different densities were obtained by material tests. Three material models for concrete, steel and aluminum foam were utilized considering strain-rate effects. Using the derived material models, explicit analyses of the composite panels were performed and their performance was evaluated. The newly developed high strength foam showed higher yield strength and better energy absorption capacity resulting in lightweight protective panels. For high blast pressure, the combination of energy absorbing steel skin and relatively dense foam or thicker foam is more effective.
Experiments on Shear Connections of PSC Girders with Prefabricated Slabs
심창수,정철헌,현병학,김영진 한국콘크리트학회 2004 콘크리트학회논문집 Vol.16 No.4
For the fast construction and replacement of bridges in urban area, a prefabricated bridge system can be an excellent alternative. Details of prefabricated slabs for PSC girders were developed and static tests on shear connections were conducted to propose design equations of the shear connection. Stirrups and stud connectors were used as shear connectors and non-shrink mortar was used for the filling material in shear pockets for shear connectors. Stirrups and studs were fabricated to insert embedded nut-type devices in PSC girders. Shear strength of the shear connection considering chemical bond, friction and mechanical connectors was evaluated and empirical equations were suggested. Due to the mechanical connectors, ultimate slip capacity of the shear connection was sufficient for shear load redistribution, and suggested details of the shear connection showed good performance in terms of strength and ductility.
심창수,( Sawanta S. Mali ),홍창국 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
The CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> (MAPbI<sub>3</sub>) perovskites for low-cost, efficient solid state solar cells were successfully synthesized by a simple solution process. The phase confirmation of synthesized MAPbI<sub>3</sub> was characterized by X-ray diffraction (XRD), and optical properties were studied by optical absorption. The XRD characterization reviles that synthesized MAPbI<sub>3</sub> has pure tetragonal phase. The spin coated MAPbI<sub>3</sub> thin film shows good absorption spectra in visible light region with 1.54eV of indirect band gap character. The synthesized MAPbI<sub>3</sub> was applied for solid state solar cells as a light absorber. The solar cells were fabricated based on mesoporous TiO<sub>2</sub> via spin coating method. The thickness of TiO<sub>2</sub>, perovskite loading and hole transporting layer were optimized in order to get good efficiency. The photoelectric character of optimized solar cell shows Voc: 0.87 V, Jsc: 17.66 mA/㎠, Fill factor: 60% and 9.82% of efficiency.