Effect of Environmental Condition on Mechanical Properties of Some Living Broadleaf Trees.

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  • 自生する数種の広葉樹の力学的特性に及ぼす環境条件の影響
  • ジセイスル スウシュ ノ コウヨウジュ ノ リキガクテキ トクセイ ニ オヨボ

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Abstract

In order to clarify the mechanical behavior of living trees, bending tests were carried out. Two sites in the Miura peninsula where wind blows second strongestly in Kanagawa Prefecture, one site at the tip of the peninsula and the other in a valley about 300m inland, were chosen for the study. The mechanical properties (σm, εm and Um: stress, strain and strain energy at maximum load) were determined by three point loading bend test. The species in bending were Enoki (Celtis sinensis var. japonica), Mochinoki (Ilex integra), Hisakaki (Eurya japonica), Tobera (Pittosporum tobira), Masaki (Euonymus japonicus) and Yabunikkei (Cinnamomum japonicum).<br>The experimental results obtained can be summarized as follows:<br>(1) σm were not independent of the part or branch size of the tree.<br>(2) εm decreased with an increase in sample size.<br>(3) σm was higher in stronger wind than in weaker wind.<br>(4) Um was higher in stronger wind than in weaker wind.<br>(5) The ratio of the strain energy per volume Um/V to σm·εm/24 did not depend on wind conditions, so σm·εm/24 could be a mechanical index for the particular species.<br>(6) Um/V was in proportion to εm.

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