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Analytical Investigation on Seismic Behavior of Inverted V-braced Frames
염희진,유정한 한국강구조학회 2018 International Journal of Steel Structures Vol.18 No.1
An inverted V-braced frame is one of the most widely used CBFs (Concentrically Braced Frames) owing to many advantages in constructional design. The seismic behaviors of inverted V-braced frames is that brace buckling occurs due to strong motion generation, and that in turn vertical unbalanced force is created between tension brace and compression brace, resulting in an additional load onto beams. Thus, members of beams should be designed to have enough strength to ensure plastic hinge is not created. In this study, a series of finite element analysis was conducted to evaluate the earthquake-resistant performances of the methods to design the clearance distance of gusset plates in inverted V-braced frames, and to evaluate vertical unbalanced force depending on the cross-section size of beams. It was found that the results of the equation of vertical unbalanced force in the current standards were more conservative than the load generated through the real analysis model. In addition, the model of designing elliptical clearance distance showed higher earthquake-resistant performances than that of designing linear clearance distance, which requires the reconsideration and improvement of the current practices of calculating vertical unbalanced force and setting clearance distance.
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쉬어탭 공유 접합부를 갖는 비내진중심가새골조의 내진거동
염희진,정은비,유정한,Yeom, Hee Jin,Jung, Eun Bi,Yoo, Jung Han 한국강구조학회 2015 韓國鋼構造學會 論文集 Vol.27 No.3
특수중심가새골조(Special Concentrically Braced Frames)는 우수한 경제성, 비탄성 변형 능력, 연성 등의 이점 때문에 횡하중 저항 시스템으로써 다양한 구조물에 적용하고 있다. 이러한 이점으로 국내 외 연구진의 특수중심가새골조에 대한 연구가 지속적으로 진행되어 설계법과 기준이 비약적으로 발전한 반면에, 과거에 설계된 중심가새골조의 내진 성능에 대한 연구는 미약하다. 특히, 1988년 이전에 설계된 중심가새골조는 현재 기준과 비교하여 상대적으로 적은 설계요구를 반영하였기 때문에 내진 거동에 대한 평가가 시급한 실정이다. 본 연구에서는 이러한 중심가새골조를 비내진중심가새골조(Non-Seismic Concentrically Braced Frames)라 칭하고, 워싱턴대학교에서 실시된 사례 조사를 토대로 비내진중심가새골조의 대표적인 접합부인 쉬어탭 공유 용접접합부를 갖는 골조의 내진 거동에 대한 유한요소모델을 제시하고 검증하였다. 이 모델을 이용하여 특수중심가새골조와 대비되는 비내진중심가새골조의 연성 능력, 강도, 비탄성 변형 능력에 대해 규명하여 내진 성능을 평가하였다. Special concentrically braced frames(SCBFs) have distinctive advantages in considerable seismic performance, which make engineers widely use SCBFs as lateral-load resisting systems in buildings and have researchers to develop SCBFs design methods. Compared to the extensive research of SCBF, comparatively little information is currently available on the performance of SCBFs designed and constructed before the early 1990's. Prior to 1988, concentrically braced frames(CBFs) design requirements were substantially less restrictive. As a result, many existing structures designed to these requirements may not ensure ductility and pose a significant concern in current buildings. In this study, these older frames are referred as non-seismic braced frames(NCBFs). In order to investigate the seismic behavior of NCBFs, finite-element(FE) models of SCBF and NCBF were suggested and verified using case investigation of NCBF conducted on the University of Washington. Using these models, the seismic behavior of NCBF with shared welding shear tab, which is the representative of the types of connections, was established and compared with the seismic performance of SCBF.
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박재우,염희진,유정한 한국강구조학회 2013 International Journal of Steel Structures Vol.13 No.4
This paper presents the experimental and analytical results of axially loaded stub columns of slender steel hollow squaresection (SHS) strengthened with carbon fiber reinforced polymers (CFRP) sheets. The total eight specimens were fabricatedand the main parameters were: width-thickness ratio (b/t), the number of CFRP ply, and the CFRP sheet orientation. From thetests, it was observed that two sides would typically buckle outward and the other two sides would buckle inward. A maximumincrease of 33% was achieved in axial-load capacity when 3 layers of CFRP were used to wrap HSS columns of b/t=100transversely. Also, stiffness and was compared between un-retrofitted specimens and retrofitted specimens. To extend and betterunderstand the experimental work, a companion analytical study (FEM study) was conducted. The comparisons betweenexperimental observations and computed results show that the analyses provided good correlation to actual behavior.
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정은비,염희진,유정한,Jung, Eun Bi,Yeom, Hee Jin,Yoo, Jung Han 한국강구조학회 2015 韓國鋼構造學會 論文集 Vol.27 No.4
콘크리트 충전형 합성기둥(Concrete filled steel tube, CFT)은 철근콘크리트, 강구조보다 뛰어난 변형 능력과 강도 갖고 있다. CFT 현장타설말뚝은 지진하중, 토양액상화 등에 의해 큰 국부전단력을 경험하게 되며 이를 방지하기 위해 큰 직경으로 설계되어 진다. 그러나 현행 기준의 전단 설계식은 CFT의 구속효과를 고려하지 못하고 있으며, 상당히 보수적인 설계식을 제시하고 있다. 전단 설계식의 개선을 위한 선행 전단 실험연구가 거의 없으며 그조차 소구경의 실험연구로만 존재한다. 이 연구는 대구경 콘크리트 충전형 합성기둥의 개선된 전단 설계식을 제안하기 위한 기초연구로써, 원형 CFT 기둥 전단의 선행 실험연구와 현행 설계기준 비교분석을 실행하였다. Concrete filled steel tube(CFT) has outstanding deformation capacity and strength in comparison with reinforced concrete or steel tube. CFT drilled shaft, which is developed large shear force due to seismic load and soil liquefaction, is designed as large diameter. However, shear design equations of the current standards do not consider bond stress of CFT and it results in extremely conservative design. Currently, previous studies for improving shear equations scarcely exist and are impossible applied to large CFT drilled shafts since these studies focus on only small scale experimental research. In this study, eventually to propose improving shear equation of large diameter CFT, it is preliminary research to compare and investigate the previous studies and current standards.
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대구경 콘크리트 충전형 합성기둥의 전단성능에 관한 해석적 연구
정은비,염희진,유정한,Jung, Eun Bi,Yeom, Hee Jin,Yoo, Jung Han 한국강구조학회 2015 韓國鋼構造學會 論文集 Vol.27 No.5
콘크리트 충전형 합성강관(Concrete Filled steel Tube, CFT)는 우수한 연성과 강도를 발휘하며 건축물의 기둥 및 해양구조물의 교각 등에 적용되고 있다. 현존하는 CFT 전단 설계식은 지나치게 보수적이며 이는 CFT의 경제성과 시공성에 영향을 미친다. 그러나 합리적인 전단 설계식 제안을 위한 실험 연구는 거의 존재하지 않는다. 이 연구는 원형 콘크리트 충전 강관의 개선된 전단 설계식을 제안하기 위한 해석적 연구이다. 선행 연구에서 제시한 원형 CFT 해석 모델을 참고하여 해석 연구를 수행하였으며 해석 모델은 기존 실험 연구 결과를 이용하여 검증하였다. 검증된 모델을 이용하여 변수 연구를 수행하였으며 전단성능에 끝단길이, 콘크리트의 압축강도, 직경두께비가 미치는 영향을 평가하였다. Concrete filled steel tube(CFT), which has superior ductility and strength, is used for building column, bridge piers of ocean structure. Shear design equations of CFT existing in structural design provisions are excessively conservative. It has an effect on constructability and the economics of CFT. However, to suggest the reasonable shear design equation, experimental studies on the shear capacity of CFT have been rarely conducted. This study is analytical research to suggest improved shear design equations of large-diameter concrete-filled steel tubes. This analytical research was conducted to apply finite element analysis model of CFT based on the prior research. It was verified by comparison with prior test results. The verified model was used for parameter studies to estimate the influence of overhang length, concrete compressive strength and diameter-thickness ratio on shear strength.
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