樹木拉力測試強度表

樹木拉力測試強度表

The FAKOPP pulling test 1. Introduction The stability of urban trees is a key question that affects everyone. Diseased and unstable urban trees pose much risk for everyone, and are a serious liability for municipalities in case of an accident. Tree stability and safety assessment is therefore of the utmost importance. In the meantime it tends to be much neglected in many areas. At present, the most accepted method for evaluating the safety and stability of trees is the pulling test. It involves applying a bending load on the trunk via a cable attached to the tree. The method can be used either to assess the uprooting stability of the tree (by measuring the inclination at the bottom of the trunk), or to establish the risk of trunk breakage (through measuring the bending stresses using extensiometers attached to the trunk). Both of these methods are introduced here briefly. 

樹木拉力測試

Table 1. Stuttgart table of wood strength (Wessolly and Erb 1998).

樹木拉力測試強度表

(Source: Wessolly, L., and M. Erb 1998. Handbuch der Baumstatik und Baumkontrolle. Patzer Verlag, Berlin, Germany.)

http://fakopp.com/docs/products/pullingtest/PullingTest.pdf