Bending Tubes with Feet: Efficient Calculation in English Units

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SUMMARY

The discussion focuses on the calculation of bending tubes using English units, specifically feet and psi. It is established that all dimensions in the bending equation must be consistently expressed in the same unit system. The user compares a steel tube to a Douglas fir 2x8 for deflection under a uniform load of 1000 lbs across a 7 ft length. The application involves a 12 ft x 12 ft gazebo roof with an 18-degree pitch, emphasizing the need for accurate material properties such as section modulus and Young's modulus for both materials.

PREREQUISITES
  • Understanding of bending equations in structural engineering
  • Familiarity with material properties like Young's modulus
  • Knowledge of unit conversion, particularly between inches and feet
  • Basic principles of load distribution in structural applications
NEXT STEPS
  • Research the calculation of bending stress using the formula σ = My/I
  • Learn about the properties of steel versus wood in structural applications
  • Explore the implications of using different unit systems in engineering calculations
  • Study the design principles for roof trusses, particularly in gazebo structures
USEFUL FOR

This discussion is beneficial for structural engineers, architects, and anyone involved in designing and analyzing roof structures, particularly those considering material alternatives for trusses.

Physics_Kid
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so when i use english units to calc bending so i use Feet for all dimensions?
 
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Perhaps you could elaborate a little?

Bending tubes should work just fine in any measuring system.
 
well, if i use english system (feet, psi, etc) i suspect i have to stay in those units for all variables in bending equation. if my tube is 1x1x0.125 inch then i convert that to feet?? so 1/12 x 1/12 x 1/96 ?? i am comparing steel tube to doug fir 2x8 for deflection of uniform load W across length(L) 7ft where W=1000lbs. i have section and young's modulus of each material, etc. my application is a roof truss but looking to use steel tube instead of 2x8 wood, its a 12ft x 12ft gazebo roof with approx 18 degree pitch.
 

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