| Summary: | 碩士 === 國立中興大學 === 園藝學系所 === 104 === In this study, the branche-stem structure(BSS) as the object to understand the trees mechanics strategy to reduce the damage. Discusses three parts: geometry, topology and laminated structure. Study the effect on stress of changing the geometry of BSS, topology structure study the mechanical properties of configuration of BBS of the trunk. laminated structure study the rings arrangement of general branches and latent buds effect on the stress distribution. Establish a series of comparative model, static simulation analysis with finite element method. The results showed that when the angle of 90º is exposed the maximum stress, stress concentration at the saddle point. In many features, maximum stress occurs lacking a smooth connection, and consistent failure occurred in the case of V shape angle of visual tree assessment. Topology model, whorled layers increases the rigidity of trunk, but the upper whorls areas occurs stress concentration. The advantage is that when the wind blows off the tree let make the trees smaller to reduce the risk, rather than break from the trunk base caused more serious harm. Tree darker area of BBS on vertical cross-section overlapping the stress concentration area formed by a conical shell with BBS, in line with the stems rot even after hardening remaining pith cone shape.
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