2.3.2 Evaluating tree structure
This section of the manual introduces the tree as a biomechanical structure and provides some simple principles for analysing defective structures and assessing the likelihood of failure .
The tree as a biomechanical structure
Trees are self-optimising mechanical structures that use a variety of inter-related mechanical strategies to support their own weight ( static loading ) and to dissipate wind loading ( dynamic loading ).
Considered as a static structure , the tree must be able to support the weight of all of its own components and foliage without breaking at any point in the structure and without uprooting .
As trees grow and accumulate weight , additional wood must be produced to support this weight . The amount of wood at a given point is normally roughly proportional to the load that it bears : thicker wood ( for example at the base of the trunk ) must bear proportionately greater load than the thin wood of fine branches .
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