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

概要

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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 300 m inland, were chosen for the study. The mechanical properties (σ_m, ε_m and U_m : 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 integral), Hisakaki (eurya japonica), Tobera (Pittosporum tobira), Masaki (Euonymus japonicas) and Yabunikkei (Cinnamomum japonicum).The experimental results obtained can be summarized as follows:(1)δ_m were not independent of the part or branch size of the tree.(2)ε_m decreased with an increase in sample size.(3) δ_m was higher in stronger wind than in weaker wind.(4)υ_m was higher in stronger wind than weaker wind.(5)The ratio of the strain energy per volume υ_m/V to δ_m・ε_m/24 did not depend on wind conditions so δ_m・ε_m/24 could be a mechanical index for the particular species.(6)υ_m/V was in proportion to ε_m.
1993-03-15