Your internet browser is not using current security protocols.
This will soon affect your ability to use the ISA website.
To update your security protocols, turn on TLS 1.2 in Advanced settings or contact your system administrator.
ISA Logo
About ISA  •  Find an Arborist  •  Newsroom  •  Job Bank  •  Contact Us  •  LOGIN
Join ISA
    SCI cover
    ISA Members: $54.95
    Non-Members: $64.95
    Price in US Dollars

    Climbers' CornerTree Academy

    Does Taper Affect Bending Stress at the Base of Branches?


    As wind, snow, or ice builds up along branches, bending moments are created that increase proximally towards the branch base. Theoretically, maximum bending stress should be at the point of attachment, yet arborists report that storm damage often occurs near the base, rather than at the point of attachment. This reported failure pattern could be the result of branch taper, which may shift the maximum stress location distally beyond the point of attachment. This presentation will discuss a study that measures taper along a series of branches and then applies theoretical loading to the branches. Bending stress will be calculated at fixed locations along the proximal end of branches to predict where maximum stress occurs. This information may be useful to practitioner in understanding where branches fail, and to modelers when building tree failure models.

    Conference Proceedings Documents


    Dr. Gregory Dahle is developing the arboriculture and urban forestry program in the Division of Forestry & Natural Resources at West Virginia University. He holds a doctorate from Rutgers University, a Master and Bachelor of Science from Purdue University, and is an ISA Board-Certified Master Arborist. Dr. Dahle’s research utilizes allometric modeling and tree biomechanics to understand how urban trees grow and survive environmental loads such as those from snow and ice storms. He has worked as an arborist managing commercial and municipal tree care accounts in the San Francisco Bay Area and served as a consulting utility arborist with the Davey Resource Group throughout northern California. Additionally, he worked with the Bartlett Tree Research Laboratory.

    Climbers' CornerTree Academy

    ©International Society of Arboriculture 2009-2018
    PO Box 3129 • Champaign, IL 61826, USA • +1.217.355.9411

    Email comments and questions to ISA
    Sunday, February 25, 2018 9:34:14 AM (CST/ISA Headquarters Time)
    Please click here to view our privacy policy.