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최광진,장일영,권종주,송재호 金烏工科大學校 1994 論文集 Vol.15 No.-
The object of this study is to present an analytical method using superposition of displacement due to flexural crack and diagonal tension crack in reinforced concrete members. Flexural displacement caused by bending moment could be found by the double integration of curvature derived from the relationship between moment and curvature. The macro model of shear deformation from the viewpoint of diagonal tension crack occurrence and its development has been developed. The rotational angle due to diagonal tension crack could be evaluated by using strain compatibility, force equilibrium and moment equilibrium. Furthermore the bonding characteristics between concrete and steel as well as the characteristics of dowell have been taken into consideration. The theoretical values calculated using the analytical method developed in this study have been investigated in comparison with the experimental ones which were carried out earlier in order to prove it s validity. From the results it has been shown that theoretical values agree quite well with experimental ones, and it could be pointed out that presented analytical method is widely acceptable for the practical analysis of flexural displacement of reinforced concrete members.
원전 주기기 피로평가 알고리즘 최적화를 위한 보수성 부여 방법론 연구
김완재(Wanjae Kim),권종주(Jong Jooh Kwon),정일석(Ill-Seok Jeong),김태룡(Tae Ryong Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
New fatigue usage calculation algorithms recently developed in KEPCO Research Institute are now in the process of computerization and scheduled to be delivered as software package named FEMS (fatigue evaluation and monitoring system) soon after program verification and validation. Algorithms are designed in such way that they can give accurate and optimized fatigue usage to estimate more realistic component life. In order for calculated usage to be reliable and applicable, usage factor should ranges between two values: one that is calculated using finite element method, likely to be accurate for most cases but computationally expensive and the other that is obtained with design transient conditions assumed, likely to be too conservative. More desirably, it is required for algorithm that it be able to control the level of conservatism of the result. Proposed method in this paper characterizes plant transient signals such as fluid temperature or internal pressure and calculates representative parameters that are then to be used as input values in fatigue life evaluation. With these critical parameters, level of conservatism in fatigue usage calculation results can become predictable thus desired level of conservatism can be obtained effectively.