Article Figures & Data
Figures
- Figure 1.
Accident site: the arborist’s position in the canopy (a, b), broken branch in the canopy (c), and the anchoring equipment on the ground after the arborist fell (d).
- Figure 2.
Details of the studied branch: (I) free-body diagram, (II) anchoring positions, (a) longitudinal view, (b) cross section, (c) basal longitudinal section, and (d) longitudinal section and extraction positions of the bodies of proof.
- Figure 3.
Free-body diagram. BP: branch break area (red); A: rope support area; S1 and S2: lanyard support points (dark grey).
- Figure 4.
(a) the shear stress as a function of the movement angle (= 1 = 2) of the mobile support straps (lanyard). (b) the shear stress as a function of D1, the distance between the breakpoint and the first mobile support straps.
- Figure 5.
Comparison of shear stress if both sides of the lanyard moved together (black line) or just the right side (red line), closer to the branch’s breaking point.
- Figure 6.
3-dimensional map of the shear stress variation as a function of the change in position of the lanyard and the movement angle (= 1 = 2).
Tables
- Table 1.
Values of green density, modulus of elasticity, and modulus of rupture for the samples extracted from the damaged branch. MOE = Modulus of Elasticity; MOR = Modulus of Rupture.
Fragment Sample Green density (kg/m3) MOE (MPa) MOR (MPa) 1 A 845 1,567.90 8.32 B 807 3,608.03 34.28 C 847 4,090.57 33.36 2 A 787 3,852.90 40.46 B 796 3,427.20 38.71 C 781 4,865.31 35.26 3 A 768 3,884.81 27.41 B 661 912.31 6.97 C 749 3,957.46 34.77 4 A 828 3,881.97 38.15 B 826 3,655.06 32.15 Mean 796 ± 53.1* 3,853.00 ± 1,151* 34.3 ± 11.6* ↵* Standard deviation
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