재료특성의 변동을 고려한 고층건축구조물의 확률론적 시공단계해석

강경수,구민선,유은종,Kang, Kyung-Soo,Gu, Min-Sun,Yu, Eun-Jong 대한건축학회 2011 대한건축학회논문집 Vol.27 No.11

A probabilistic construction stage analysis using the SSM(Step-by-Step Method) and the Monte Carlo Simulation was performed to address the effects of uncertainty of the material properties for the construction stage analysis. Because of the common influencing factors in the material models for the creep and shrinkage, it is reasonable to assume that the creep and shrinkage behavior of concrete are correlated by some degree rather than completely independent. Thus, in this study, multiple sets of analyses by changing the correlation coefficients between the creep and shrinkage coefficients from 0 to 0.6 with an increment of 0.2 were performed, and the displacement estimates were compared. A two-bay plane frame structure was used for the example structure. Analysis results showed that the variance of total displacement also increases as the correlation between the creep and shrinkage was increased.

독립성분분석(ICA)법을 이용한 병진-비틀림 연계된 구조물의 모드분리 및 응답기반 시스템식별

강경수,김홍진,황재승,Kang, Kyung-Soo,Kim, Hong-Jin,Hwang, Jae-Seung 대한건축학회 2012 대한건축학회논문집 Vol.28 No.2

The response of a lateral-torsionally coupled structure subject to dynamic wind loads can include the response for the along wind direction as well as that of the across and torsional directions. This study aims to propose a procedure to separate the modal responses from the lateral-torsionally coupled structural responses by using the independent component analysis(ICA) method and to effectively estimate the dynamic properties from the separated modal responses. The wind loads for the dynamic analysis of structure are generated from Karman wind speed spectrum for the along wind direction and an empirical overturning moment spectrum for the across wind direction. The kurtosis is introduced as the performance index for the mode separation by ICA. For the verification of the proposed method, a numerical simulation is performed. In the simulation, it is found that the lateral-torsionally coupled modal response can be separated precisely by ICA technique and very closely located modes can be also separated. From the numerical results, it is also shown that the modal properties such as natural frequencies and damping ratios are estimated effectively using the Hilbert transform and curve fitting, respectively. The results in this study show that the proposed method can be very usefully applied to the output-only system identification.

건전지와 Super Capacitor를 이용한 소형 및 대형 자동차용 초소형 저가형 Jump Starter 회로

강경수(Kyung-soo Kang),오승재(Seong-jae Oh),노정욱(Chung-Wook Roh) 전력전자학회 2018 전력전자학술대회 논문집 Vol.2018 No.7

고효율 Induction Heating 인버터를 위한 공진점 추적제어 기법

강경수(Kyung-Soo Kang),김상언(Sang-Eon Kim),노정욱(Chung-Wook Roh) 전력전자학회 2014 전력전자학술대회 논문집 Vol.2014 No.7

지반특성에 따른 동조질량감쇠기의 지진응답특성 및 최적설계변수

강경수(Kang, Kyung-Soo) 한국산학기술학회 2011 한국산학기술학회논문지 Vol.12 No.11

기존 동조질량감쇠기의 최적설계변수에 관한 연구는 풍하중과 같은 조화하중을 받는 구조물을 대상으로 연 구가 수행되었다. 본 연구에서는 수치해석을 통하여 지진하중이 작용하는 건축물에 설치되는 동조질량감쇠기의 최적 감쇠비와 동조진동수비를 구하였다. 지반특성을 단단한 지반, 연약지반, 단층 근처 지반으로 분류하고, 이들 지반특성 을 고려한 수치해석을 통해 구한 동조질량감쇠기의 설계변수를 기존 연구 결과와 비교하였다. 수치해석결과 본 연구 로부터 구해진 동조질량감쇠기의 설계변수값을 적용한 경우 지진하중에 의한 응답제어에 기존 연구를 통해 얻어진 변수값을 적용한 경우에 비해 더 나은 제어효과를 얻을 수 있음을 알 수 있었다. Most previous studies for finding optimal design parameters of a tuned mass damper(TMD) have been focused on the harmonic excited single-degree-of freedom system. In this study, optimal values of damping ratio and tuning frequency ratio of a TMD applied to control a seismically excited structure are investigated through numerical analyses. Considering that the structural responses due to earthquake loads are strongly dependent on the soil condition, the site effects on the optimal parameters of the TMD are studied and compared to those presented by previous studies. Numerical analyses results indicate that better control performance can be obtained by using the parameters proposed by this study in the seismic application of the TMD.

지붕하중 증가에 따른 공장건물 안정성확보를 위한 지붕외장재의 구조성능정보의 필요성

강경수(Kyung-Soo Kang) 한국산학기술학회 2017 한국산학기술학회논문지 Vol.18 No.11

구조해석기법의 발전과 경제성을 중시하는 현실에 의해 건축물 주골조의 모멘트 강도비(Mu/ΦMn)는 점차 증가하고 있다. 따라서 본 연구에서는 지붕재로 샌드위치패널을 사용하는 건축물의 안전성검토를 위하여, 지붕하중의 증가에 따른 구조해석을 실시하여 주구조부재의 Mu/My와 Mu/Mp의 변화를 검토하였다. 해석모델은 PEB구조 건물과 일반 H형강구조 건물을 대상으로 지붕하중을 증가시켜 구조해석을 실시하였다. 해석결과 해석모델의 지붕 설계하중의 약11% 증가할 경우, 주구조부재의 Mu/My가 1을 초과하였고, 약 36% 증가할 경우 작용모멘트가 소성모멘트보다 커져 부재의 파괴가 예상되었다. 중도리간격에 따른 지붕외장재가 지지할 수 있는 최대하중, KS기준에서 제시한 최대하중, 외장재생산업체의 시험값으로 산정한 최대하중을 비교하였다. 3가지 방법으로 구한 패널이 지지할 수 있는 최대하중값은 주구조부재의 파괴가 예측되는 하중보다 큰 값을 나타내었다. 따라서 예상치 못한 지붕하중 증가로 인해 외장재의 파괴이전에 주구조부재의 파괴로 인한 구조물 전체 붕괴가 발생할 수 있으므로 안전성 확보를 위해서는 지붕외장재의 구조성능에 대한 정확한 정보의 필요성과 외장재 역시 구조설계대상임을 알 수 있었다. The strength ratio of the main structures of buildingsisgradually increasing, due to the advances made in analysis and cost saving techniques. In this study, to examine the stability of industry buildings using sandwich panels as roof assemblies, we examine the changes in the moment strength ratio of the main structures caused by increasing the roof load. This study adopts the PEB structure and three H-steel structure as the structural analysis models. In the case where the additional load exceeds about 11% of the roof design load, the strength ratio exceeds 1 for the main structure. In the case wherethe additional load exceeds about 36%(of the roof design load), the working moment exceeds the plastic moments, which leads to major damage to the structure. This study compares 1) the maximum load according to the purlin spaces, 2) the maximum load by KS, and 3) the maximum load calculated from thetest results of the manufacturer.The maximum bearing load of the panelsdetermined by all three methods exceeds the structure failure threshold load of the main structure. This study provides evidence that an unexpected increase in the roof load might cause the whole structure to collapse, due to the failure of the main structural members, before the failure of the roof assemblies. Therefore, information on the structural performance of the sandwich panels is required for the structural design, and the sandwich panels should be considered to be an integral part of the overall structural design.

마찰감쇠기-가새 시스템의 확률분포 기반 등가선형화에 관한 실험적 연구

강경수(Kang, Kyung-Soo),박지훈(Park, Ji-Hun) 한국소음진동공학회 2006 한국소음진동공학회 논문집 Vol.16 No.4

A new equivalent linearization technique is proposed for a friction damper-brace system (FDBS) idealized as a elastoplastic system. The equivalent linearization technique utilizes secant stiffness and dissipated energy defined by the probability distribution of the extremal displacement of the FDBS. In addition, a conversion scheme is proposed so that an equivalent linear system is designed first and converted to the FDBS. For comparative study, an existing model update technique based on system identification is modified in a form appropriate to update single element. For the purpose of verification, shaking table tests of a small scale three-story shear building model, in which a rotational FDBS is installed, are conducted and equivalent linear systems are obtained using the proposed technique and the model update technique. Complex eigenvalue analysis is conducted for those equivalent linear systems, and the natural frequencies and modal damping ratios are compared with those obtained from system identification. Additionally, RMS and peak responses obtained from time history analysis of the equivalent linear systems are compared with measured ones.

Plasma Burner 구동을 위한 무손실 단일 스위치 인버터

강경수(Kyung-Soo Kang),김상연(Sang-Yeon Kim),김세민(Se-Min Kim),이정준(Jeong-sun Lee),노정욱(Chung-Wook Roh) 전력전자학회 2015 전력전자학술대회 논문집 Vol.2015 No.07

재료특성의 변동을 고려한 고층건축구조물의 확률론적 시공단계해석

강경수(Kang, Kyung-Soo),구민선(Gu, Min-Sun),유은종(Yu, Eun-Jong) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.11

A probabilistic construction stage analysis using the SSM(Step-by-Step Method) and the Monte Carlo Simulation was performed to address the effects of uncertainty of the material properties for the construction stage analysis. Because of the common influencing factors in the material models for the creep and shrinkage, it is reasonable to assume that the creep and shrinkage behavior of concrete are correlated by some degree rather than completely independent. Thus, in this study, multiple sets of analyses by changing the correlation coefficients between the creep and shrinkage coefficients from 0 to 0.6 with an increment of 0.2 were performed, and the displacement estimates were compared. A two-bay plane frame structure was used for the example structure. Analysis results showed that the variance of total displacement also increases as the correlation between the creep and shrinkage was increased.

독립성분분석(ICA)법을 이용한 병진-비틀림 연계된 구조물의 모드분리 및 응답기반 시스템식별

강경수(Kang Kyung-Soo),김홍진(Kim Hong-Jin),황재승(Hwang Jae-Seung) 대한건축학회 2012 大韓建築學會論文集 : 構造系 Vol.28 No.2

The response of a lateral-torsionally coupled structure subject to dynamic wind loads can include the response for the along wind direction as well as that of the across and torsional directions. This study aims to propose a procedure to separate the modal responses from the lateral-torsionally coupled structural responses by using the independent component analysis(ICA) method and to effectively estimate the dynamic properties from the separated modal responses. The wind loads for the dynamic analysis of structure are generated from Karman wind speed spectrum for the along wind direction and an empirical overturning moment spectrum for the across wind direction. The kurtosis is introduced as the performance index for the mode separation by ICA. For the verification of the proposed method, a numerical simulation is performed. In the simulation, it is found that the lateral-torsionally coupled modal response can be separated precisely by ICA technique and very closely located modes can be also separated. From the numerical results, it is also shown that the modal properties such as natural frequencies and damping ratios are estimated effectively using the Hilbert transform and curve fitting, respectively. The results in this study show that the proposed method can be very usefully applied to the output-only system identification.