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강섬유를 사용한 철근콘크리트 보-기둥 접합부의 내진 성능
허민욱(Heo Min-Wook),김우석(Kim Woo-Suk),권우현(Kwon Woo-Hyun),김성기(Kim Sung-Ki),신종학(Shin Jong-Hack),곽윤근(Kwak Yoon-Keun) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.4
This paper deals with the earthquake-resistant capacity of reinforced concrete beam-column joints with steel fiber. Eight beam-column joint specimens (including control specimen) were experimentally evaluated to determine improvements in earthquake-resistant capacity. Test parameters in this experimental study are concrete compressive strength (24, 59 MPa) and volume ratio of steel fiber (0, 0.3, 0.6, 1%). RC beam-column joint specimens were tested under reversed lateral cyclic load. Considering concrete compressive strength and volume ratio of steel fiber, maximum strength, initial stiffness, shear strength and energy dissipation capacity of test specimens were evaluated. The results show that the earthquake-resistant capacity of specimens with steel fiber improve than that of specimen without steel fiber. and we did compare experiment results with ACI352R-02 and Tang`s equation.
鄭英暢,許敏旭 湖西大學校 工業技術硏究所 1991 工業技術硏究所論文集 Vol.10 No.-
The objectives of this study are to find out the characteristics of the ceramic heater, and to utilize them in developing other kind of semicoductor that will be used as heating materials. The characteristics of the current-voltage in P. T. C. are in accorance with the change of hyperbolic curves, and the characteristics of the voltage-temperature are saturated and equilibrated at 60[V]- 70[V]. About two minutes later, the ceramic heater operates normally as a heater. The ceramic heater is consmed with less power than any other kind of the heater. However, the effect of heat in the heater is as much as othc heaters, and it is safe enough from a fire caused by over heating. There is no noise and no poisonous gas when the fuel is burning. But, the cell of ceramic is not so easy to manufacture, and that is the problem we have to solve in the future.