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구봉근(Koo Bong Kuen),류택은(Ryu Taek Eun),이재범(Lee Jae Bum),류연종(Ryu Youn Jong),이철희(Lee Chul Hee),이현석(Lee Hyoun Suk) 한국구조물진단유지관리학회 2003 한국구조물진단학회 학술발표회논문집 Vol.- No.-
The impact factor of bridges is analyzed based on experimental data to examine the characteristics of the dynamic responses of bridges. The experimental impact factors are compared with the impact factor of Korean Highway Design Specification and Japan T-load in terms of the span length. According to the superstructural types of bridges, the variation of th impact factor is analyzed. When vehicles are passing on a bridge, the dynamic effect acts on the bridge impact factor more than at the time of design because of the velocity of vehicles, the surface roughness reduction due to the deterioration of the bridge deck pavement, and the disconnection of the bridge entrance and the expansion joint. Because the actual value is greater than the expected value at the time of design, the dynamic response of the bridge accelerates the deterioration of the bridge due to the accumulation of fatigue, and the bridge's life-time is shortened and can have an influence on the serviceability and safety of the bridge.
구봉근 ( Koo¸ Bong Kuen ),류택은 ( Ryu¸ Taek Eun ),이재범 ( Lee¸ Jae Bum ),류연종 ( Ryu¸ Youn Jong ),이철희 ( Lee¸ Chul Hee ),이현석 ( Lee¸ Hyoun Suk ) 한국구조물진단유지관리공학회 2003 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.7 No.1
The impact factor of bridges is analyzed based on experimental data to examine the characteristics of the dynamic responses of bridges. The experimental impact factors are compared with the impact factor of Korean Highway Design Specification and Japan T-load in terms of the span length. According to the superstructural types of bridges, the variation of th impact factor is analyzed. When vehicles are passing on a bridge, the dynamic effect acts on the bridge impact factor more than at the time of design because of the velocity of vehicles, the surface roughness reduction due to the deterioration of the bridge deck pavement, and the disconnection of the bridge entrance and the expansion joint. Because the actual value is greater than the expected value at the time of design, the dynamic response of the bridge accelerates the deterioration of the bridge due to the accumulation of fatigue, and the bridge’s life-time is shortened and can have an influence on the serviceability and safety of the bridge.
구봉근,김창운,류택은,이재범,류연종,이현석 충북대학교 산업과학기술연구소 2002 산업과학기술연구 논문집 Vol.16 No.1
This study was performed to investigate the strength characterstics of steel fiber reinforced recycled aggregate concrete. Test specimens were prepared with compressive, split tensile, flexural specimens and tested by ultimate strength. A superplasticizer and fly-ash were added to the mix to improve performance of recycled concrete. Test-variables are substitution of recycled aggregate(0, 30, 50%), steel fiber length(0, 30, 50, 60mm), steel fiber content(0, 0.5, 1.0, 1.5%). Test-specimen were classified by test-variables. The experimental results on the various engineering properties of steel fiber reinforced recycled aggregate concrete using waste concrete are summarized as follows. It was found that the compressive and split tensile strength were proportionally affected by quantities of recycled aggregate substitutions, but flexural strength wasn't. The maximum compressive strength was 392 kgf/㎠( series 4 : R30 L30 V1.0 A20 ), the maximun split tensile strength was 40 kgf/㎠( series 7 : R30 L30 V1.5 A20) and the maximum flexural strength was 62 kgf/㎠( series 7 : R30 L30 V1.5 A20 ).