It is important to continue to use the wooden house for the environmental protection. In Japan, there are a lot of traditional wooden houses, temples and shrines. Therefore it is seemed that to increase the use of these constructions become the environmental contribution. In particular it is important to increase in the general old houses except the houses of cultural assets, temples and shrines. Some of structural members and joints have been damaged by the biodeteriorations induced by the fungi, the termites and so on, however these wooden houses already use steel connectors for the reinforcement and repairing of members or joints. In this case, it is very important to evaluate the residual strength of structural members and joints for houses in use with long term safety, and decide when repair or where replace of the members and joints should be undertaken, because. It is difficult to know the survival strength of
members and joints