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김재곤(Jae-Gon Kim),이현수(Hyun-Soo Lee),박문서(Moon-Seo Park),진종민(Jong-Min Jin) 한국구매조달학회 2011 한국구매조달학회지 Vol.10 No.2
최근 철근 가격의 급등에 따른 공사비 증가를 줄이기 위해 가공 손실을 줄이려는 다양한 시도가 진행되었다. 공장가공이 활성화되는 점이 대표적인 예라 할 수 있고, 철근가공도 및 배근시공도 표준화, 고강도철근 사용, 코일철근(Bar in coil) 도입도 이에 포함된다. 이 가운데 코일철근은 공장가공이 필수적으로 필요하고, 가공장비의 고가 등의 이유로 일본, 대만 등에서 수입하여 일부 현장에서 사용되어 왔으나, 극히 일부 현장에 국한되어 적용되었다. 그러나 올해부터 국내 D제강사에서 코일철근을 생산, 건설현장에 적용되기 시작하여 기존 철근가공 산업에 영향을 줄 것으로 예상된다. 본 논문에서는 기존 철근가공 방식 및 코일철근의 특성 조사와 코일철근의 적용에 따른 철근가공 산업의 변화를 예측해보고, 그 의의를 분석해보고자 한다. Lately, there were various attempts to decrease the increased cost of construction according to the speedy rise of rebar price by reducing rebar loss during manufacturing phase. The fact that the proportion of rebar factory manufacturing is increasing gradually is a notable example; and the standardization of shop drawing and placing drawing, the use of super high-strength rebar, and the application of Bar in Coil (BIC) are also included in the attempts. BIC has been used by importing from foreign countries like Japan or Taiwan, but the case is very rare because it should accompany rebar factory manufacturing system and high cost of manufacturing equipment. However, BIC has been produced in ‘D’ steel mill high cost of manufacturing equipment. However, BIC has been produced in ‘D’ steel mill and used in some construction site; and it is expected to influence the rebar manufacturing industry. In this study, inquiries on the current rebar manufacturing system and BIC’s characteristics are conducted; then, the prediction of the changes of rebar work industry and the meaning of BIC’s application are implemented.
엄태성(Eom, Tae-Sung),최태우(Choi, Tae-Woo),박홍근(Park, Hong-Gun),강수민(Kang, Su-Min),진종민(Jin, Jong-Min) 대한건축학회 2013 大韓建築學會論文集 : 構造系 Vol.29 No.2
For reduction in steel weight and duration of reinforcement work, continuous hoops can be used as the lateral reinforcement of reinforced concrete columns. In the present study, seismic tests were carried out in order to verify the earthquake resistance of the columns reinforced with continuous hoops. According to KCI 2012, the column specimens were designed with high strength SD600 and SD500 steel bars for the longitudinal and lateral reinforcements, respectively. The test results showed that the load-carrying capacity and deformation capacity of the column specimens confined with various details of continuous hoops were comparable to those of the column confined with conventional tie hoops and crossties with seismic hooks. In addition, a close investigation on the longitudinal bar buckling occurring at the plastic hinges of the columns showed that sway and/or non-sway buckling modes of longitudinal bars can be significantly influenced by the spacing and diameter of lateral reinforcement. In the present study, the lateral reinforcement spacing restraining premature longitudinal bar buckling was proposed and the proposed method was compared with the test results. Based on the proposed method, the requirements on the lateral reinforcement spacing of columns specified in KCI 2012 and ACI 318-11 were examined.