Effect of Geometry Precision and Load Distribution on Branch Mechanical Response

Tree risk assessment requires mechanical response studies, but simplification of the shape, material, or boundary conditions is necessary when dealing with such complex structures. To observe overall tree response, sub-structuring to several levels detail can be used, enabled by recent developments in numerical methods and three-dimensional laser scanning (3D scan). This study aimed determine an appropriate level geometry loading allowed for high-order branches at crown border, which useful analysis structured models. Four higher-order were pruned experimentally tested single-point loading. Beam solid finite-element models (FEMs) created based on measured geometric parameters detailed 3D scans, respectively. The FEMs used analyze seven scenarios force applied (a) center gravity, (b) top side branches, (c) key discrete points, (d) uniformly whole volume (to each finite element). Force was distributed ratios weighted according mass, area, diameter branches; mass element. results showed no significant difference between beam model scan-based model. elements’ mass-based distribution deviated significantly from those other scenarios. most simplified caused a deviation deflection curve. case bending moment related given architecture. Therefore, not considered always appropriate. Consistency branch provided representative recommended further modeling trees sub-structuring.