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표준화재 재하조건에서 법정슬래브의 내화성능에 관한 실험적 연구
조범연(Cho, Bum-Yean),여인환(Yeo, In-Hwan),김흥열(Kim, Heung-Youl),민병렬(Min, Byung-Yeol),김형준(Kim, Hyung-Jun) 한국화재소방학회 2011 한국화재소방학회 학술대회 논문집 Vol.2011 No.추계
본 연구에서는 현재 법정내화구조로 규정되어 있는 철근콘크리트(RC: Reinforced concrete)조 및 철골철망모르타르(SWM: Steel & Wire Mortar)조 슬래브에 대하여 재하조건에서 구조별 내화성능을 검토하고, 철골철망모르타르조 슬래브에 대해서는 피복두께별 내화성능을 검토하고자 표준화재조건에서 내화실험을 실시하였다. 실험결과 동일피복 두께일 경우 철근콘크리트조 슬래브가 내화성능이 우수한 것으로 나타났으며, 철골철망 모르타르조 슬래브의 경우 피복두께가 10mm 증가 시 7%의 내화성능이 향상되는 것으로 나타났다. 가열 이면온도는 슬래브의 두께가 늘어날수록 낮은 것으로 나타났다.
용접한 건축구조용 강재의 고온 시 기계적 특성에 관한 연구
조범연(Cho Bum-Yean),지남용(Jee Nam-Yong) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.12
This research is to show the mechanical properties of structural steels by welding at high temperature. Welding parts are divided with weld metal and HAZ(Heat Affected Zone). HAZ is formed by interval from welding heat source and heating and cooling rates. Then, the change of both microstructure and mechanical properties occurs. Discontinuity of mechanical and chemical property at HAZ is the cause of safety decrease of structure. At this point, in this research, tensile tests at high temperature with test pieces of base metal and weld metal of SS400 and SM490 are accomplished. Furthermore, the effect on steel by welding throughout the microstructure's observation at welding parts and fractural parts. From the results, the mechanical properties of both SS400 and SM490 are standardized without welding or non-welding. Moreover, after tensile tests, The volume fraction of ferrite and pearlite is analyzed with microstructure of fractural parts of test pieces of weld metal. As a result, it is verified that the fragility parts of test pieces of weld metal are base metal.
피복두께에 따른 철골철망 모르타르조 슬래브의 내화성능에 관한 연구
조범연(Cho Bum-Yean),김흥열(Kim Heung-Youl),민병렬(Min Byung-Yeol),김형준(Kim Hyung-Jun),여인환(Yeo In-Hwan) 대한건축학회 2011 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.31 No.2(구조계)
Besides Korea, some foreign countries such as Japan, the United States and Germany describe in their building codes the legal fire resistance structure as a commonly used member at the construction sites, which doesn’t need a investigation of the fire resistance performance. On this, it is required an economic and efficient system improvement based on the evaluation results of the Steel Wire Mortar Structure. This study suggests some ways to improve the domestic legal fire resistance construction, analyzing the national and international criteria related.
조범연(Byoum Youn Cho),배은영(Eun Young Bea),신오순(Oh-Soon Shin) 한국산학기술학회 2022 한국산학기술학회논문지 Vol.23 No.10
계단 내려가기 운동의 효과 검증을 위해 계단 올라가기 및 계단 내려가기가 가능한 기기를 제작하고 10명의 피험자를 모집하여 계단 내려가기 및 올라가기에 실험을 수행하고 카로보넨(Karvonen)의 공식을 활용하여 신체 부하율(운동 강도)을 산출하였다. 또한 보행 시 활성화되는 하지근 5곳에 대해 계단 올라가기 보행 및 계단 내려가기 보행 시의 근 활성도를 EMG 장비를 활용하여 측정하였다. 피험자의 연령대는 다르지만 선행 연구 결과와 마찬가지로 계단 내려가기 보행이 계단 올라가기 보행에 비해 신체 부하율에 적용한 심박수가 낮게 측정되었다. 선행 연구에서는 체지방 및 골밀도와 체력을 향상시키는데 계단 내려가기 보행이 더 효과가 있음을 시사하였고, 본 연구에서는 보행 시 활성화되는 하지근 5곳 중 4곳이 계단 올라가기 보행보다 계단 내려가기 보행에서 활성도가 더 높음을 확인하였다. 본 연구에서는 체지방 및 골밀도의 비교 측정은 한계가 있었으나 체력 향상에 있어서는 보행 시 활성화되는 하지근 5곳 중 4곳의 활성화가 높게 측정됨에 따라 계단 내려가기 운동은 신체 부하를 줄이면서 하지근력 강화 운동에 적합한 운동임을 검증하였고, 이는 계단 내려가기 운동이 급속화되고 있는 고령화 시대에 위험한 낙상에 대한 예방 운동으로 활용될 수 있음을 시사한다. To verify the effects of the stair descending exercises, a device capable of going up and down stairs was fabricated, and 10 subjects were recruited to participate. As part of the experiment, the participants were requested to ascend and descend the stairs. Karvonens formula was used to calculate the load factor (exercise intensity). In addition, the muscle activity of five lower extremity muscles activated during walking was measured using electromyography (EMG) equipment when walking up and down the stairs. Similar to the results of a previous study, going down the stairs was found to cause a lower heart rate applied to the body load ratio than going up the stairs, although the age of the subjects was different. In this study, it was confirmed that four out of the five lower extremity muscles involved were more active while walking down the stairs compared to walking up the stairs. The comparative measurement of body fat and bone density had limitations, but in terms of improving physical strength, the activation of four out of the five lower extremity muscles involved during walking was measured to be high. It has thus been verified that walking down a staircase is an appropriate exercise for strengthening the bodys lower extremity muscles. As a result, it can be used as an exercise to prevent dangerous falls in the aging population.
공동주택에서의 가변성을 고려한 Infill 및 Interface의 성능기준에 관한 연구
조범연(Cho Bum-Yean),이충선(Lee Chung-Seon),지남용(Jee Nam-Yong),박기봉(Park Ki-Bong) 대한건축학회 2007 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.27 No.1
On SI houses in Japan, infill system is used for curtain wall, service system and interior except structure taking charge internal stress. And, it means that part can be changed by residents. Also, for correspond to variety of lifestyle of resident, infill should be easy to set up, dismantle, and move. It is called Interface that is an concept including condition of junctions, regulations. Because of interface, there must be gaps and its may cause deterioration of properties. To reduce the deterioration of properties, the design for Interface should be planned more than that properties of two materials used at junctions. The survey for regulations and standards has conducted and required performance item and performance evaluation method which can be a basic material of performance-standard of infill are reorganized. With this, common features of required performance item of two parts consisting Interface are fixed for required performance item of Interface. As well as, required performance item of Interface has been acquired with containing necessary items which are not included required performance item of Infill. Next, classes of required performance of Interface are summarized according to KS. Therefore, the object of this research is to give the basic information about performance-standard of infill and interface.