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순환골재 치환율에 따른 R/C보의 장기처짐에 관한 연구-Ⅱ
윤승조(Yoon Seung-Joe),서수연(Seo Soo-Yeon),이우진(Lee Woo-Jin),강성덕(Kang Seong-Duk),민석환(Min Suk-Hwan) 대한건축학회 2007 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.27 No.1
In this paper, long term deflection of RC beam with variable replacement ratio of recycled aggregate[RA] is investigated. 6 RC beam specimens are designed using concrete made of coarse aggregate[CA] of 25㎜ size, mix strength of 21㎫, slump of 120㎜ and air content of 5.0±1.5%. A few concrete blocks are made and used for long term loading. The loading and deflection instrumentation are conducted following the process codified in ACI 318-05 code. Test result shows that the deflection of specimens with RA replacement ratio 10%, 20% is low compared with normal specimen with natural CA but the specimen with RA replacement ratio 30%, 40%, 50% is higher than the normal specimen.
전단보강재 형태에 따른 플랫플레이트 슬래브-기둥 내부접합부의 뚫림전단강도 성능 평가
윤승조 ( Yoon Seung-joe ),서수연 ( Seo Soo-yeon ),윤용대 ( Yoon Yong-dae ),이우진 ( Lee Woo-jin ),양충모 ( Yang Chung-mo ) 한국구조물진단유지관리공학회 2009 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.13 No.1
The research manufactured test objects of four types (I, J, SR, C) of shear reinforcement bar in order to verify punching shear behavior at a connecting part between slab and column at a typical office building: seven-story building that is 4.2m high in the first floor and 3.6m high from second to seventh floor. The research experiments punching shear behavior at slab-column connecting part under static forging load to evaluate the shear performance.
압축철근에 따른 순환 R/C보의 장기처짐에 관한 실험적 연구
윤승조 ( Yoon Seung-joe ),서수연 ( Seo Soo-yeon ),이우진 ( Lee Woo-jin ),김태호 ( Kim Tae-ho ),김대영 ( Kim Dae-young ) 한국구조물진단유지관리공학회 2006 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.10 No.2
The aim of this study is to evaluate the instant and long-term deflection of reinforced concrete beam made of recycled coarse aggregate. Test specimens are designed to have various compression steel ratio. The uniform load is applied to the specimen according to the ACI’ loading criteria to avoid the arching action. Test results were compared with the predicted deflection by ACI code, Branson's formula and Mayer’s. As a result, it was found that the predicted result by ACI and Mayer’s formula are similar to test value in both immediate elastic deflection and long-term deflection. The deflection of test specimen decreased when the compression steel ratio increased.
헤드 철근을 주근으로 사용한 철근콘크리트 깊은 보의 전단거동에 관한 연구
윤승조(Yoon Seong-Joe),서수연(Seo Soo-Yeon),이우진(Lee Woo-Jin),강경훈(Kang Kyoung-Hun) 대한건축학회 2004 大韓建築學會論文集 : 構造系 Vol.20 No.10
In RC structures, standard hook is the effective anchorage method of the main longitudinal tension reinforcement. But, the use of standard hook results in steel congestion, so that the fabrication of steels would be difficult.<br/> Headed reinforcement offers advantage in reducing the congestion of steels. The objective of this study is to investigate the shear behaviors of reinforced concrete deep beam with headed longitudinal reiniforcement. Ten deep beams are designed to study the anchorage capacity of headed reinforcement as well as the contribution of shear reinforcements and the effect of share span-to-overall depth ratio(a/h).<br/> From the tests, it was shown that headed reinforcement could replace standard 90-degree anchorage as the anchorage method. Based on the test, shear design formulas of ACI 318-99 and AIJ Code were evaluated. The ACI 318-99 Code is shown to be conservative, while the AIJ Code are unconservative.