09-10-2012, 12:44 PM
Electricity Transmission Tower
Electricity Transmission Tower.ppt (Size: 2.75 MB / Downloads: 87)
Introductions
Electricity is produced in generators and is being sent many kilometres by transmission lines or cable throughout the whole of Australia
Objectives
Using Strand 7 to analyse :
Tension and Bending within the structure.
Locate the maximum deflection of the structure.
And the interaction force between the two towers.
Choice of Software
Comparing Strand 7 & Microstran
Strand 7 offer a better view of stresses within the structure comparing to Microstran
Strand 7 provide more functions (like hydrostatic loading, cable free length and plate to beam conversion etc) within the software comparing to microstran
There the choice of software used
“Strand 7”
Methodology
Firstly plot a 2D layout of the tower
Mirror the 2D the rear part of the tower
And plot both side of the tower as the front and the rear is different from the sides
Connect the internal truss manually
Lastly draw the wings for the tower
Deflection result
Tower is treated as a cantilever condition
From the AS4100[D/h <=1/125 ], the maximum allowable deflection should be less than 0.208
Actual deflection observed from strand 7 are -0.0027, -0.0654, -0.0038 for x, y and z direction respectively
Conclusion
The Observed deflection values is within the Australia limitation
The axial stress is less than the yielding stress of the material
Bending moment and shearing force has very little effect in the structure
Tensile and compression is satisfactory within the axial force of the member
Therefore our analysis is relevant to the actual structure