• Title/Summary/Keyword: steel structure

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Steel Member Standardization for Enhancement of Modular Unit Manufacturing Productivity - Focusing on Steel Structure Frame Production in Ham-Yang and Yeo-su Military Facilities BTL Projects - (모듈러 유닛 공장 생산성 향상을 위한 철골 부재 표준화에 관한 연구 - 함양·여수 병영시설 BTL 건설공사의 철골구조 프레임 생산을 대상으로 -)

  • Jang, Hwal-Je;Yoon, Seok-Woon;Lee, Jeong-Hoon;Lee, Hyun-Soo;Park, Moon-Seo;Hyun, Ho-Sang
    • Journal of the Architectural Institute of Korea Planning & Design
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    • v.32 no.1
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    • pp.69-77
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    • 2016
  • The purpose of this study is to propose of standardized modular steel structure unit for productivity enhancement of productivity in modular factory. For the verification, comparison review in various points of view between existing modular steel structure unit and standardized modular steel structure unit based on recently completion of modular system buildings. This research is suggestion of enhancement of standardized steel structure's members for better production workability. The research is based on (1) steel structure process which is most high rate (approximately 30%) of modular unit manufacturing process and (2) prototype unit size of $3M{\times}6M{\times}3.2M(H)$ among the most used in recently project. For the verification, comparison analysis between existing steel structure unit and standardized steel structure unit's manufacturing process. The research result, one modular unit of standardized steel structure manufacturing process is reducting (1) 250,042won production cost, (2) 3 hours and 49 minute of production time. Also, (3) increase the factory area availability of $203.84m^2$.

Impact of a shock wave on a structure strengthened by rigid polyurethane foam

  • Mazek, Sherif A.;Mostafa, Ashraf A.
    • Structural Engineering and Mechanics
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    • v.48 no.4
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    • pp.569-585
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    • 2013
  • The use of the rigid polyurethane foam (RPF) to strengthen sandwich structures against blast terror has great interests from engineering experts in structural retrofitting. The aim of this study is to use the RPF to strengthen sandwich steel structure under blast load. The sandwich steel structure is assembled to study the RPF as structural retrofitting. The filed blast test is conducted. The finite element analysis (FEA) is also used to model the sandwich steel structure under shock wave. The sandwich steel structure performance is studied based on detonating different TNT explosive charges. There is a good agreement between the results obtained by both the field blast test and the numerical model. The RPF improves the sandwich steel structure performance under the blast wave propagation.

A study on the steel structure detail for railway station of Korean traditional style (철골조 한옥 역사를 위한 디데일 개발 사례 연구)

  • 김종헌;주남철
    • Journal of the Korean Society for Railway
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    • v.6 no.3
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    • pp.179-185
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    • 2003
  • This paper was to find out the design methodology for korean railway station of steel structure using by wooden structure system. Traditionally Korean architecture was made by wooden structure system what is called Gong-Po (wooden bracket structure system). The abundant ornament of Korean architecture is resulted from the composition rule of Gong-Po(wooden bracket structure system). But Korean wooden structural system have a limit in constructing large building, for example railway station, airport terminal, convention center etc. It is needed to convert wooden structure system into steel structure system. But there are many differences between wooden structure and steel structure in texture, material strength, joint system of elements etc. In this paper, we will show you how to make a joint system for steel structure of railway station and how to present the traditionality of Korean architecture in railway station.

A Study on Measurement for Earth Resistance of Steel Structure (철탑접지저항 측정에 관한 연구)

  • 박석탁;김시영
    • 전기의세계
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    • v.22 no.6
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    • pp.33-51
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    • 1973
  • To lower the earth resistance shall be one of the most effective method for the prevention of lightening damage on power transmission line. In this report, in order to investigate various characteristic necessary to lowering the earth resistance, the following experiments have been made at 154KV U1San-PoHang T/L, 154KV YoSu-SoonChun T/L and so on. 1. Measurement of Earth specific resistance, 2. Efficiency of Earthing of concrete foundation for steel structure., 3. Efficiency of Earthing with counter poise., 4. Compound impulse test with foundation of steel structure and counter poise. With the above investigate a guidance have been prepared for the effective work-performance of steel structure.

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GFRP retrofitting effect on the dynamic characteristics of model steel structure

  • Tuhta, Sertac
    • Steel and Composite Structures
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    • v.28 no.2
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    • pp.223-231
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    • 2018
  • Nowadays, there are a great number of various structures that have been retrofitted by using different FRP Composites. Due to this, more researches need to be conducted to know more the characteristics of these structures, not only that but also a comparison among them before and after the retrofitting is needed. In this research, a model steel structure is tested using a bench-scale earthquake simulator on the shake table, using recorded micro tremor data, in order to get the dynamic behaviors. Columns of the model steel structure are then retrofitted by using GFRP composite, and then tested on the Quanser shake table by using the recorded micro tremor data. At this stage, it is needed to evaluate the dynamic behaviors of the retrofitted model steel structure. Various types of methods of OMA, such as EFDD, SSI, etc. are used to take action in the ambient responses. Having a purpose to learn more about the effects of GFRP composite, experimental model analysis of both types (retrofitted and no-retrofitted models) is conducted to evaluate their dynamic behaviors. There is a provision of ambient excitation to the shake table by using recorded micro tremor ambient vibration data on ground level. Furthermore, the Enhanced Frequency Domain Decomposition is used through output-only modal identification. At the end of this study, moderate correlation is obtained between mode shapes, periods and damping ratios. The aim of this research is to show and determine the effects of GFRP Composite implementation on structural responses of the model steel structure, in terms of changing its dynamical behaviors. The frequencies for model steel structure and the retrofitted model steel structure are shown to be 33.916% in average difference. Finally, it is shown that, in order to evaluate the period and rigidity of retrofitted structures, OMA might be used.

A Study on Substitution of Steel structure for Casting Frame (주조 프레임을 강 구조물로의 대체에 관한 연구)

  • 홍민성
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.8 no.1
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    • pp.142-149
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    • 1999
  • A machine frame has been manufactured by casting. However, due to the development of the industrial society, 3-D duties was refused. Especially, the declination of the casting industry makes it difficult to produce the frame. Many companies still manufacture the small casting products. The large casting products are extremely limited and manufactured for their own use. Therefore, it is difficult to keep the term of order. In this study, the characteristics of steel structure which is produced by welding were identified in the view of mechanical strength of steel structure which is produced by welding were identified in the view of mechanical strength to substitute steel structure for casting frame. But welding structure has the residual stress, HAZ and welding deformation. Residual stress and HAZ especially cause crack growth. The proposed steel structure, based on the simulation and experiment(tensile curve and S-N curve), can reduce not only the producting term but also the weight of the frame.

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Comparative Study of Design Methods for Manufacturing of Steel Structure (철구조물의 설계방법에 대한 비교 연구)

  • Kim, Dong-Kwon;Choi, Jae-Seung;Hwang, Suk-Hwan
    • Proceedings of the KSME Conference
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    • pp.357-362
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    • 2000
  • Allowable stress design(ASD) method has been widely used to design steel structures such as boiler and heat recovery steam generator(HRSG) of power plant. However, many researchers are recently intrested in road and resistance factor design(LRFD) method which may take the place of ASD. In this work, the weight calculation of steel structure was compared when ASD and LRFD were applied respectively. For the calculation of weight of steel structure, computer program was developed and applied to obtain beam weight. Using this program and GTSTRUDL, structural design program, weight of steel structure is calculated. As a result of weight calculation, maximum 5.4% of weight reduction is achieved among examples of this study by applying LRFD comparing with the result of ASD, and those results quite dependent on the applied load and member classification.

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OMA of model steel structure retrofitted with CFRP using earthquake simulator

  • Kasimzade, Azer A.;Tuhta, Sertac
    • Earthquakes and Structures
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    • v.12 no.6
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    • pp.689-697
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    • 2017
  • Nowadays, there are a great number of various structures that have been retrofitted by using different FRP Composites. Due to this, more researches need to be conducted to know more the characteristics of these structures, not only that but also a comparison among them before and after the retrofitting is needed. In this research, a model steel structure is tested using a bench-scale earthquake simulator on the shake table, using recorded micro tremor data, in order to get the dynamic behaviors. Beams of the model steel structure are then retrofitted by using CFRP composite, and then tested on the Quanser shake table by using the recorded micro tremor data. At this stage, it is needed to evaluate the dynamic behaviors of the retrofitted model steel structure. Various types of methods of OMA, such as EFDD, SSI, etc. are used to take action in the ambient responses. Having a purpose to learn more about the effects of FRP composite, experimental model analysis of both types (retrofitted and no-retrofitted models) is conducted to evaluate their dynamic behaviors. There is a provision of ambient excitation to the shake table by using recorded micro tremor ambient vibration data on ground level. Furthermore, the Enhanced Frequency Domain decomposition is used through output-only modal identification. At the end of this study, moderate correlation is obtained between mode shapes, periods and damping ratios. The aim of this research is to show and determine the effects of CFRP Composite implementation on structural responses of the model steel structure, in terms of changing its dynamical behaviors. The frequencies for model steel structure and the retrofitted model steel structure are shown to be 34.43% in average difference. Finally, it is shown that, in order to evaluate the period and rigidity of retrofitted structures, OMA might be used.

The Research and Application of Innovative High Efficient Construction Technologies in Super High Rise Steel Structure Building

  • Dai, Lixian;Liao, Biao
    • International Journal of High-Rise Buildings
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    • v.3 no.3
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    • pp.205-214
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    • 2014
  • The super high rise building construction is characterized by a large quantity of engineering works and structural components, high demanding of construction technology and complex cross operations. As the height of super high rise building increases, the construction difficulties increase, it is challenging the steel structural building construction technology. In this paper, the key technologies in the construction of Chinese modern super high rise steel structure building have been studied. The innovative tower crane supporting frame suspension disassembly technology has been developed to allow the crane supporting frame to turnover in the air without occupying materials stockyard. A new self-elevating platform technique which is capable of striding over structural barriers has been developed. This new technology allows the platform to be self-elevated along variable cross section column with a maximum 600 mm size change. A new automatic submerged arc welding technology has also been developed to ensure the process continuity and quality stability of welding job on the construction site.

The Priority Analysis of the Risk and Countermeasures for Quality Control in the Steel Structure (강구조물 공사의 품질관리를 위한 리스크 중요도 분석 및 대응방안)

  • Cho, Hang-Min;Song, Young-Woong;Ahn, Jae-Bong;Choi, Yoon-Ki
    • Korean Journal of Construction Engineering and Management
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    • v.8 no.3
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    • pp.87-96
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    • 2007
  • Recently construction environment is being professionalized. oversized and diversified. Due to fluctuation of construction environment, the demand for the project of steel structure is ieased gradually and steel construction is needed the efficient quality management. The construction of steel structure which required a variety of sub-contractors, the progress of works and technologies are comprehensive of various risks and uncertain factors. But currently the construction of steel structure is conducted the risk management by perception and experience of constructors. Therefore, the analyzing factors of the risk and establishing the device are able to manage the quality management efficiently. In this study, we have conducted the interview of experts, polls and through the Analysis Hierarchy Process (AHP) for the scientific and systematic risk management. This paper will propose a plan for systematization of the construction of the steel structure.