Yui TSUKUDA

Influence of Mechanic Performance by Spatial Distribution of Deterioration of Materials of RC Member

SupervisorFTakumi SHIMOMURA

The corrosion of the internal steel material due to the chlorine damage is a typical deterioration phenomenon of a ferroconcrete structure. The outline of the deterioration process due to the chlorine damage: by water, oxygen, and the chloride ion's that is the corrosion promotion material invading, accumulating in concrete, and making the reinforced concrete on a concrete inside corroded. Mechanics performance of the material is deteriorated by the crack of concrete by the corrosion expansion pressure of the reinforced concrete, the decrease in the sectional area of the reinforcement and deterioration in the adhesion between concrete and reinforcement.
A lot of researches are done about the occurrence of the corrosion of the reinforcement and crack of concrete according to corrosion. It propose some models to forecast the relation between the amount of corrosion and the crack. Many of models by which forecast the relation between the amount of corrosion and the crack assume the amount of corrosion and the corrosion crack thoroughly in the material. However, both amounts of corrosion and the width of the crack are different in the actual phenomenon according to not the same but the position. The amount of corrosion of the steel material of the RC with which the steel material corrodes is a situation in which it doesn't understand whether for it to work at the safety side or even to work at a dangerous side though doesn't know what influence the non uniformity of the crack exerts on a structural side. Therefore, the result of analysis cannot finish being made the best use of results , It is not certain how to have to analyze it in detail even if a more detailed analysis is done Then, it was experimented that it analyzed to examine to predictable of deterioration due to corrosion in an easy analysis aiming to examine the application limit of the analysis that assumed corrosion it was axially the same in this thesis.
Thus, the load of the RC material with which the steel material corrodes by an easy bend analysis that gives material strength as a function of the amount of corrosion. It was confirmed technological meaning and axially of the forecast related to displacement to calculate by assuming axially the same it in a deteriorated RC material to non-uniform.