Square tubing calculation

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SUMMARY

The discussion centers on the structural integrity of using 4-inch square tubing (4x4) for a patio roof support system spanning 20 feet, with a load of approximately 700 pounds. The user plans to utilize hollow structural sections (HSS) with a wall thickness of 3/16 inches, anchored to a concrete pad using 1/2 inch concrete anchors and 6x6x1/4 inch steel plates. The county inspector has approved the plans, emphasizing the importance of submitting detailed drawings for compliance.

PREREQUISITES
  • Understanding of structural engineering principles
  • Familiarity with hollow structural sections (HSS)
  • Knowledge of load calculations and material properties
  • Experience with construction codes and building inspections
NEXT STEPS
  • Research structural calculations for 4-inch square tubing under load
  • Learn about the effects of span length on structural integrity
  • Investigate local building codes regarding patio structures
  • Explore methods for submitting engineering drawings for approval
USEFUL FOR

This discussion is beneficial for welders, machinists, structural engineers, and DIY enthusiasts involved in building patio structures or similar projects requiring knowledge of load-bearing materials and compliance with building regulations.

MFW
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Hello, I'm new to the forum. I am a welder and machinist. I am building a roof over my patio. For design reasons I want to use 4 inch square tubing for columns and cross beams. Will the 4x4 sag over a 20 foot span. There will be approximately 600 pounds of roofing materials it will be supporting
 
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Welcome to PF. :smile:

Did your city Building Department approve your plans?
 
Thanks for the reply, I talked to the county inspector and he said that it was legal to do what I want to do put I need to submit the drawings. I have drawn what I want, now trying to figure tubing size for structural integrity
 
MFW said:
4 inch square tubing
What is the material and the wall thickness? Can you upload a drawing (use the "Attach files" link below the Edit window)? What wind loading do you expect on this roof? How is it tied to your house?
 
My thought was hhs 4x4x3/16. Will be attached to the concrete pad with 1/2 inch concrete anchors (6×6×1/4 steel plates welded to the bottom of 4x4 columns. Will have to figure out the upload, not computer savvy hahaha. Basically 4 columns cover 12 ft wide x 19 ft long by 12 tall with 3 12 roof pitch. Metal roof and bracing about 700 pounds or less. Very little wind load because of surroundings and almost never any snow load being in the south
 

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