Square tubing calculation

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Discussion Overview

The discussion centers around the structural integrity of 4-inch square tubing used in a patio roof design. Participants explore the suitability of this material for supporting a specified weight over a 20-foot span, considering factors such as material type, wall thickness, and environmental conditions.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Homework-related

Main Points Raised

  • One participant, a welder and machinist, inquires whether 4x4 square tubing will sag under a load of approximately 600 pounds over a 20-foot span.
  • Another participant asks for details about the material and wall thickness of the tubing, as well as expected wind loading and how the structure is tied to the house.
  • The original poster mentions using HHS 4x4x3/16 tubing and describes the structural setup, including concrete anchors and steel plates, while noting the low wind and snow load conditions in their area.

Areas of Agreement / Disagreement

Participants have not reached a consensus on the adequacy of the proposed tubing size and configuration, and multiple viewpoints regarding structural integrity and design considerations remain open for discussion.

Contextual Notes

Details regarding specific load calculations, material properties, and local building codes are not fully explored, which may affect the assessment of the proposed design.

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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