Tower Cabling Design Challenge - 3 Cable System

Tower Cabling Design Challenge - 3 Cable System The first step is to consider the forces acting on the tower. The following assumptions will be made regarding these force. lofl The maximum wind force acting on the tower will be F = 22 The wind force will be treated as a concentrated force acting at the top of the tower at point A The force is horizontal to the ground (parallel to the x-y plane) and will coming from a direction defined by angle e measured with respect to the positive x-axis. We will only consider 'Mnd directions acting between cables AB and AC (O' s e See diagram below The weight ofthe cables will be neglected. None of the cables ere pre-tensioned_ This means that if there is no wind force, the tension in the cables will be zero. The tower exerts an upward force on point A Th cable design D 1200 Lets consider the consiquence of the cable not being pre-tensioned. Considering the cables are not pre-tensioned and the wind force will be at angles directed between cables AB and AC, what is the magnitude of the tension in cable AD? Note: Cables can only exert a force while in tension. View Available Hint(s) Previous Answers Correct Since considering a case in which the wind force is exerted between cables Aa and ACI the tension in cable AC is zero and can be neglected in the calculation. This reduces the number of unknown forces acting at point Ato three: cable AS tension, cable AC tension, and the upward force from the tower The wind force is considered a known loading force As such, the free-body diagram of point A is the following: