• Architectural research
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• 제10권1호
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• pp.13-23
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• 2008

It is the purpose of this study to evaluate the structural performance of steel pipe splice for SD500 high-strength reinforcing bar, through a cyclic loading test. The experimental variables adopted in this study include the development length of rebar, the type of sleeve, and size of reinforcing bar, among others. The results of this study showed that the developed steel pipe splice system for SD500 high-strength reinforcing bar, retained the structural performance required in domestic, ACI and AIJ code. It is considered that the study result presented in this paper can be helpful in developing a reasonable design method for a steel pipe splice system for SD500 high-strength reinforcing bar.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2004년도 가을 학술발표회 논문집
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• pp.84-89
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• 2004

In this paper, cyclic plasticity model of SM490 TMC was formulated by basing on monotonic loading test and cyclic loading test. For exact description of cyclic performance and plastic deformation capacity of steel member using SM490 TMC, formulated cyclic plasticity model and finite deformation theory were applied to 3-dimensional elastic-plastic FE analysis. Cyclic plastic behavior of pipe-section steel column using SM490 TMC was clarified by carrying out numerical analysis. Also, in order to clarifying seismic performance of pipe-section steel column using SM490 TMC, analysis results were compared with analysis results of pipe-section steel column using SM490. A comparison of analysis results shows that SM490 TMC pipe-section steel column has a better cyclic performance for strength and energy dissipation than SM490 pipe-section steel column under cyclic loading

• Architectural research
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• 제10권2호
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• pp.27-35
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• 2008

Because of several advantages of mortar-filled sleeve splice in reinforced concrete buildings, this method is being applied increasingly at construction sites and various methods of the splice have been developed in Korea and other countries. In order to apply this system in the field, studies on mortar-filled sleeve splice have been mainly experimental research focused on overall structural performance. However, for understanding the structural characteristics of this splice more accurately, we need to study the confining effect of sleeve, which is known to affect bond strength between filling mortar and reinforcing bar, the most important structural elements of the bar splice. Thus, in order to examine the confinement effect of mortar-filled steel pipe sleeve splice, the present study prepared actual-size specimens of steel pipe sleeve splice, and conducted a loading. Using the test results, we analyzed how the confining effect of steel pipe sleeve affects the bond strength of this splice and obtained data for developing more reasonable methods of designing the splice of reinforcement.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2008년도 춘계 학술발표회 초청강연 및 논문집
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• pp.511-520
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• 2008

The steel pipe strut for a means of the retaining structure has been used generally in North America, Europe and China so far. However, Korea and Japan, two countries are much familiar with H-shape steel strut having its anisotropic strength on two different axes(named as strong and weak axes), even though they recognize the steel pipe's excellence of structural function associated with its compressive ability. This trend is mainly due to a number of its field application, accumulated know-hows and workmanship etc. This paper introduces particular features of a high-strength steel pipe strut in comparison with the H-shape steel strut and its application for two excavation sites in Seoul. As a result of field verification, the high-strength pipe steel strut is more effective than the H-shape steel strut in terms of construction costs, schedules, constructibility and structural stability.

• Structural Engineering and Mechanics
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• 제87권1호
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• pp.69-84
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• 2023

The use of steel pipe dampers (SPD) as fuses or interchangeable elements in the steel moment-resisting frames (MRF) is one of the newest methods for improving seismic performance. In the present study, the performance of steel pipe dampers in MRF has been investigated. Evaluation of MRF with and without SPD models were performed using the finite element method by ABAQUS. For validation, an MRF and MRF with steel pipe dampers were modeled that had been experimentally tested and reported in previous experimental research and a good agreement was observed. The behavior of these dampers in frames of 3, 6, and 9 stories was studied by modeling the damper directly. Nonlinear time history dynamic analysis was used. It was observed that by increasing the number of stories in the buildings, steel pipe dampers should be used to perform properly against earthquakes. The installation of steel pipe dampers in steel moment-resisting frames shows that the drift ratio between the floors is reduced and the seismic performance of these frames is improved.

• 대한토목학회논문집
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• 제31권6C호
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• pp.251-258
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• 2011

강관말뚝은 오랫동안 다양한 깊은 기초에 적용되어 왔으나 최근 강재가격의 상승으로 균질한 품질, 큰 강성, 용이한 시공 등의 장점에도 불구하고 기술자들이 자유롭게 적용 못하고 있다. 그러므로 강관말뚝으로 시공할 경우에는 초기 항타후 계획고 이상에서 절단된 강관을 재활용할 수 있다면 공사비를 절감하는데에 기여할 수 있다. 이러한 사유로 인하여 시공자들은 항타후 절단된 강관말뚝을 새롭게 시공할 말뚝과 함께 시공하고자 하나 명확한 정량적인 항타후 강관말뚝의 거동특성의 부재 및 재활용을 위한 적절한 대응방법과 기준의 부재로 인하여 말뚝의 건전도 문제, 문제 발생시의 대응방법 부재 등이 실제 현장에서 종종 발생하고 있다. 본 연구에서는 신규 강관말뚝과 사용자 하중 또는 극한 하중을 받은 강관말뚝에 대하여 현장에서 수행한 말뚝 동재하시험과 실내에서의 피로시험, 인장시험, 샤르피 충격시험을 실시하여 그 결과를 비교분석하였다. 시험결과로부터 허용응력 수준의 항타응력이 발생한 사용 하중조건에서는 항복강도의 변화가 2% 이하이며 최대 허용항타응력($0.9{\sigma}_y$)을 항타횟수가 3000회까지 받은 극한 하중조건에서는 항복강도의 변화가 5% 이하인 것을 확인할 수 있다. 또한 각 변수의 민감도를 확인하기 위하여 통계분석을 실시하였다. 모든 실험결과로부터 강관말뚝의 재활용 가능여부에 대한 판단 기준은 항복강도의 변화 보다는 오히려 샤르피충격에너지, 용접부에서의 강도변화 및 품질관리, 강관의 단면 변화, 항타후 강관의 국부좌굴에 기인하는 것을 확인할 수 있었다.

• Structural Engineering and Mechanics
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• 제64권5호
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• pp.671-681
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• 2017

This study investigates the structural performance of 3D steel pipe rack suspended scaffolding systems. For the purpose, a standard full scale 3D steel pipe rack suspended scaffolding system considering two frames, two plane trusses, purlins and wooden floor is constructed in the laboratory. A developed load transmission system was placed in these experimental systems to distribute single loads to the center of a specific area in a step-by-step manner using a load jack. After each load increment, the displacements are measured by means of linear variable differential transducers placed in several critical points of the system. The tests are repeated for five different system conditions to determine the structural performance. The means of system conditions is the numbers of the tie bars which are used to connect plane trusses under level. Finite elements models of the 3D steel pipe rack suspended scaffolding systems considering different systems conditions are constituted using SAP2000 software to support the experimental tests and to use the models in future studies. Each of models including load transmission platform is analyzed under a single loading and the displacements are obtained. In addition, to calibrate the numerical models some uncertain parameters such as elasticity modulus of wooden floor and connection rigidity of purlins to plane trusses are assessed experimentally. The results of this work demonstrate that when increasing numbers of tie bars the displacement values are decreased. Also the results obtained from developed numerical models have harmony with those of experimental. In addition, the scaffolding system with two tie bars at the beginning and at the end of the plane truss has the optimum structural performance compared the results obtained for other scaffolding system conditions.

• 한국구조물진단유지관리공학회 논문집
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• 제11권6호
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• pp.169-180
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• 2007

본 연구에서는 SD500 고강도 철근에 적합한 강관 스플라이스 슬리브를 개발한 후에 실물크기의 20개 실험체를 제작하여 가력실험을 실시하였다. 그리고 강도를 비롯한 구조성능을 철근의 정착길이, 슬리브의 타입, 철근의 규격과 같은 실험변수에 따른 영향을 분석하고, 국내기준을 비롯한 주요기준에 따라서 비교, 평가하였다. 실험 결과는 SD500 고강도 철근용으로 개발된 강관 스플라이스 슬리브 철근이음은 주요기준에서 요구하는 구조성능을 가지고 있는 것으로 확인되었고 SD500 고강도 철근용 슬리브 철근이음에 대한 구조설계 기준 확립을 위한 기술적 자료를 제시하였다.

• 복합신소재구조학회 논문집
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• 제7권1호
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• pp.1-8
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• 2016

In this paper, the full-size structural performance test for a lightweight soundproof tunnel composed of partitioned pipe truss members is carried out to investigate the structural performance. In addition, a nonlinear structural analysis of the same finite element model as the full-size testing model is performed to compare the test result. The test and analysis results showed that the lightweight soundproof tunnel ensures the structural safety against wind loads, snow loads and load combinations. As a result, the full-size test and analysis results meet all the design load conditions, hence the proposed lightweight soundproof tunnel is ready for the field application.

• 대한기계학회논문집A
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• 제31권3호
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• pp.403-408
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• 2007

The concrete pipe(Hume, PC) and polyethylene(PE) pipe are usually used for dram pipe in local market. Hume pipe, however, is heavy and needs the high cost of construction and PC pipe has a disadvantage to easily occur the deformation by the outside pressure even though it is light and constructible. The corrugated steel pipe coated with polyethylene is used increasedly because it is durable, constructible and economical. However, it is not used for sewage or waste water because it is hard to guarantee the watertight property on the coupling part. In this study, we studied on the flange coupling and the method of its construction to guarantee the watertight property and easy to use. If the developed flange coupling and method are used on a construction field, the economical property, constructible property and structural safety can be guaranteed.