A break point can save the site

Discussion in 'Design, Development and Standards Discussions' started by Wireless Estimator, Feb 1, 2008.

  1. Wireless Estimator

    Wireless Estimator Administrator Staff Member

    A highly sought after lease area can oftentimes be elusive when the required height of a self supporting tower is too tall to meet fall factor requirements that state that the property dimensions in any direction must be, measured from the center of the tower, 10% greater than the height of the tower. Many code officials will approve the structure when a break point design is provided, but check with them first before you incur any additional expenses. The process requires the tower's design engineer to identify under local code requirements the weakest area of the tower where failure would likely occur during overstressed conditions. Although there is no guarantee that the structure will fail at this point and collapse within the owner's property, the probability becomes significantly increased when a fall factor design is included and documented by an engineer with proficiencies in theoretical break point presentations. The fall factor design requires that once the weakest section of the tower is identified, the sections immediately below it are increased in wall thickness or leg diameter along with corresponding bracing. The over-designed tower will probably remain standing while others fail, but if it did collapse it would be in a confined area. These designs elevate your engineering, manufacturing and foundation costs, but can benefit the client and the community.

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