It is necessary to analyze the long-term stability of ancient wooden buildings. However, it is not practical to carry out real-time studies, so accelerated weathering tests have been devised to investigate the change of bending capacity of the wood. Each cycle consisted of seven steps, and it took one week to complete a cycle and the test was performed over nine weeks. There were decrease in the specific gravity and MC in the early parts of the test was due to reduction in the extracts. A great reduction in specific gravity of the specimens was observed after nine-weeks of accelerated weathering and the values of ultimate bending loads were consistent until the middle of the experiment. Finally, a sharp decrease in performance was seen among the test groups after nine weeks of accelerated weathering. Based on these facts, we have determined that the reduction in performance of wooden members is time dependent; therefore, it is necessary to establish a standard of performance assessment for existing buildings, through complementary testing of actual sites. In addition, further investigation using structural size member is required because only specific gravity greatly affects the strength in the case of small clear specimens.
|ジャーナル||Journal of the Faculty of Agriculture, Kyushu University|
|出版ステータス||出版済み - 9 1 2013|
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