김상대 교수

The steel-concrete composite column is a new composite member that can achieve constructability and economy by filling the empty space in the steel H-flange with concrete. Even before this study was conducted, it had been proven in another study on the axial capacity of a steel-concrete composite column that the steel-concrete composite column with a non-compact section has excellent structural strength. Further studies on flexural-compressive capacity are necessary, though, due to the structura

Spontaneous spinal subdural hematoma (SDH) is an uncommon cause of acute spinal cord compression. When it does occur, however, it may have disastrous results and a poor prognosis. The nontraumatic acute spinal SDH usually results from a defect in a hemostatic mechanism (such as coagulopathy or the use of anticoagulant therapy) or from iatrogenic causes (such as spinal puncture). Fibromuscular dysplasia (FMD) is a nonatherosclerotic systemic arteriopathy of unknown cause that typically affects th

In an oxygen-depleted environment, endothelial cells initiate an adaptive pattern of synthesis, which may enable them to survive hypoxic crises. Using high-resolution two-dimensional gel electrophoresis in conjunction with mass spectroscopy, we obtained a 24 differential display of proteins in the pancreatic endothelial cell line, MS-1, at four time points following induction of hypoxia. The induction of Wee1 under hypoxia was confirmed both at the mRNA and protein levels. The phosphorylation of

Pushover analysis is commonly used to evaluate the inelastic ultimate capacity of structures. However, pushover analysis is carried out based on constant distributions throughout the incremental analysis, which cannot capture the variation in the acceleration profile due to inelastic behavior. For this reason, when plastic hinges form in structure, constant distributions of lateral forces cannot be used any longer. Conventional dynamic inelastic method by time-history analysis can be used for sp

Buckling-Restrained Brace is composed of brace core and constraining member for the purpose of restraing the buckling of brace and providing large inelastic deformation of the member. Constraining member such as steel tube wrap around the brace core prevents the buckling of brace core by means of its flexural resistance, and makes sure that the brace members dissipate a large quantity of energy and form stabilized hysteresis behavior. In this study, to examine the component capacity of the buckl

The purpose of this study is to evaluate the fire resistance of iTECH beam system, which is partly encased by the concrete, under various fires. The temperature distribution of iTECH beam under two fire conditions were analyzed by using the finite element program in this study. ISO standard fire and Eurocode parametric fire were adopted for the target fire conditions. The load-carrying capacity of iTECH beam under fire was evaluated according to Eurocode 1 part 2.2. to analyze the contributions

Steel-concrete composite column is a new composite column system, where links are welded between two flanges of H-shapes steel, and concrete is filled in space between two flanges. In this study, SC composite column composed of the noncompact section was tested in order to estimate its axial compressive capacity. The parameters of test were composite effect, the space of link, width-thickness ratio, and the shape of link. The results showed that SC composite column composed of the noncompact sec

철골-콘크리트 합성 기둥(이하 SC 합성 기둥)은 철골 플랜지 사이를 연결재로 용접하고 , 이런 플랜지 사이에 콘크리트를 채워시공성과 경제성을 얻을 수 있는 새로운 합성 부재이다 . 이 연구의 전단계로서 비조밀단면을 사용한 SC 합성 기둥의 축력 실험을 통해 구조 내력이 우수하다는 것을 입증하였으나 , 기둥의 특성상 축력과 휨을 동시에 받고 있기 때문에 후속 실험 연구가 필요하게 되었다 . 따라서 일정 축력을 받는 비조밀단면을 가진 SC 합성 기둥의 휨 성능을 강축 및 약축 방향으로 실험을 실시하여 각국 기준식과 비교하여 분석하였다 . 실험 결과 모든 방향에 대해서 각국 기준식에서 제시하고 있는 축력 -휨 모멘트 내력식을 만족하는 결과를 보이고 있었다 . 특히 AISC-LRFD 기준. 또한 추후 SC 합성 기둥의 축력-휨 모멘트 내력식은 EC4 기준식으로 산정하는 것이 철골과 콘크리트의 적합 조건을 고려하지 않은 일본 기준식과 약축 방향 내력을 산정하기 어려운 ACI 기준식보다는 바