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양원직,이원호,Yang. Wonjik,Yi. Waonho 한국방재학회 2013 한국방재학회논문집 Vol.13 No.6
최근 전 세계적으로 지진의 발생빈도가 증가하는 경향을 보이며 일부는 지진해일을 동반한 대규모 피해가 발생하고 있다. 2004년 12월 26일 인도네시아 수마트라 지진해일은 약 30만명의 인명피해와 100억 달러 이상의 재산피해가 발생하였으며, 2011년 3월 11일 일본 동북지방 태평양 연안 지진해일은 15,800여명의 인명피해와 25조엔 이상의 재산피해가 발생했다. 이러한 추세에도 불구하고 국내에서는 지진해일에 대한 국내 건축물의 대비책은 전무한 실정이다. 따라서 본 연구에서는 해일에 의한 건축물의 안전성 평가를 위하여 해일의 파력 및 건축물의 내력 평가방법을 소개한다. 또한 국내 건축물에 80%이상을 차지하고 있는 연안가 조적조 건축물에 대한 안전성을 침수심 깊이에 따라 평가하였다. The tsunami that hit Indonesia on December 26, 2004 took the lives of about 300,000 people and caused massive property damage amounting to more than 10 billion dollars. Another earthquake hit the northeastern coast of Japan on March 11, 2011 and triggered a tsunami that battered Japan`s coast, killing 15,800 and causing property damage amounting to 25 trillion yen. Despite this trend, no feasible actions have been taken on the buildings in Korea to reduce tsunami-induced damage. Therefore, this study will present the method of building`s resistance force evaluation and wave force for the building`s safety for the tsunami. Then, according to the inundation depth we examined the safety evaluation of masonry buildings in the shore that occupy more than 80% in Korean buildings.
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계획적 불놓기에 의한 산불위험 저감에 관한 실험적 연구
류주열(Ryu, Juyeol),양원직(Yang, Wonjik) 한국방재학회 2021 한국방재학회논문집 Vol.21 No.2
미국, 호주, 유럽, 일본 등의 국외 여러 나라에서는 산림 내의 연료를 처리하는 계획적 불놓기를 주요 산불 예방관리 도구로 활용하고 있지만, 현재 국내에서는 적용되지 않고 있다. 따라서, 본 연구에서는 국내에 산불 예방관리 기법인 계획적 불놓기의 적용을 위해 국외 계획적 불놓기의 적용 현황과 적용 방법을 살펴보고, 연구대상 구역을 선정하여 시뮬레이션을 통해 국내적용 가능성을 평가하였다. 계획적 불놓기와 산불재현 시뮬레이션을 수행한 결과, 계획적 불놓기를 통해 분할된 불놓기(1차, 2차, 3차점화)를 적용하면 산불재현 보다 시간경과에 따라 평균 연소면적이 26.6% 감소되어 안전하고 효과적인 연소가 이루어지는 것을 확인하였다.. Many countries, such as the United States, Australia, and Japan, use prescribed fire to treat fuel in forests as their primary wildfire prevention and management tool. However, to date we have not applied such method in our country. Therefore, in this research, we investigate the current status and method of prescribed fire for application. Then, the research target area was selected, and the possibility of the domestic application was evaluated through a prescribed fire and wildfire reproduction simulation. Our simulation results showed that a split fire drop (1st, 2nd, and 3rd fire) using the prescribed fire reduced the burning area by 26.6% compared to wildfire reproduction. We confirmed that the prescribed fire was carried out safely and effectively.
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Lee, HooChang,Hwang, BoKyung,Yang, WonJik,Kim, TaeSoo Elsevier 2019 Thin-Walled Structures Vol.141 No.-
<P><B>Abstract</B></P> <P>In this paper, the block shear fracture behavior of base metal in austenitic stainless steel (STS304, corresponds to ASTM 304 type) fillet-welded connection has been investigated through experimental and numerical methods. Even though the block shear fracture strength of welded connection thanks to stress triaxiality effect differs from those of bolted connection under monotonic tension, block shear strength equations of welded connection with base metal fracture in the design codes are identical to those of bolted connection. Main variables are weld method (TIG and Arc welding) and weld length (transverse and longitudinal to the direction of loading). It is found from study results that welding method did not affect the strength of welded connection. Block shear strengths by current codes (KBC2016, AISC2016 and EC3 1–3) and other researchers’ proposed equations were compared with those of experimental results and finite element analysis results. Finite element analysis (FEA) model was developed based on previously test data. Also, parametric study for investigating the weld length effect on strength has been performed with the developed finite element analysis procedures. Consequently, condition of weld length and end distance perpendicular to the direction of applied force for fracture mode transition boundary from tensile fracture to block shear fracture in welded connection was investigated. In addition, block shear strength equation with modified tensile stress and shear stress factors of base metal fracture in austenitic stainless steel (STS304) welded connection is suggested considering stress triaxiality.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Finite element analysis of stainless steel welded connections was conducted. </LI> <LI> Strength and fracture mode by analysis agreed with those of test results. </LI> <LI> Specimens failed by block shear fracture of base metal. </LI> <LI> Condition of fracture transition according to variables were investigated. </LI> <LI> Effective tensile and shear stress factors were suggested. </LI> </UL> </P>
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