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박준용,이우현,남창우 한국계량경제학회 2003 계량경제학보 Vol.14 No.1
본고는 부동산요인(공급: 건축허가면적, 수요: 25-29세 인구비율), Fama and French(1992, 1993)가 제시한 주식요인(시장요인, SMB(규모요인), HML(가치요인)), 채권요인, 박준용·이우현·남창우(2001)의 방법에 따른 거시요인 중 어느 것이 아파트시장 규모별 초과수익률을 잘 설명하는가를 시계열상에서 분석하였다. 분석결과 주식요인을 제외한 채권요인, 부동산요인, 거시요인이 각각 통계적으로 유의한 설명력을 가짐을 발견하였다. 또한 거시변수 1% 포인트 변화에 대한 아파트시장 초과수익률의 % 포인트 민감도 분석을 실시한 결과 아파트시장 초과수익률은 무엇보다도 3년만기 회사채수익률로 대표되는 금리변화에 대해 통계적으로 유의하게 음의 반응을 보인다는 사실을 발견하였다.
Fatigue Life Assessment for a Composite Box Girder Bridge
朴埈用,김호경 한국강구조학회 2014 International Journal of Steel Structures Vol.14 No.4
Two conventional methods, the nominal stress method and the hot spot stress method, are examined for the fatigueassessment of a steel box girder bridge while considering the effect of the modeling options on the estimated fatigue life. Twoanalytical models, a simplified global analytical model and a refined local finite element analytical model, are developed forthe evaluation of the stress ranges induced by a fatigue truck. The field tests are conducted for validating the analytical modelsas well as for direct fatigue assessment via an ambient vibration test. The local modeling options that are examined are theinclusion of the fillet weld itself in the refined analytical model and the mitigation of the concentrated stress at the web plate,considering stress dispersion over the width of the attachment. The fatigue life is estimated for three different nonexceedanceprobabilities, considering different partial factors according to the accuracy of the analysis method as well as the reliability ofthe estimated fatigue loading for a specific bridge site. Through a comparative analysis, the potential differences in estimatedfatigue lives according to the assessment methods and the modeling options are quantitatively discussed.
Erratum to: Fatigue Life Assessment for a Composite Box Girder Bridge
박준용,김호경 한국강구조학회 2015 International Journal of Steel Structures Vol.15 No.1
Two conventional methods, the nominal stress method and the hot spot stress method, are examined for the fatigue assessment of a steel box girder bridge while considering the effect of the modeling options on the estimated fatigue life. Two analytical models, a simplified global analytical model and a refined local finite element analytical model, are developed for the evaluation of the stress ranges induced by a fatigue truck. The field tests are conducted for validating the analytical models as well as for direct fatigue assessment via an ambient vibration test. The local modeling options that are examined are the inclusion of the fillet weld itself in the refined analytical model and the mitigation of the concentrated stress at the web plate, considering stress dispersion over the width of the attachment. The fatigue life is estimated for three different nonexceedance probabilities, considering different partial factors according to the accuracy of the analysis method as well as the reliability of the estimated fatigue loading for a specific bridge site. Through a comparative analysis, the potential differences in estimated fatigue lives according to the assessment methods and the modeling options are quantitatively discussed.