강골조 구조물의 보강을 위한 FRP 패널의 수치해석

권민호,김진섭,임정희 한국복합신소재구조학회 2017 복합신소재구조학회 학술발표회 Vol.2017 No.04

Numerical behavior of FRP(Fiber Reinforced Polymer) panel in steel frame structure was evaluated through the finite element analysis in this study. In order to numerical analysis, a experimental test results was used to develop a three dimensional finite element model of steel frame specimen. Numerical results of the steel frame specimen was well predicted the experimental behavior of steel frame specimen. Based on the developed three dimensional finite element model of steel frame specimen, the behavior of FRP panel in the steel frame specimen was evaluated. From the numerical analysis results, strength of the steel frame specimen with FRP panel was governed by FRP panel. Also, diagonal compression behavior governed the FRP panel in the steel frame specimen in the numerical analysis results.

비부착 철근 여부에 따른 RC 보-기둥 접합부의 성능평가

권민호,정우영,정재훈 한국구조물진단유지관리공학회 2011 한국구조물진단유지관리공학회 논문집 Vol.15 No.6

우리나라는 삼면이 바다로 이루어져 있으며 많은 철근콘크리트 구조물이 위치해 있다. 만약 철근콘크리트 구조물이 염해의 노출이 장기화 된다면 철근의 부식으로 인하여 철근-콘크리트 부착성능이 감소될 뿐만 아니라, RC 구조물의 성능저하가 우려되고 있다. 따라서 본 연구에서는 부착성능이 상실된 RC 보-기둥 접합부에 대한 기초자료를 확보하기 위해 연구를 수행하였다. 철근-콘크리트 부착이 상실된 보-기둥 접합부를 제작하여 부착 및 비부착 특성 여부에 따라 반복 횡하중 실험 및 해석적 연구를 수행하여 접합부의 성능을 평가 및 고찰하였다. Many reinforced concrete structures have been constructed at the offshore in Korea and those are exposed in environments for long period. Due to that, the reinforcement of the structure faces possibility of corrosion by the salt damage. Such corrosions are effects on the bond performance between concrete and reinforcing bar as well as the performance of the structure. In this study, the performance of RC structure has been investigated when the reinforcing bars are totally bonded and unbonded in the structure. Through the experimental tests and finite element analyses of beam-column joint with bond and unbonded reinforcing bar, the energy dissipation capacity, strength, and crack distribution are compared and discussed.

단일 경계조건을 갖는 단면에 대한 비틀림 상수계산

권민호,김진섭,서현수,임정희 한국복합신소재구조학회 2017 복합신소재구조학회 학술발표회 Vol.2017 No.04

Torsional constants of both rectangular cross section and circular cross section are induced by exact solution, and was easy to calculate since of simple shape. However, it is very difficult to calculate the torsional constant of both an arbitrary cross-section and a composite cross-section. In this study, a finite element formulation was proposed as a method to calculate the torsional constant of both an arbitrary cross-section and a composite cross-section. From the numerical study, numerical results was compared with exact solution.

용접접합된 강골조 접합부의 수치해석모델 개발

권민호,서현수,임정희,김진섭 한국복합신소재구조학회 2016 복합신소재구조학회논문집 Vol.7 No.4

Abstract: In this study, finite element analysis modeling is proposed to evaluate middle- and low-rise steel-frame buildings constructed in South Korea. Two steel-frame joint specimens with welding joint parts were constructed and evaluated. Two types of displacement load, monotonic and cyclic, were used to evaluate the steel-frame joint specimens. According to the experimental results, the maximum moment of the cyclic test results was 80% smaller than that of the monotonic test results. Local buckling was observed in the compression area of the H-beam flange. A finite element analysis model based on the experimental results was proposed to analyze the steel-frame joint specimens. The numerical results predicted the experimental behavior of the steel-frame joint specimens well. Therefore, it is possible to use the proposed finite element analysis model to evaluate middle- and low-rise steel-frame buildings constructed in South Korea.

Numerical Study of RC Beam-Column Joints Using a 4-Node Lattice Element Analysis Method

권민호,정영석,김진섭 대한토목학회 2021 KSCE Journal of Civil Engineering Vol.25 No.3

In this study, a 4-node lattice element was formulated based on the general lattice model. The experimental program was conducted to verify the 4-node lattice element analysis. In the experimental program, four kinds of RC beam-column specimens were constructed. Anchorage shapes of beam and bonding interfaces between the reinforcement and concrete in the beam part were used as parameters of the specimen. The material properties of unbonded reinforcement used in the 4-node lattice element analysis were derived from nonlinear fiber-section analysis. The load-displacement hysteresis behavior of the 4-node lattice element analysis results are compared with that of the experimental study. The improved lattice analysis method could be used to predict the hysteresis behavior quicker and more simply. It should now be possible not only to use the prediction of the unbonded reinforcement behavior more accurately, but also to apply nonlinear dynamic analysis to general reinforced concrete structures.

개미 군락 최적화 기법을 통한 고강도 경량 골재 콘크리트의 인장연화곡선 도출

권민호,서현수,임정희,김진섭 한국복합신소재구조학회 2016 복합신소재구조학회논문집 Vol.7 No.3

In korea, only small amount of nonstructural lightweight concrete is being used through indirect effects such as heat insulation property and soundproofing rather than structural elements due to lack of structural lightweight aggregates and lack of understanding about lightweight concrete development, etc. That`s why structural lightweight concrete to reduce weight has not been put to practical use. This study is a part of high strength lightweight aggregate concrete researches using lightweight aggregates and the purpose of this study is to find out the basic physical characteristics and tension cracking fracture characteristics of lightweight concrete. Crack Mouth Opening Displacement is measured through 3 point flexure experiment about notch beam. Load-CMOD characteristics are examined through rules of countries, characteristics of lightweight concrete and tension cracking fracture experiments. The degree of tensile characteristic alteration according to size changes of specimen and the characteristics about crack surface are analyzed. The changes of softening curve are analyzed and fracture energy is drawn through inverse analysis by the obtained Load-CMOD curve. To decide fracture energy and analysis parametric, inverse analysis is conducted and Ant Colony Method is conducted for optimization and then a way to find out optimal parameterization fracture energy is suggested.

Thin Layer Graphene Functionalized Poly(Sodium 4-styrene sulfonate) Using Thiol-Ene Click Reaction with Graphene Oxide Wet Cake

권민호,이태헌,한종훈,백현종 한국고분자학회 2017 한국고분자학회 학술대회 연구논문 초록집 Vol.42 No.1

건설산업 내외 복합재 적용을 위한 기술동향 분석

권민호 한국복합신소재구조학회 2020 복합신소재구조학회 학술발표회 Vol.2020 No.07

Seismic performance of RC-column wrapped with Velcro

권민호,서현수,김진섭 국제구조공학회 2016 Structural Engineering and Mechanics, An Int'l Jou Vol.58 No.2

A seismic strengthening method using Velcro is proposed to improve the seismic performance of columns in RC frame structures. The proposed method was evaluated experimentally using three fabricated RC specimens. Velcro was wrapped around the columns of the RC-frame specimen to prevent concrete spall falling. The reinforcing performance of the Velcro was determined from comparison of results on seismic performance (i.e., strength, displacement, failure mode, displacement ductility capacity and amount of dissipated energy). As the displacement of the reinforced specimens was increased, the amount of dissipated energy increased drastically, and the displacement-ductility-capacity of the reinforced specimens also increased. The final failure mode of RC frame structure was changed. As a result, it was concluded that the proposed seismic strengthening method using Velcro could be used to increase the displacement ductility of RC columns, and could be used to change the final failure mode of RC-frame structures.

CMIP5 기후모델에서 나타나는 열대저기압 생성빈도의 연진동과 경년변동성: 잠재생성지수의 이용

권민호 한국지구과학회 2012 韓國地球科學會誌 Vol.33 No.7

The potential for tropical cyclogenesis in a given oceanic and atmospheric environments can be represented by genesis potential index (GPI). Using the 18 Coupled Model Inter Comparison Project phase 5 (CMIP5) models, the annual cycle of GPI and interannual variability of GPI are analyzed in this study. In comparison, the annual cycle of GPI calculated from reanalysis data is revisited. In particular, GPI differences between CMIP5 models and reanalysis data are compared, and the possible reasons for the GPI differences are discussed. ENSO (El Nino and Southern Oscillation) has a tropical phenomenon, which affects tropical cyclone genesis and its passages. Some dynamical interpretations of tropical cyclogenesis are suggested by using the fact that GPI is a function of four large-scale parameters. The GPI anomalies in El Nino or La Nina years are discussed and the most contributable factors are identified in this study. In addition, possible dynamics of tropical cyclogenesis in the Northern Hemisphere Pacific region are discussed using the large-scale factors. 대기 및 해양의 대규모 환경에서 열대저기압 발생의 잠재적 빈도는 잠재생성지수(GPI; Genesis Potential Index)를 이용하여 예측할 수 있다. 본 연구에서는 18개의 CMIP5 기후모델을 이용하여 GPI의 연진동 및 경년변동성이 분석되었다. 비교를 위하여 재분석자료로부터 계산된 GPI의 연진동이 재조명되었다. 특히 CMIP5 기후모델과 재분석자료에 의한 GPI가 비교되었고, 그 차이에 대한 가능한 해석이 논의되었다. ENSO (El Nino and Southern Oscillation)는 열대 저기압 발생 및 경로에 영향을 주는 열대 기후현상이다. 잠재생성지수가 네 개의 대규모 매개변수의 함수임을 이용함으로써 열대저기압발생에 대한 역학적 해석이 제시되었다. 본 연구에서는 엘니뇨 혹은 라니냐 해에 GPI 편차를 논의하였고, 그 편차에 가장 영향을 많이 주는 인자를 찾았다. 또한 여러 대규모 인자를 활용하여 북태평양지역 열대저기압 발생에 대하여 가능한 기작을 논의하였다.