Shogo KIMURA

Experimental Study on Repairing Method for Corroded Steel Members by Carbon Fiber Sheets

Masatsugu NAGAI, Eiji IWASAKI


There are a lot of various reasons cause deterioration phenomenon of steel structures. In repair or reinforcement as measures to a steel structure that is deteriorated, an effective method of construction is strongly required under the constraint condition in service. It is remarkable to use the carbon fiber sheet as an appropriate material to repair and reinforce the structure. It is the situation in which technology development with its application is advanced in many fields. This study aims at the practical use of repair and reinforcement of steel structure with a carbon fiber sheet basing on basic experimental data for making the design and the construction indicator.

@The conclusions are summarized as follows.
‡@Understanding the dynamic characteristic of member reinforced by carbon fiber sheet
It could be confirmed to obtain the effect of reinforcement corresponding to the number of lamination layers until CFRP peeling occurred.
Moreover, it could be confirmed to design as synthetic section because numerical value and experiment value in compound rule of the parallel model type were almost corresponding.

@The reinforcement effect is confirmed, even if reinforcement length by CFRP changes till the peeling of CFRP occurs. As for the peeling, it is the tendency that is easy to peel as the number of the lamination layers increases.
‡AConfirmation the applications

The effect of reinforcement performs a tendency to grow by growing of the section loss part. At the result, it is thought that the load allotment rate of CFRP grows, and the strain of the steel material becomes small.
‡BBonding method of considering construction to established structure

If the CFRP bonding length is 70mm or more in, it could be confirmed that the effective stress transmits to CFRP. However, this is only result in the test limited to three CFRP lamination layers. It is thought that installing the standard of the basic material adjustment can control the variation of peeling load.