木材の老化に関する研究 : (第 1 報)法隆寺建築古材の機械的性質

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  • Studies on the durability of wood : I Mechanical pro erties of old timbers. (Horyuji Temple construction timbers Chamaecyparis obtusa ENDLICHER)

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In this studies the mechanical properties of old timbers were tested in comparison with new timbers to research the change of Properties of wood for many years. The test pieces were taken from Horyuji Temple which was build of wood (Chamaecy paris obtusa ENDLICHER) for about 1,300 years ago. The results obtained by this test are as follows. [I]Various mechanical strength. The strength are shown on table 7.[II]Relation of Various mechanical strength and moisture content. (1) Result of compression test is shown in fig. 6. (2) Result of bending test is shown in fig. 7 and 8. (3) Result of impact bending test is shown in fig. 9.[III]Specific gravity, moisture content and shrinkage. Results are shown on table 9.

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