KAERI 채널형 전단벽체의 동적해석; 시스템판별, FE 모델향상 및 시간이력 응답

조순호,Cho, Soon-Ho 한국지진공학회 2021 한국지진공학회논문집 Vol.25 No.3

KAERI has planned to carry out a series of dynamic tests using a shaking table and time-history analyses for a channel-type concrete shear wall to investigate its seismic performance because of the recently frequent occurrence of earthquakes in the south-eastern parts of Korea. The overall size of a test specimen is b×l×h =2500 mm×3500 mm×4500 mm, and it consists of three stories having slabs and walls with thicknesses of 140 mm and 150 mm, respectively. The system identification, FE model updating, and time-history analysis results for a test shear wall are presented herein. By applying the advanced system identification, so-called pLSCF, the improved modal parameters are extracted in the lower modes. Using three FE in-house packages, such as FEMtools, Ruaumoko, and VecTor4, the eigenanalyses are made for an initial FE model, resulting in consistency in eigenvalues. However, they exhibit relatively stiffer behavior, as much as 30 to 50% compared with those extracted from the test in the 1st and 2nd modes. The FE model updating is carried out to consider the 6-dofs spring stiffnesses at the wall base as major parameters by adopting a Bayesian type automatic updating algorithm to minimize the residuals in modal parameters. The updating results indicate that the highest sensitivity is apparent in the vertical translational springs at few locations ranging from 300 to 500% in variation. However, their changes seem to have no physical meaning because of the numerical values. Finally, using the updated FE model, the time-history responses are predicted by Ruaumoko at each floor where accelerometers are located. The accelerograms between test and analysis show an acceptable match in terms of maximum and minimum values. However, the magnitudes and patterns of floor response spectra seem somewhat different because of the slightly different input accelerograms and damping ratios involved.

전단보강근이 없는 보의 거동

조순호,Cho, Soon-Ho 한국콘크리트학회 1999 콘크리트학회지 Vol.11 No.1

전단보강근이 없는 보의 거동을 이해하기 위하여 서로 다른 트러스 개념으로부터 출발한 두 종류의 해석방법 및 배경이론[압축응력장(MCFT) 및 균열마찰 (CFTM)이론]을 수단으로 콘크리트 기여강도($V_c$)를 구성하는 i)압축지역의 전단응력, ii)균열면의 마찰작용, iii)주근의 장부작용, iv)아치작용 및 최근에 추가된 v)비균열 부위 잔류 인장강도의 상대적인 중요도를 물리적으로 설명하였다. 또한, 두 해석모델의 평가를 위하여, 최근 국내에서 파괴역학 개념의 크기 효과식 개발에 보다 초점을 맞추어 수행된 일련의 고강도 콘크리트보의 실험결과(20개, $f'_c$=53.7Mpa)를 예측하였다. 예측결과에 의하면, 두 해석모델은 a/d비, 주근량 및 보의 춤이 변화함에 따라 관측된 물리적 현상을 정확하게 포착하고 있었으며, 특히 MCFT로부터 얻어낸 보다 자세한 응력 및 변형도 분포 등에 관한 정보는 일련의 추가적인 설명을 가능하게 하였다. 하지만, 보다 완전한 이론적 배경을 지니고 있는 MCFT는 P4.6 및 D915의 파괴하중을 각각 다소 과소 및 과대 평가하는 경향을 나타내고 있어, 주근량 및 크기효과에 대한 보다 완전한 결론을 유도하기 위해서는 추가적인 실험적 연구가 필요한 것으로 판단되었다. To deepen the understanding of shear behaviour in beams without transverse reinforcement, the relative importance of five contributing factors to concrete shear resistance($v_c$), which are i)flexural compression zone, ii)friction at crack faces, iii)dowel action, iv)arch action and recently identified, v)residual tensile stresses across cracks, was explained physically using two analytical methods based on the truss concept. One is called "Modified Compression Field Theory(MCFT)" considering ii) and v) explicitly, and the other "Crack Friction Truss Model(CFTM)" more dominantly ii) in determining concrete resistance. To verify their effectiveness, the predictions using MCFT and CFTM were also made for twenty KAIST beam tests($f'_c$=53.7Mpa), designated more likely to the development of the size effect law based on the fracture mechanics concept. Experimental findings with varying of a/d, longitudinal reinforcement ratios, and obtained from MCFT enabled additional explanations for some phenomena which were difficult to measure in tests. However, MCFT seemed somewhat conservative for beams with higher longitudinal reinforcement, while somewhat unsafe for beams with larger depths. More tests are necessary leading to firm conclusions in these areas.

자연진동 응답기록에 의한 초고층 건물의 성능치 추출

조순호(Cho Soon-Ho) 대한건축학회 2008 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.28 No.1(구조계)

Dynamic response measurements from natural excitation were carried out for 25- and 42-story buildings to evaluate their inherent properties, such as natural frequencies, mode shapes and damping ratios. Both are reinforced concrete buildings adopting a core wall, or with shear walls as the major lateral force resisting system, but frames are added in the plan or elevation. By using various state-of-the-art system identification methods, the modal parameters are extracted, and the results are then compared. Three frequency- and four time-domain based operational modal identification methods are considered. Overall, all natural frequencies and damping ratios estimated from the different identification methods showed a greater consistency for both buildings, while mode shapes exhibited some degree of discrepancy varying from method to method.

좌굴하중 결정을 위한 비닐하우스 아치구조의 모달실험

조순호(Cho Soon-Ho) 대한건축학회 2009 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.29 No.1(구조계)

To determine the static buckling load for slender arches such as greenhouse structures, a series of modal tests using a fixed hammer and roving sensors was carried out by providing vertical loads in three steps for two arches having different boundary conditions. After preliminary tests, it was found that modal testing for end arches is not reliable because of the interruption of auxiliary horizontal and vertical members attached. Therefore, more attention was given to an internal arch, and modal parameters such as natural frequencies, mode shapes and damping ratios on it were extracted for a total of four loading steps using the comprehensive system identification method. For comparison, several FE analyses were also made, and it is shown that both extracted and FE analysis results are well correlated.

다양한 시스템판별법에 의한 비닐하우스 아치구조의 모달계수 산정

조순호(Cho Soon-Ho) 대한건축학회 2009 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.29 No.1(구조계)

Using vibratory data from experimental modal testing with a fixed hammer and roving sensors for greenhouse arch structures, modal parameters such as natural frequencies, mode shapes and damping ratios are extracted by applying various system identification methods. LSCE and PolyMAX are considered as the experimental modal identification, while FDD and SSI are considered as the operational modal identification. Then their results are compared each other, further to FE analysis results. Their advantages and disadvantages are also discussed.

횡변형률 이력에 근거한 FRP-구속 콘크리트의 해석

조순호(Cho, Soon Ho) 한국콘크리트학회 2008 한국콘크리트학회 학술대회 논문집 Vol.2008 No.11

전단보강근이 없는 보의 거동

조순호(Cho, Soon-Ho) 한국콘크리트학회 1999 콘크리트학회논문집 Vol.11 No.1

NASCOM에 의한 실험결과 예측

조순호(Cho, Soon Ho) 한국콘크리트학회 1996 콘크리트학회논문집 Vol.8 No.3

뉴미디어의 인터렉티브 콘텐츠 사례 연구

조순호 ( Soon Ho Cho ) 커뮤니케이션디자인학회(구 시각디자인학회) 2011 커뮤니케이션 디자인학연구 Vol.36 No.-

인터렉티브 콘텐츠가 선을 보인지도 벌써 10년 이상의 세월이 흘렀다. 우리가 앞으로 만날 미래는 온갖 인터렉티브 콘텐츠가 넘쳐나는 세상으로 방송, 인터넷, 예술, 건축 등 수많은 분야에서 활용되고 경험하게 될 것이다. 본 논문은 이러한 인터렉티브 콘텐츠의 학문적인 해석과 더불어 실무적인 방안을 모색해 보는데 있다. 과거 초고속 네트워크의 보급과 트레픽 등의 문제로 그저 기존보다 앞선 기술로만 해석되던 인터렉티브 콘텐츠가 활성화되고 대중적으로 변화하기 시작한 시점은 불과 몇 년 전이기 때문에 사용되는 각종 용어의 사전적 의미와 실무적 의미가 틀려 표준이라고 부를만한 기존도 없는 상태이다. 그러나 커뮤니케이션 네트워크의 발전과 더불어 그에 따른 디바이스가 속 속 개발되고 있고 사용자의 요구에 부응하는 인터렉티브 콘텐츠가 절실히 요구되는 시대가 되었다. 스마트폰의 등장으로 인해 인터렉티브 콘텐츠의 활용범위는 이제 공공서비스에서 개인화로 넘어가는 시대가 되었고 앞으로 점점 더 그 필요성이 증대될 것이다. 본 논문에서 스마트폰이나 스마트패드 같은 개인정보기기까지는 다루지 못했다. 그 분야만으로도 방대한 연구범위가 이루어질 수 있으므로 별도의 연구가 이루어져야하기 때문이다. 따라서 본 논문은 우리가 쉽게 접할 수 있는 인터넷 기반 멀티미디어 중 인터렉티브 콘텐츠와 그 중 G.U..I를 중점적으로 다루었고 향 후 더욱 더 치열해지고 있는 인터렉티브 미디어 분야의 바람직한 콘텐츠 개발 방향을 모색해 보는데 그 의미를 두고자 한다. It has been 10 years since the interactive contents were introduced for the first time. The future which we will meet from now on will be filled with various interactive contents. In such future, we will be able to utilize and experience such contents in a number of fields including broadcasting media, the Internet, arts and architecture. This study focuses on practical plans as well as academic interpretation of such interactive contents. The interactive contents used to be interpreted just as components of an advanced technology compared to the previous ones regarding the dissemination of a high-speed network and the traffic-related problems in the past. It has been just a few years since such contents were activated and widely used by the public. As a result, the practical meanings of the terms used for such interactive contents are different from those stated in a dictionary. Therefore, there seems to be no standard which can be generally used as a rule. However, together with the development of the communication network, various devices have been continuously developed. As a result, it seems to be necessary to provide users with the interactive contents which could satisfy their demands. With the introduction of smart-phones, the range of utilization for the interactive contents seems to move away from public services to personalized ones. It seems that the necessity for such contents will increase more and more in the future. This study does not handle the contents related to such personal information devices as smart-phones or smart-pads, since it would be impossible to handle such a vast field in this study. It is necessary to carry out a separate study for the field. Therefore, this study focuses on the interactive contents among the Internet-based multimedia which people can get easy access to, especially the part related to G.U.I.. Also, the main purpose of this study is to consider the direction for the development of proper contents in the field of interactive media, which seems to become more competitive in the future.

광고회사의 커뮤니케이션 전략 트렌드 변화에 관한 연구 -제일기획의 CMC 전략을 중심으로-

조순호 ( Soon Ho Cho ) 커뮤니케이션디자인학회 2010 커뮤니케이션 디자인학연구 Vol.33 No.-

요즘 한국 광고업계에 통섭(統攝)의 새바람이 불고 있다. 제일기획을 위시한 한국 메이저 대행사들이 저마다 `통섭`이라는 화두에 관심을 갖기 시작했으며 광고 커뮤니케이션 서비스에 활용하는 방안을 모색하고 있다. 특히 제일기획에서는 2009년 벽두에 `통섭 마케팅 커뮤니케이션(Consilience Marketing Communication)`이라는 새로운 광고 전략을 선포하기에 이르렀고 전사적으로 통섭에 대한 연구 및 적용 방안을 독려하고 있다. 통섭은 시대적 흐름이며 광고업계에서는 필연적으로 받아들여야 하는 새로운 트렌드가 되고 있음이 분명해진 것이다. 통섭이 내포하고 있는 의미와 광고 서비스의 궁극적인 목표가 매우 통(通)한다는 사실, 그리고 기존의 IMC 전략으로는 서비스의 한계에 부딪혔다는 전반적인 인식 때문이다. 이제 통섭의 시대가 도래 했다는 것을 누구도 부인할 수 없는 상황이 되었다. 최근 들어 학계에서부터 활발한 연구 방향이 모색되고 있으며 광고업계뿐만 아니라 일반 기업에서도 이를 수용하고 권장하는 분위기가 무르익고 있다. 본 논문은 이러한 트렌드 변화를 예의 주시할 필요가 있다는 판단 하에 연구 방향을 잡게 되었으며 이 논문을 통해 광고업계의 통섭적 마케팅 방안을 분석해보고 조심스럽게 그 방향성 및 비전에 관해 살펴보고자 한다. Recently, a new wind of Consilience is blowing into the Korean advertising industry. Major advertising agencies, including Cheil Communication, have begun to pay attention to Consilience, and are exploring measures to apply it to the advertising communication services. Specifically, Cheil Communication set a new advertising strategy called `Consilience Marketing Communication` at the beginning of the year and has been encouraging the research and application of consilience at the entire corporate level. Obviously, consilience is the trend of times and has become a new trend to which advertising industry has to conform desperately. That is because the implied meaning of consilience and the ultimate goal of advertising service are in mutually consistent context, and there is a general recognition that the existing IMC strategy has not been effective very much in overcoming the constraints of service. Indisputably, the era of consilience has arrived. Recently, academic circles have been exploring the direction for research vigorously, and ordinary companies, as well as advertising companies, began to accept and recommend consilience. This study sets the direction for research based on the perception that it is necessary to keep a close eye on this shift of trend, and intends to research pertaining to the methods for the consilience service of advertising industry and seek the effective measures carefully.