Basic study on survived strength of bio-deterioration wooden materials and joints

目前还没有一种方法来评价木结构材料和木结构节点受白蚁、腐真菌等的侵蚀，为此，提出了加速木结构房屋真实的尺寸构件和木结构节点生物劣化的方法，并对其进行了存活强度评价。因此，我们能够确定如何制作真实的尺寸的木构件和接头，并能够积累生物退化木构件和接头的数据。此外，生物降解真实的尺寸材料的试验结果表明，超声波速度或钢钉穿透深度与材料的存活强度之间有很好的一致性。从生物劣化真实的尺寸接头试验获得的结果表明，当接头部分存在局部劣化时，存活强度大幅下降。

At present there is no method of evaluation of wooden material and joint attacked by termite or rot fungi and so on. Therefore, we proposed acceleration method of bio-deterioration for real size members and joint of wooden house, and evaluated the survived strength them. As a result, we were able to establish how to make a real size wooden members and joint, and were able to accumulate data of bio-deterioration wooden members and joint. In addition, the results obtained from the bio-deterioration real size material tests were shown a good agreement between ultrasonic velocity or penetration depth of steel pin and the survived strength. The results obtained from the bio-deterioration real size joint tests were shown that the large decrease in survived strength when there is localized degradation of the joint part.