Dimensioning of hollow square and circular rod

AI Thread Summary
To determine the dimensions of square and circular hollow rods for a telescopic assembly, the load type—whether axial compression, tension, torque, or sideways deflection—must be considered. The design must balance outer dimensions and wall thickness while accounting for applied loads, including compression and bending. The specific application involves supporting a boat in a rack, factoring in both the boat's weight and wind forces. For a rod length of 2.26 m, suggested dimensions for the circular rod include options ranging from 155 mm outer diameter with 10 mm wall thickness to 216 mm with 5 mm thickness. Proper dimensioning is crucial for ensuring structural integrity and safety.
JohnnyR
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Hi

Can someone tell me how to determine dimensions for a square hollow rod and circular hollow rod when the material and maximum load is known?
 
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This will depend on the way the load is applied to the hollow member.
Is it axial compression or tension, torque or a sideways deflection ?
There is also a trade-off between outer dimension and wall thickness.
 
The applied load is compression and there is also bending.
It´s a telescopic rod with the circular rod inside the square rod and it´s standing vertically with an angle. The rod has to support a boat standing in a boat rack so it has to support the weight of the boat and the force from wind gust. The material is set to be S235JR Low Carbon Steel.
I hope you can help. Thanks.

http://imagizer.imageshack.us/v2/1024x768q90/833/drpm.jpg
 
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JohnnyR: If the length of your telescopic rod assembly is 2,26 m, and if your member forces in post 3 are correct, then it currently appears the round tube would need to have cross-sectional dimensions (outside diameter by wall thickness) as listed in any of the following options.

(1) 216 x 5 mm
(2) 197 x 6
(3) 182 x 7
(4) 171 x 8
(5) 155 x 10​
 
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