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국부좌굴과 뒤틀림좌굴이 발생하는 종방향 보강재로 보강된 강판의 압축강도
박호상,서상정,권영봉,Park, Ho-Sang,Seo, Sang-Jung,Kwon, Young-Bong 한국강구조학회 2010 韓國鋼構造學會 論文集 Vol.22 No.3
This paper describes an experimental research on the structural behavior and the ultimate strength of longitudinally stiffened plates subjected to local, distortional, or mixed-mode buckling under compression. The stiffened plate undergoes local, distortional, or interactive local-distortional buckling according to the flexural rigidity of the plate's longitudinal stiffeners and the width-thickness ratios of the sub-panels of the stiffened plate. A significant post-buckling strength in the local and distortional modes affects the ultimate strength of the longitudinally stiffened plate. Compression tests were conducted on stiffened plates that were fabricated from 4mm-thick SM400 steel plates with a nominal yield stress of 235MPa. A simple strength formula for the Direct Strength Method based on the test results was proposed. This paper proves that the Direct Strength Method can properly predict the ultimate strength of stiffened plates when the local buckling and distortional buckling occur simultaneously or nearly simultaneously. 본 논문에는 압축력을 받는 국부좌굴, 뒤틀림좌굴 및 두 좌굴의 혼합좌굴이 발생하는 종방향 보강재가 부착된 강판의 거동 및 극한 강도에 대한 실험적인 연구를 서술하였다. 압축력을 받는 보강판의 경우 서브패널의 폭-두께비와 보강재의 휨강성에 따라서 국부좌굴, 뒤틀림좌굴 또는 두 좌굴의 혼합형태의 좌굴이 발생하게 되고, 상당한 크기의 후좌굴강도가 발현되어 보강판의 극한강도를 지배하게 된다. 보강재의 휨강성과 보강재로 구분된 서브패널의 폭-두께비가 다른 두께 4.0mm, 공칭항복강도 235MP인 SM400 강판으로 제작된 보강판의 중심압축실험을 수행하고 유한요소해석결과와 비교하여 검증하였다. 실험 결과에 근거하여 보강판의 극한강도를 예측할 수 있는 직접강도법을 적용한 설계압축강도식을 제안하였다. 제안된 직접강도법은 뒤틀림좌굴 또는 국부좌굴과 뒤틀림좌굴이 혼합하여 발생하는 종방향 보강재로 보강된 강판의 극한강도를 적절하게 예측할 수 있는 것으로 판단되었다.
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국부좌굴이 발생하는 H-형강 휨부재의 강도에 관한 연구
서건호,서상정,권영봉,Seo, Gun-Ho,Seo, Sang-Jung,Kwon, Young-Bong 한국강구조학회 2011 韓國鋼構造學會 論文集 Vol.23 No.6
This paper describes the moment capacity of flexural members with local buckling based on a series of FE and experiment results. Thin-walled flexural members undergo local, lateral-torsional, or interactive buckling according to the section geometries and lateral boundary conditions. Flexural members with large width-to-thickness ratios in the flanges or the web may undergo local buckling before lateral-torsional buckling. Local buckling has a negative effect on the flexural strength based on the lateral-torsional buckling of flexural members. This phenomenon should be considered in the estimation of the flexural strength of thin-walled sections. Flexural members with various width-to-thickness ratios in their flanges and web were analyzed. Initial imperfections in the local buckling mode, and residual stresses, were included in the FE analyses. Simple bending moment formulae for flexural members were proposed based on the FE and test results to account for local and lateral-torsional buckling. The proposed bending moment formulae for the thin-walled flexural members in the Direct Strength Method use the empirical strength formula and the grosssection modulus. The ultimate flexural strengths predicted by the proposed moment formulae were compared with the AISC (2005), Eurocode3 (2003), and Korean Highway Bridge Design Specifications (2010). The comparison showed that the proposed bending moment formulae can reasonably predict the ultimate moment capacity of thin-walled flexural members. 본 논문에는 국부좌굴이 발생하는 휨부재의 유한요소해석 및 실험에 근거한 단면의 휨강도에 대하여 기술하였다. 박판으로 구성된 휨부재는 단면조건 및 횡방향 경계조건에 따라서 국부좌굴, 횡-비틀림좌굴 및 두 좌굴의 혼합좌굴이 발생하게 된다. 플랜지나 복부의 폭-두 께비가 큰 경우 횡-비틀림좌굴 발생 이전에 국부좌굴이 발생하며, 국부좌굴은 휨부재의 횡-비틀림좌굴강도에 영향을 미치게 된다. 이런 현상은 박판 형강의 휨강도 산정 시 고려하여야 한다. 다양한 폭-두께비를 갖는 플랜지와 복부판으로 구성된 휨부재의 해석에 국부좌굴 및 횡좌굴 모드의 초기처짐 및 잔류응력을 포함하였다. 해석결과 및 실험에 근거하여 국부좌굴과 횡-비틀림좌굴을 고려하는 설계강도식을 제안하였다. 제안된 직접강도법은 실험에 근거한 강도식과 유효단면 대신 총단면의 단면계수를 사용한다. 제안된 강도식에 의한 휨강도를 AISC, EC3 및 도로교설계기준과 비교하여 보았다. 제안된 직접강도법은 국부좌굴과 횡-비틀림좌굴의 혼합 유무와 상관없이 휨부재의 휨강도를 적절하게 예측할 수 있는 것으로 판단되었다.
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혈변으로 내원하여 발견된 Cronkhite-Canada Syndrome 증례 1예
이현지 ( Hyun Ji Lee ),박상정 ( Sang Jung Park ),최혁순 ( Hyuk Soon Choi ),금보라 ( Bora Keum ),서연석 ( Yeon Seok Seo ),김용식 ( Yong Sik Kim ),진윤태 ( Yoon Tae Jeen ),이홍식 ( Hong Sik Lee ),전훈재 ( Hoon Jai Chun ),엄순호 ( So 대한장연구학회 2011 Intestinal Research Vol.9 No.3
Cronkhite-Canada syndrome (CCS) is a rare, non-familial hamartomatous polyposis syndrome characterized by multiple polyps in the entire gastrointestinal tract, nail dystrophy, skin pigmentation, and systemic alopecia. The clinical symptoms of this syndrome include diarrhea, abdominal pain, and alopecia often accompanied by taste disturbances, hypoalbuminemia, recurrent infections, nutritional absorption disturbances, heart failure, and gastrointestinal bleeding. We report a patient with CCS who was admitted complaining of hematochezia, melena, and a 1 month history of diarrhea, nail changes, taste disturbances, and alopecia. Upper endoscopy, colonoscopy, and capsule endoscopy were performed and showed numerous polyps in the stomach, small intestine, and large intestine. Histological sections of these polyps showed edematous stroma and cystically dilated foveolar epithelium, which was consistent with CCS. We diagnosed CCS based on the clinical symptoms and the histological findings of the polyps found via endoscopy. We report on this case and review this syndrome. (Intest Res 2011;9:238-242)
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재발한 혼합 간세포 담관상피암종 및 저혈관성 간세포암종 동시 절제 1예
김태형 ( Tae Hyung Kim ),엄순호 ( Soon Ho Um ),박상정 ( Sang Jung Park ),박승운 ( Seung Woon Park ),이한아 ( Han Ah Lee ),서연석 ( Yeon Seok Seo ),유영동 ( Young Dong Yu ),김동식 ( Dong-sik Kim ),김주영 ( Joo Young Kim ) 대한간암학회 2017 대한간암학회지 Vol.17 No.1
Liver cancer is more complex to treat compared to cancers in other organs, since liver function should be considered. In addition, only a few patients can be applied curative treatment due to advanced stage at diagnosis. Therefore, early stage detection is important and has been increased through screening and surveillance programs using image modalities recently. However, it is still difficult to diagnose small or hypovascular hepatocellular carcinoma (HCC) even using advanced image modalties. In particular, hypovascular HCCs do not show arterial contrast enhancement which is a typical finding of HCC on computed tomography (CT) and magnetic resonance imaging (MRI). Those also account for a considerable portion of early HCC. We present 54 years-old man who had recurrent hypervascular and hypovascular nodules on three phase CT and gadoxetic acid-enhanced MRI. The nodules were removed by surgical resection and confirmed as combined hepatocellular-cholangiocarcinoma and well differentiated HCC respectively. (J Liver Cancer 2017;17:94-99)
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