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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.
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.
시설경비 고객접점서비스가 재구매 의도, 고객만족, 고객신뢰, 브랜드이미지에 미치는 영향에 관한 연구 : 경비원 연령의 조절효과 검증
강경수(Kang, Kyung-Soo),정주섭(Jung, Ju-Ho) 한국경호경비학회 2021 시큐리티연구 Vol.- No.66
시설경비에서 경비원은 고객과의 접점에서 다양한 역할을 수행하며, 핵심적인 서비스를 제공한다. 특히 시설경비 서비스의 특성상 고객접점에서 제공하는 서비스품질은 고객이 경비회사를 평가하는 중요 요소이기 때문에 경비회사의 지속가능을 위해서 매우 중요하다. 이에 고객접점서비스가 재구매 의도 및 고객만족, 고객신뢰, 브랜드이미지에 미치는 영향에 대해 알아봄으로써 시설경비 서비스품질을 개선하고, 고객의 재구매 향상방안을 제시하고자 한다. 전국 시설경비서비스 이용고객을 대상으로 설문조사를 실시하였고, 802부를 분석에 이용하였으며 그 결과는 다음과 같다. 첫째, 고객접점서비스의 하위 구성요소인 서비스 수행능력, 서비스 효과, 서비스 신뢰, 서비스 열정, 서비스 혁신 행동은 고객만족, 고객신뢰, 브랜드이미지, 재구매 의도에 유의미한 영향을 주었다. 둘째, 경비원 연령은 이들 관계에서 조절효과를 가지는 것을 확인하였다. 연구의 결과를 통해 시설경비업체는 경비서비스를 이용하는 고객의 요구를 잘 파악하여야 하고, 이에 대응하는 맞춤형 서비스를 제공할 필요가 있음을 알 수 있다. 특히 고객접점에서 제공되는 서비스를 세분화하여 재구매 의도, 고객만족, 고객신뢰, 브랜드이미지에 미치는 영향을 상세히 확인함으로써 구체적으로 강화해야 하는 요인들을 도출하였다. 또한, 경비원 연령이 미치는 조절효과를 검증하여 시설경비가 지속가능을 위해 앞으로 나아가야 할 방향을 제안하였다. Security guards play various roles in service encounters for customers to provide core services in facility security. In particular, due to facility security services nature, service encounters quality is essential for security companies sustainability. Therefore, the authors intend to improve facility security quality in service encounters and suggest ways to improve customer repurchase, customer satisfaction, customer trust, and brand image. This study conducted a survey to check research hypotheses. 802 samples were used for analysis, and the results are as follows. First, service performance ability, service effect, service trust, service enthusiasm, and service innovation behavior, which are sub-components of service encounters, significantly influenced customer satisfaction, customer trust, brand image, and repurchase intention. Second, the result shows that the security guard s age moderates relationships between the independent variable (service encounter qualities) and dependent variables(customer satisfaction, customer trust, brand image, and repurchase intention). This study shows that facility security companies need to understand the needs of customers who use security services and provide customized services corresponding to them. In particular, this study identifies that service encounter qualities enhance repurchase intention, customer satisfaction, customer trust, and brand image. In addition, the authors propose the direction for the sustainability of security companies by verifying the moderating effect of the security guard s age.
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.
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.