1Trees and Statics: Non-Destructive FailureAnalysisErk Brudi/ Philip van WassenaerTraditional tree risk assessment is focussed on determining the extent of cavities or hollowness in treetrunks by boring holes. Using these invasive tree assessment methods can not only damage living cells butmay also encourage fungal growth (LIESE, DUJESIEFKEN, 1996) and the spread of decay.New engineering based statics integrating methods (SIM) developed by WESSOLLY and SINN at theUniversity of Stuttgart allow for non-invasive and precise assessments of a tree ́s breaking and uprootingsafety. Statics integrating inspections are carried out with pulling tests (elasto-inclino method) that exert awind substituting load on the tree usin g a winch and a steel cable. The reaction of the stressed trees undera defined load is measured with high resolution devices (elastometer and inclinometer) and the dataobtained are compared with those of sound trees. In all safety calculations using the SIM, three majorcomp...