Development of a modeling method for the strength decreases and collapse process of wooden structures by the decay in progress

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Wooden houses and wooden bridges attacked by fungi lose their stress resistant ability and suffer by serious damages in the case of severe earthquake.However there had been few means to predict the progress of the degradation. In this research, the decreasing process of wood density was precisely examined, and it was clarified that the decay progress velocity has an anisotropy between fiber direction and transvers directions. The relationships between density loss and compressive or tensile strength were also obtained. By summarizing these results, I proposed a method of modeling of the decay progress and strength reducing progress for wood.