매립형 SRC 기둥재의 변형성능에 대한 축력의 영향

정진안,양일승,최성모,Chung, Jin-An,Yang, Il-Seung,Choi, Sung-Mo 한국강구조학회 2003 韓國鋼構造學會 論文集 Vol.15 No.3

본 논문은 매립형 SRC기둥의 축력과 변형능력과의 관계를 찾아내기 위하여 해석적인 연구를 수행하였다. 해석 모델은 캔틸레버기둥으로 한정하였으며 SRC 기둥의 비탄성 거동에 영향을 미치는 변수들인 철골비, 매립철골형상과 전단스팬과 춤과의 비에 대하여 검토하였다. 일정회전각하에 축력과 반복수평력을 받는 SRC기둥의 안정적 거동을 보장하기 위한 최대한계축력이 있다는 것을 해석결과들은 보여 주고 있다. 반복 횡하중을 받는 기둥이 저항할 수 있는 최대축력은 소요회전각을 보장하는 안정한계축력으로서 정의된다. 해석결과에 따르면 안정한 계축력비는 강재의 강도가 증가함에 따라 콘크리트의 강도가 감소함에 따라 증가하는 것으로 나타났다. 또한 I형 단면이 매립형 철골로 사용될때 철골 단면적이 증가함에 따라 안정한계 축력비는 증가하며, 십자형 단면이 사용되는 경우에는 단면적에 의한 영향이 거의 없었다. In this paper, an analytical approach hwas been conductsed to clarify the relationships between the axial force and the deformation capacity of steel- encased reinforced- concrete beam-columns. The analytical model was defined as a cantilever. Several parameters influencing the inelastic performance of the beam-columns were selected, as follows: including encased steel area ratios, and sectional shapes of the encased steel, material strengths, and shear-span- to-depth ratios. The Analytical results of the analysis showed that the axial force had to have a maximum limit to ensure the stable behavior of a steel- encased reinforced- concrete beam-column when it was subjected to both axial and repeated lateral loading under a constant rotation angle amplitude. The maximum axial force of the beam-column to be resisted under cyclic lateral loading was defined as the stable-limit axial force to ensure the required rotation angle amplitude. The Analytical results of the analysis indicate that the stable-limit axial load ratio increases as the steel strength increases or as the compressive strength of the concrete decreases. The stable-limit axial load ratio decreases as the encased steel ' s sectional area increases in the case of a 1-shaped sections and it is almost not influenced by the steel sectional area in the case of a cross-shaped section.

모살용접을 사용한 각형강관기둥-H형강보 모멘트 접합에 관한 실험적 연구

정진안(Chung Jin-An),서성연(Suh Sung-Yeon),최성모(Choi Sung-Mo) 대한건축학회 2004 大韓建築學會論文集 : 構造系 Vol.20 No.5

In seismically active regions such as Japan, most of steel structures are constructed using moment resisting frames<br/> that are composed of square tubular section columns and H-shaped beams. Through-type diaphragm was widely used in<br/> the case of beam-to-box column connection in spite of theirs complexity of fabrication. The Hyogoken-Nanbu earthquake<br/> in 1995, however, caused very severe damage to through-type diaphragm. Most of through-type diaphragm connections<br/> were damaged in both welding part of beams and columns. On the other hand, outer diaphragm have merit of reducing<br/> the process of fabrication, because it is not need the cutting of the column to connect, and of convince of assuring<br/> concrete compactness of concrete filled-steel tubular columns.<br/> This study focuses on the development of a new connection method of H-shaped beam-to-square tubular column<br/> connections. The connection method using external stiffener of outer diaphragm was presented. A specific type of<br/> H-shaped beam-to-square tubular column connections with vertical stiffener has been experimentally studied under cyclic<br/> loading. Six test specimens were tested at the structural Laboratory of Kyushu University. The structural performance of<br/> the test specimens is discussed well as resulting conclusions.

콘크리트 충전강관 3층 골조의 탄소성 거동에 관한 연구

정진안(Chung. Jin-An),최성모(Choi. Sung-Mo) 대한건축학회 2004 大韓建築學會論文集 : 構造系 Vol.20 No.7

Three story and one span concrete filled steel tubular frames were tested under the constant axial load and alternately<br/> cyclic horizontal loads in order to investigate the seismic performance of multi story CFT frames. The effects of the<br/> main experimental parameters which were the two column type (vacant column, CFT column), the two beam-to-column<br/> connections (external diaphragm connection type and vertical stiffener connection type) and the two steel shear walls<br/> type are discussed on the elastic-plastic behavior of CFT frames. These results showed that 1st story column of CFT<br/> frames had large ductile, whereas that of vacant steel tube frame were observed local buckling at column top and bottom<br/> and the frame strength decreased rapidly. In addition, it was verified that the vertical stiffener connections had good<br/> structural performance and steel shear wall was an effective device to improve strength and stiffness.

내지진강관의 특성 및 적용사례

정진안(Jin An Chung),전배호(Bae Ho Jeon) 한국강구조학회 2011 韓國鋼構造學會誌 Vol.23 No.5

후쿠오카현 서방향 해역 지진 피해에 관한 조사

정진안(Jin An Chung) 한국강구조학회 2010 韓國鋼構造學會誌 Vol.22 No.2

일본 건축용강재 인증제도 소개 및 사례

정진안(Jin-An Chung),정미영(Mi-Young Jung),이호준(Ho-Jun Lee) 한국강구조학회 2021 韓國鋼構造學會誌 Vol.33 No.6

연직 스티프너 보강형 각형강관 기둥-보 접합부의 구조적 거동

정진안(Chung Jin-An),최성모(Choi Sung-Mo) 대한건축학회 2004 大韓建築學會論文集 : 構造系 Vol.20 No.4

This paper describes a study on a new connection method for use in steel moment-resisting frames. The connections are<br/> strengthened by vertical stiffeners to connect Square tube column and H-shaped beam. The two loading type tests were<br/> conducted under the experimental parameters given as details. First are described sy㎜etrical loading test that supported the both<br/> ends or a beam simply and applied load from the column top end for investigating a fundamental characteristics of this<br/> connection. Further are given the anti-sy㎜etrical loading test that carries out simple support of the column top end and the<br/> column base, and applied load from the both ends of a beam for investigating structural performance of this connection. To<br/> verify results from tests, a nonlinear analysis for moment-resisting frames composed of square tube column and H shaped beam<br/> was performed using a FE analysis program, ANSYS. It was found that all specimens were able to exceed the capacity<br/> predicted by the full plastic strength of beam. The connections strengthened with vertical stiffeners were successfully verified by<br/> the tests.

주물형 베이스 플레이드를 사용한 합성강관 기둥 노출형 주각의 탄소성 휨거동

정진안(Chung Jin-An),양일승(Yang Il-Seung),최성모(Choi Sung-Mo) 대한건축학회 2003 大韓建築學會論文集 : 構造系 Vol.19 No.2

This paper deals with the experimental work with the objective to gain a better understanding of the elasto-plastic behavior of steel-concrete composite column bases under seismic loading. Seven specimens were tested to investigate structural behavior of steel-concrete composite column bases. The specimen consisted of concrete filled steel tube (CFT) column (or steel tube column), reinforced concrete footing beam, high base unit of cast steel and 4 high strength anchor bolts. The following main influential elements were taken into consideration: axial load level and type of column (CFT or empty steel tube, rectangular section or circular section). Specimens were subjected to cyclic seismic lateral loading at the column tops under constant axial load. The cyclic lateral load was applied according to a predetermined sequence of rotation angle cycles of column base. Experimental results verified that the rotation stiffness and flexural strength of CFT column base calculated according to the formulas given by this paper were in coincidence with the test results in cases of lower axial load without reference to the type of column. For the specimens under higher axial load, formulas underestimated their rotation stiffness and flexural strength. The comparison indicates that several modifications should be taken into consideration in column base design formulas of steel structure in order to make effective use of these formulas in CFT column base design, especially for column bases under higher axial load. It is made clear that ultimate flexural strength of this kind column base can be evaluated by ultimate strength with the coefficient of bearing stress of concrete taken into account.

외다이아프램을 사용한 현장용접형 각형강관ㆍH형강보 접합부의 탄소성거동에 관한 연구

정진안(Chung Jin-An),한석종(Han Seok-Jong),양일승(Yang Il-Seung) 대한건축학회 2010 大韓建築學會論文集 : 構造系 Vol.26 No.8

This study focuses on the development of a new method of H-shaped beam-to-square column connection with outer diaphragm with field welding. The specific type of beam-to column connection with external stiffener using field welding is proposed. The structural behavior of this connection is examined experimentally. The two loading type tests are conducted under the experimental parameters given as details. First are described symmetrical loading test that supported the both ends or a beam simply and applied load from the column top end for investigating a fundamental characteristic of this connection. Further are given the anti- symmetrical loading test that carries out simple support of the column top end and the column base, and applied load from the both ends of a beam for investigating structural performance of this connection. From the results, it makes clear that the external stiffener type connection proposed in this paper is reliable connection method.

고강도콘크리트충전 각형강관장주의 내력에 관한 실험적 연구

서성연,정진안,Seo, Seong Yeon,Chung, Jin An 한국강구조학회 2002 韓國鋼構造學會 論文集 Vol.10 No.4

본 논문에서는 고강도콘크리트충전 각형강관장주에 대한 실험결과와 탄소성해석결과를 비교분석했다. 실험체는 모두 고강도콘크리트 충전 각형강관장주로 18개를 제작하였으며, 편심비에 따라 중심 및 편심가력하였다. 본 연구의 주요 파라메타는 단면폭에 대한 유효좌굴 길이의 비($L_K$/D)= 4, 8, 12, 24, 30와 가력편심비(e)=0, k, 3k이다. 본 논문에서 고강도콘크리트 충전 각형강관장주의 내력에 관한 해석 및 실험을 통하여 다음과 같은 결과를 얻었다. $L_K$/D=12 이하의 고강도콘크리트충전 각형강관단주는 콘크리트 감소계수 $c{\gamma}u=0.85$를 고려한 전소성내역에 도달했으나, $L_K$/D=18 이상의 장주실험체는 콘크리트 감소계수를 고려한 전소성내력에 도달하지 않았다. 실험에 의한 고강도콘크리트충전 각형강관장주의 탄소성거동은 제안된 해석치의 종국내력$N_{ASSUMED}$과 비교적 양호한 접근을 보여주었다. 콘크리트 압축강도의 감소계수 $c{\gamma}u=0.85$를 고려하지 않은 CFT설계기준과 고강도 콘크리트를 충전한 각형강관기둥의 실험결과치는 비교적 잘 일치함을 알 수 있었다. In this paper, 18 square CFT columns filled with high-strength concrete were tested under concentric or eccentric axial loading. Two parameters of the experimental program included the buckling length-section depth ratio ($L_K$/D) and the eccentricity of the appled compressive load (e). In additon, mechanical properties such as the compressive concrete strength and compressive and tensile steel strength were measured and incorporated into the material models for the stress-strain relationships of concrete and steel. This model was used in an elasto-plastic analysis in order to predict the behavior of the slender CFT columns. Observtions of the failure mode during the tests under axial loadig were also presented. The strengths obtained from the analysis. Recommendations for Design, and Constructions of CFT structures were presented, as verified by the experimental results.