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Development of Probabilistic - Fuzzy Model for Seisrnic Hazard Analysis
Hong Kappyo 한국전산구조공학회 1991 한국전산구조공학회논문집 Vol.4 No.3
지진예측을 위한 확률론적퍼지모형을 제안하였다. 제안원 모형은 지진발생에 대하여 부작위성 (randomness) 과 퍼 지니스( fuzziness )를 같이 사용하여, 기존의 확률론에 근거한 지진예측방볍을 개선할 수 있도록 하였다. 이 연구의 설과는 (a) 주어진 초과확률에 대한 지반가속도 또는 주어진 지반가속도에 대한 초과확률의 멤벼쉽함수와 (b) 멤써 쉽함수릎 대표할 수 있는 특성값 (characteristic value) 이다. 확률론적퍼지모형을 띠 놔 Utah 주의 Wasatch Front Range 의 자료에 적용하여 서로 다른 연간초파확률, 최대지반가속도에 대하여 지진도른 작성하였다 A probabilistic - Fuzzy model for seismic hazard analysis is developed. The proposed model is able to reproduce both the randorrmess and the imprecision in conjunction with earthquake occurrences. Results 'of this research are (a) membership functions of both peak ground accelerations associated with a given probability of exceedance and probabilities of exceedance associated with a given 야ak ground acceleration, and (b) characteristic values of membership functions at each location of interest. The proposed probabilistic - fuzzy model for assessment of seismic hazard is successfully ap plied to the Wasatch Front Range in Utah in order to obtain the seismic maps for different annual probabilities of exceedance, different peak groud accelerations, and different time periods.
율동하중을 받는 구조물의 동하중계수에 관한 실험적 연구
홍갑표(Hong Kappyo),윤광섭(Yoon Kwang Sup) 대한건축학회 2003 大韓建築學會論文集 : 構造系 Vol.19 No.6
The modern structures are being built using high-strength and light-weight construction materials, resulting in decreased structural mass and damping properties. Rhythmic activities such as jumping, dancing and clapping during lively concerts can produce excessive vibration of structures. Generally the design process of rhythmic activities follows NBC or AISC, but each standards have some restrictions. Dynamic load factors for jumping were not suited in case that many participants stand densely and dynamic load factors for lively concerts were not sufficient on current tendency. Therefore, the tests were made to use force platform to consider the change of dynamic load factor according to the number of participants and the density of participant. The dynamic loads were measured directly from the dynamic force transducer and dynamic load factors were analyzed by Fast Fourier Transform. The tests were made 474 times and used the regression analysis. As a result, the dynamic load factor reduction formula was leaded according to the sort of rhythmic activities and the density of participants.
메탈터치 이음부의 틈의 크기에 따른 응력전달 거동에 대한 연구
홍갑표,김석구,Hong, Kappyo,Kim, Seok Koo 한국강구조학회 2004 韓國鋼構造學會 論文集 Vol.16 No.5
건물이 고층화되어 가면서 철골구조 사용이 빈번해지고 있으며 철골구조물의 큰 축력을 받는 기둥에 있어서 이음부 설계가 중요한 문제가 되고 있다. 한편, 미국 AISC 기준에서는 기둥이음에서 지압내력으로 모든 압축축력을 전달할 수도 있으나, 우리나라 기준에서는 소요압축축력의 1/4만을 접촉면에 의해 직접전달 시킬 수 있다고 제한함에 따라 메탈터치를 활용한 기둥이음에 대한 새로운 방법의 개발이 제한되고 있는 실정이다. 따라서 본 논문에서는 기존 볼트, 용접 체결된 실험체에 이음부 틈의 크기를 매개변수로 하는 실험체의 응력전달체계를 규명하고, 메탈터치 정도에 따른 철골기둥 이음부의 압축축력전달 메카니즘을 검증한다. 또한 해석과 실험을 통하여 틈의 크기에 따른 거동 양상을 파악하여 메탈터치에 의한 이음부에서의 응력전달체계에 대한 확인과 이론적 기초를 제시하고자 한다. As buildings become more high-rise and lightweight in recent years, steel has been utilized more frequently. Based on the American AISC standard, all axial loads could be carried through a bearing load in a column splice, but according to Korean codes, the bearing load has constrained the stress that could be carried by only 25% of all axial loads. Thus, new column splice methods that use metal touch have been examined. In this study, the stress path mechanism, as an intermediation parameter in the gap's magnitude, must be determined. Similarly, the behavioral aspect of the metal touch connection must be sought after comparing and analyzing the results of the test.
강선과 강재판을 이용하는 구조물 횡변위 제어법의 효과에 관한 연구
이민석 ( Lee Minseok ),홍갑표 ( Hong Kappyo ) 한국구조물진단유지관리공학회 2010 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.14 No.1
This paper introduces a tendon method of structure using cable tensile forces and steel plate increased the strength and stiffness of the tendon structure. For knowing the control effectiveness this paper performed structural analysis according to different stiffness of the steel plate and different tension of cable, and consequently the tendon method using the cable and steel plate can effectively control lateral drift. So based on analyzed results the suggested tendon method is good for repair and reinforcement work of the existing structures or new construction without gaining the weight of the structure.
Fire Resistance of the Korean Asymmetric Slim Floor Beam Depending on Load Ratio
Park, Sooyoung,Kim, Hyungjun,Kim, Heungyoul,Hong, Kappyo Architectural Institute of Japan 2011 JOURNAL OF ASIAN ARCHITECTURE AND BUILDING ENGINEE Vol.10 No.2
<P>In Korea recently, interest is increasing in slim floor systems that have superior structural performance and fire resistance. This paper contains the results of tests to confirm the fire resistance behavior of the composite asymmetric slim floor beam. The fire resistance behavior was analyzed using the finite element program ANSYS and the finite element models were validated against the test results. The validated thermal and structural models were used to predict the fire resistance of the Korean asymmetric floor beam and the average temperature of the steel bottom flange depending on load ratio changes. As a result, the 346ASB and the 350ASB were found to have 60 minutes of fire resistance when their load ratios were under 0.47 and 0.48 respectively without additional fire protection. Also, the authors have set the average temperature of the bottom flange, which has a direct impact on the ASB system, as a limiting temperature that enables gauging of its fire resistance as a table according to the load ratio, and presented the limiting temperature as a regression equation according to the fire resistance time.</P>
분절형 PC공법을 적용한 미진동 시설 대경간 바닥구조시스템의 동특성에 관한 실험적 연구
김시준(Kim Si-Jun),홍갑표(Hong Kappyo) 대한건축학회 2011 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.31 No.2(구조계)
This study has been begun to find solutions of design with long span in the micro vibration facility using a PC system with a span over 17m. Previous studies suggested segmented PC beam system for the long span floor and structural performance of PC beam-column joint. The purpose of this study was to analyze dynamic characteristics of long-span floor system applying segmented PC method. For this study, 1/2 scale mock-up was made using similitude law and experimental mode analysis were conducted.
Drift design model for high-rise buildings based on resizing algorithm with a weight control factor
Seo, Ji Hyun,Song, Weon-Keun,Kwon, Yun Han,Hong, Kappyo,Park, Hyo Seon John Wiley Sons, Ltd. 2008 The structural design of tall and special building Vol.17 No.3
<P>It is well known that the weight of the structural system for a high-rise building to resist lateral loads increases in nonlinear fashion with increase in building height and slenderness ratio. For a given building height or slenderness ratio, the weight of the structural system for a high-rise building subjected to lateral loads depends on the degree of stiffness of the building structure. Therefore, at the final stage of the structural design process, it has been a challenge to structural engineers to improve the efficiency of a structural system by either minimizing the weight of a structure for a given limit on lateral displacement or maximizing the degree of stiffness for a given weight of a structure. In this paper, a resizing design method that can minimize the magnitudes of lateral displacement and inter-story drift of a high-rise building with respect to structural weights is presented. Based on the proposed design method, the relation between the structural weight and the magnitude of lateral displacement is investigated using two examples, including a 60-story high-rise building. Copyright © 2007 John Wiley & Sons, Ltd.</P>