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변근주,Byeon, Geun-Ju 한국건설안전협회 1995 建設 安全技術 Vol.15 No.-
다음은 지난 1월 24일 열린 ‘전문건설 신기술 세미나’에서 연세대 변근주 교수 (우리 협회 비상근전문위원)가 주제발표한 내용으로 이에 소개한다.
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김영진,노병철,장세창,변근주 연세대학교 산업기술연구소 1991 논문집 Vol.23 No.2
In recent years, considerable interest has developed in the fatigue strength of reinforced concrete members subjected to cyclic loading for the wide-spread adoption of ultimate strength design procedures, the higher strength materials and the new recognition of the effect of repeated loading on structures such as bridges, concrete pavements and offshore structures. In this study, a series of experiments is carried out to investigate the fatigue characteristics of deformed bars and underreinforced simply supported beams, The 69 reinforcing bar specimens with grade SD30 and designation of D16, D22, D25, and 24 beam specimens with D16 bars are prepared for this study. From these series of tests, it is found that ⅰ) the decrease of the bar diameter results in increased fatigue life, ⅱ) the fatigue life of the bars embedded as main reinforcement within a concrete is longer than that of bars in the air. ⅲ) the fatigue strength of beams at ?? cycles with steel ratio of 0.61% and 1.22% is 64.5% and 63.2% of the yielding strength, respectively. It is concluded that the low steel ratio has no significant effect on fatigue strength of underreinforced beams and the fatigue life underreinforced concrete beams can be predicted conservatively by the fatigue life of reinforcing bar.
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ADS알고리즘을 이용한 철근콘크리트 사각형암거의 최적설계
김영진,이상민,이승훈,변근주 연세대학교 산업기술연구소 1990 논문집 Vol.22 No.1
The objective of this study is to optimize the section of RC box culverts and develop a CAD system for drawing. This paper consists of three parts. In the first part, the external load conditions are systematized by using the literatures and specifications. In the second one, the RC box culvert is optimized using the SUMT algorithm. Sizing variables and steel ratio are taken as design variables, and a cost function as the objective function. The stress and side constraints are derived from the Korea Concrete Specification for the ultimate strength design. Finally, a data base and CAD system is developed for the drawing of the optimized section of RC box culverts. The ADS algorithm is applied to one cell box culverts and the results are compared with those of conventional method.
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