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홍건호 ( Hong Geon-ho ),백종삼 ( Baek Jong-sam ),박홍근 ( Park Hong-gun ) 한국구조물진단유지관리공학회 2009 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.13 No.2
Recently, the interest of precast concrete has increased in the construction sites. Prior to the use of precast concrete evaluation of structural performance is required. Hollow-core slab on the lateral loads should be the diaphragm action sufficient. The purpose of this study is to evaluate the in of plane shear resistance performance between hollow-core slab. To achieve this objective, according to the thickness of the topping concrete in of plane shear resistance performance of hollow-core slab was analyzed through experiments.
강섬유보강 콘크리트를 사용한 무배근 연속슬래브의 구조성능
홍건호(Hong, Geon-Ho) 대한건축학회 2015 大韓建築學會論文集 : 構造系 Vol.31 No.8
Slab is one of the most important members in the building structures because it covers the largest area of the building. But, amount of reinforcement in this member is relatively small because of its small supporting loads. And large exposed area in slab can induce the cracks. To improve this characteristics, the new slab system consist of structural deck-plate and fiber reinforced concrete was suggested for improving construction ability and reduction of construction period. Basic concept of this slab system is that structural deck-plate can replace the tensile reinforcing bars and concrete form, and fiber reinforced concrete can replace the temperature reinforcement. But, previous study was limited because it tested only simply supported slab specimens. This study tested various continuous slab specimens to find the applicability of the suggested new slab system without any additional reinforcement. Design concept is that structural design of slab is assumed as simply support slab, but it should keep the negative moment cracks under allowable crack width in service load conditions. Four continuous slab specimens in total were tested for analyzing the flexural strength, stiffness, deflection, crack development and failure pattern. Test results indicated that suggested new slab system appeared to be better flexural capacity and stiffness than normal reinforced concrete slab with negative moment reinforcement. And it can control the cracks under the allowable crack width upto the service and factored loads.
고인장 강섬유보강콘크리트의 재료실험을 통한 역학적 특성 분석
홍건호(Geon-Ho Hong),길근영(Geun-Young Gil) 호서대학교 공업기술연구소 2022 공업기술연구 논문집 Vol.41 No.1
프리캐스트 콘크리트 슬래브의 토핑콘크리트를 강섬유보강콘크리트로 대체하여 토핑부에 배근하는 철근을 대체하기 위한 연구이며, 강섬유보강콘크리트의 강섬유 최적 배합비를 검토하고자 하였다. 이를 위해 압축강도, 휨강도, 및 건조수축 균열의 특성 등에 대한 재료실험을 수행하였으며 변수는 강섬유의 형상, 혼입률, 인장강도 및 콘크리트의 압축강도이다. 강섬유의 형상은 후크형, 중앙부가 직선 및 굴곡진 특징을 웨이브형 2가지 타입으로 형상은 총 3가지로 진행하였다. 재료실험 결과 혼입률 40kg/m3, 중앙부가 굴곡이 있는 웨이브형의 강섬유의 성능이 가장 우수한 결과가 나왔다. This study was intended to replace the reinforcement distributed to the topping by replacing the topping concrete of the precast concrete slab with steel fiber reinforced concrete, and to review the optimal mixing ratio of steel fiber reinforced concrete. To this end, material experiments were conducted on compressive strength, flexural strength, and characteristics of dry shrinkage cracks, and the variables are the shape, contetnts, tensile strength of steel fiber and compressive strength of concrete. The shape of the steel fiber was hook-shaped, and the center part was straight and curved, and there were two wave-shaped shapes, and a total of three shapes were used. As a result of the material experiment, the performance of the wave-type steel fiber with a mixing ratio of 40kg/m3 and a curved center was the best.
Hollow core 슬래브의 중량충격음 성능에 대한 연구
홍건호(Hong Geon-Ho),박홍근(Park Hong-Gun),황재승(Hwang Jae-Seung) 대한건축학회 2008 대한건축학회논문집 Vol.24 No.6
The purpose of this study was to investigate the performance of heavy-weight floor impact noise of hollow core slabs compared to the normal solid concrete slabs. Total 7 specimens sized 3m×4.2m were tested. And computational sound power analysis was performed to verify the test results. Main variables were the kinds of structural slab, thickness of hollow core, and the existence of finishing and noise insulators. Dynamic analyses were performed to analyze the natural frequency and period, mode shapes, frequency domain and sound power of the two-way and one-way slabs. Following to the test results, it was found that the heavy-weight floor impact sound pressure level was decreased considerably when hollow core slab was used. Floor impact sound pressure level was decreased up to 4~5㏈, but the effects of slab thickness and the existence of noise insulators were insignificant. Computational analysis results revealed this effect was mainly caused by the difference of the structural slab system. Hollow core slab is used the one-way slab system, and this structural slab system affects the dynamic properties of the slab.
홍건호(Hong, Geon-Ho) 대한건축학회 2017 大韓建築學會論文集 : 構造系 Vol.33 No.2
In recent years, many countries are continuing to construct the super tall buildings despite of the global economic crisis. In case of super tall buildings, increase in the load of vertical members increases the important issues. Many researchers conducted the research on the high strength concrete filled steel tube to resolve these problems. The purpose of this study is to investigate the ultimate axial load capacity on the high strength CFT to evaluate the suitability of design code and enlarge the limit of material"s strength based on the test results of various variables. The main variables were concrete compressive strength(30∼100 MPa) and yield strength of steel(235∼723 MPa) on the short and long CFT columns. Total 14 CFT short and long column specimens were tested under the axial compression. Test results were analyzed in the viewpoint of axial load capacity, load-shortening relationship, and failure aspect. KBC 2016 code was used to evaluate the test results. The results of this study were as follows; KBC 2016 code can safely predict the load capacity of the CFT regardless of the section type of the element or the strength of steel. But in the case of using the high strength concrete, it has appeared to be less safe in accordance with the confinement effects. On the other hand, safety ratio of the high strength steel is higher than that of normal strength steel because of reflecting the effect of slenderness ratio.