Dimensioning of hollow square and circular rod

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SUMMARY

The discussion focuses on determining the dimensions for square and circular hollow rods made of S235JR Low Carbon Steel, specifically for a telescopic rod assembly supporting a boat. The load conditions include axial compression, bending, and lateral forces due to wind. JohnnyR provides specific cross-sectional dimensions for a circular rod, suggesting options of 216 x 5 mm, 197 x 6 mm, 182 x 7 mm, 171 x 8 mm, and 155 x 10 mm based on a length of 2.26 m and the applied forces.

PREREQUISITES
  • Understanding of structural mechanics, particularly axial loads and bending moments.
  • Familiarity with material properties of S235JR Low Carbon Steel.
  • Knowledge of hollow section design principles.
  • Experience with load calculations for structural applications.
NEXT STEPS
  • Research "Hollow Section Design for Steel Structures" to understand design principles.
  • Learn about "Load Calculation Methods for Structural Members" to apply appropriate forces.
  • Explore "Material Properties of S235JR Low Carbon Steel" for better material selection.
  • Investigate "Bending and Axial Load Interaction" to optimize rod dimensions.
USEFUL FOR

Structural engineers, mechanical designers, and anyone involved in the design of load-bearing structures, particularly those working with hollow sections in construction or marine applications.

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
 
Last edited by a moderator:
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​
 
Last edited:

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