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이철호 한국지진공학회 2005 한국지진공학회논문집 Vol.9 No.2
용접 철골 모멘트접합부는 일반적으로 평면유지의 가정을 전제한 초등휨이론에 의해 설계되어 왔다. 그러나 1994년 노스리지 지진 이후 보-기둥 접합부의 설계에 초등휨이론을 적용하는 것은 타당치 않음이 몇몇 연구자에 의해 제기된 바가 있다. 본 연구에서는 필자의 최근 해석 및 실험연구를 주 근거로 하여 다양한 형식의 접합부의 응력전달 메커니즘을 재평가하고, 거의 모든 용접 모멘트접합부의 설계에 초등휨이론을 적용하는 것이 부적절함을 보이고자 하였다. 보의 웨브, 수평헌치의 웨브, 리브 등과 같은 수직 플레이트 접합요소는 모두 스트럿 작용에 의해 응력을 전달하는 유사성이 있음을 해석적, 실험적으로 확인하였다. 또한 최근 가장 큰 주목을 받고 있는 고연성 RBS 접합부의 전단력 응력전달 메커니즘은 PN형식 접합부의 그것과 크게 다르지 않음을 확인하였다. 아울러 접합부 설계에 유용하게 활용될 수 있는 단순화된 해석적 응력전달 모형을 소개하였다. Employing the classical beam theory for the design of welded steel moment connections has been brought into question by several researchers since the 1994 Northridge earthquake. In this study, the load transfer mechanism in various welded steel moment connections is comprehensively reviewed mainly based on recent studies conducted by the writer. Available analytical and experimental results showed that the load path in almost all the welded steel moment connections is completely different from that as predicted by the classical beam theory. Vertical plates near the connection such as the beam web, the web of the straight haunch, and the rib act as a strut rather than following the classical beam theory. The shear force transfer in the RBS connection is essentially the same as that in PN type connection. Some simplified analytical models that can be used as the basis of a practical design procedure are also presented.
전단경간비가 작은 철근콘크리트 보의 휨-전단 상관 관계
양근혁(Yang Keun-Hyeok),이영호(Lee Young-Ho),은희창(Eun Hee-Chang),정헌수(Chung Heon-Soo) 대한건축학회 2003 大韓建築學會論文集 : 構造系 Vol.19 No.4
There have been a number of experimental and theoretical investigations to establish a flexural-shear interaction model of reinforced concrete beam without shear reinforcements. Their researches were confined to normal beam of shear span-to-depth ratio (a/d) greater than 1.0. In these models, the relative flexural capacity ratio have been proposed by 1.0 in range a/d≤1.0. However, the mechanical behavior of reinforced concrete beam that a/d is small is significantly governed by the shear rather than the flexure. Therefore, the purpose of this study is that present flexure-shear interaction model to grasp reduction of flexural capacity by effect of shear in beam that a/d is less than 1.2. Based on the existing experimental results, it was observed that the relative flexural capacity ratio decreases with the decrease in the a/d unlike the other models. Also, considering the strut and tie action of short beam, a flexure-shear interaction model of short beam was proposed as a function of a/d, fck, p, fy, and h. Comparison with experimental results illustrated the validity of the proposed model.