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내부그라우팅으로 미세균열이 보수된 철근콘크리트 시공이음부의 역학적 특성에 관한 연구
오병환 ( Oh Byung-hwan ),김세훈 ( Kim Se-hoon ),이근희 ( Lee Keun-hee ) 한국구조물진단유지관리공학회 2003 한국구조물진단유지관리공학회 논문집 Vol.7 No.1
Grouting internally with grout materials can repair the micro-cracks and micro-voids of construction joints more efficiently than injecting grouts from the surface of cracks. A new internal grouting method using perforated bundled-cables was developed in this study to enhance the structural integrity of the construction joints. The extensive experiments were performed to examine the mechanical behavior of construction joints which are repaired internally by the developed method. The tests were conducted for rectangular-shaped box wall structures and straight wall structures. The strength and permeability tests at grouted construction joints were conducted to evaluate the structural behavior of repaired construction joints. The present study indicates that the internal grouting method developed in this study enhances greatly the performance of construction joints and may be efficiently used for the leak-tight integrity of construction joints in concrete structures.
현장 모형실험을 통한 벽체구조물의 온도 및 응력발생 특성 분석
오병환 ( Oh Byung-hwan ),최성철 ( Choi Seong-cheol ),박해균 ( Park Hae-kyun ),주태성 ( Joo Tae-sung ) 한국구조물진단유지관리공학회 2002 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.6 No.1
Recently, the underground reinforced concrete(RC) box structures have been increasingly built in Korea. In such structures, the heat of hydration may cause serious crackings in wall member. Thus, the RC box structures needs much attention to control the hydration heat during construction. The purpose of the present study is to analyse temperature and thermal stress of base-restrained wall member which had been made in field. The time-dependent behaviors of early age concrete including temperature and thermal stress are analyzed through experimental results.
오병환 ( Oh Byung-hwan ),김광수 ( Kim Kwang-soo ),김웅재 ( Kim Eung Jae ) 한국구조물진단유지관리공학회 1998 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.2 No.1
콘크리트 구조물의 거동해석과 정밀 안전진단을 위해서는 강도와 다양한 역학적 특성들에 대한 정확한 평가가 필수적이다. 그러나 이에 대한 직접적인 측정과 평가는 현장에서 직접 실시하기에 어려움이 있는 경우가 많으므로 비파괴 검사가 적용되는 경우가 많은데 공명주기 진동수의 측정도 이러한 기법중의 하나이다. 특히 콘크리트의 재료물성이 급격하게 변화하는 초기재령이나 적정한 규격의 시험시편을 제작 할 수 없는 실구조물의 경우 이러한 공명주기 진동수의 측정은 유용하게 적용될 수 있다. 본 연구에서는 보통강도와 고강도 콘크리트에 대하여 고유진동수를 측정하고 이를 이용하여 콘크리트의 동탄성계수를 계산하였다. 또한 이를 이용하여 콘크리트의 역학적 특성을 평가하는 다양한 관계식들에 대한 비교, 분석을 실시하였다.
오병환 ( Oh Byung-hwan ),조인호 ( Cho In-ho ),이영생 ( Lee Young-saeng ),이근희 ( Lee Keun-hee ) 한국구조물진단유지관리공학회 2003 한국구조물진단유지관리공학회 논문집 Vol.7 No.1
Developed is a new environment-friendly concrete-block retaining wall system. The conventional analysis methods are not directly applicable because the proposed concrete-block wall system is made of by interlocking the blocks with shear keys. Therefore, the shear analysis as well as stability analysis have been conducted to secure the safety of block-wall system. Overall slope stability analysis was also performed. An appropriate strengthening method was developed to ensure the safety when the block-wall system is relatively high. The method of analysis for strengthening the concrete-block wall system was also proposed. The proposed environment-friendly concrete block retaining wall system shows reasonable safety and can be a good construction method for retaining walls and river bank walls.
[제4분과/구조거동/재료Ⅱ] 반복하중을 받는 철근콘크리트의 부착슬립 모델
오병환(Oh Byung Hwan),김세훈(Kim Se Hoon),김지상(Kim Ji Sang) 한국구조물진단유지관리학회 2004 한국구조물진단학회 학술발표회논문집 Vol.- No.-
The crack widths of reinforced concrete flexural members are influenced by repetitive fatigue loadings. The bond stress-slip relation is necessary to estimate these crack widths realistically. The purpose of the present study is, therefore, to propose a realistic model for bond stress-slip relation under repeated loading. To this end, several series of tests were conducted to explore the bond-slip behavior under repeated loadings. Three different bond stress levels with various number of load cycles were considered in the tests. The present tests indicate that the bond strength and the slip at peak bond stress are not influenced much by repeated loading if bond failure docs not occur. However, the values of loaded slip and residual slip increase with the increase of load cycles. The bond stress after repeated loading approaches the ultimate bond stress under monotonic loading and the increase of bond stress after repeated loading becomes sharper as the number of repeated loads increases. The bond stress-slip relation after repeated loading was derived as a function of residual slip, bond stress level. and the number of load cycles. The models for slip and residual slip were also derived from the present test data.