Papers by Author: Jung Hyun Park

Abstract: his study was prosecuted to analyze a structural resistance degradation model for the existing column in the 3-story building to be remodeled. The probabilistic random variables in this study were dealt with an initial member strength, current maximum crack width, current density and diameter of reinforcement with elapsed time and corrosion initiation time, TDRA has been performed to calculate the reliability index, the failure probability, the degradation level according to the member strength loss in reinforced concrete columns due to corrosion of steel reinforcement.

Abstract: The new composite method combined by fiber laminates and steel plate composites was applied for reinforced concrete members. The experimental investigation for the applicability of this method was presented for flexural member. Two different fiber materials such as carbon and fiberglass with steel plate were used. All specimen using fiber material and steel plate were divided by two different groups such as control group without strengthening, innovated fiber-steel laminate composites group. Failure modes and load-deflection curves were presented for flexural members by fiber-steel laminate composites. Numerical analysis for tested beam was investigated.

Abstract: The study of girder-to-column joints under experiment and numerical analysis was carried out to evaluate change of the flexural capacity of the joints with the 2-layer upper reinforcement of girder within rectangular section and the single-layered upper reinforcement at the girder flange. The distribution of the upper reinforcement of girder within the effective flange width was the variable in the experiment and numerical study. The ultimate strength of the specimen with 2-layer upper reinforcements of girder was larger than that of the single-layered specimen by maximum 17.4%. Based on the results of this experimental study, for the single-layered tension reinforcement it is recommended to provide 15% additional reinforcement at twice slab thickness on each side of the main girder to attain the flexural capacity equal to the 2-layered case.