Today,Square Pipe Standards (Size, Constant Length, Strength, Characteristics)It is a note about.Commonly used square steel tubes used in structures, square steel tubes for general structural purposes: STKR
It is a type of square pipe,
- Carbon steel tubes for machine structural purposes (STKM) JIS G 3445
Carbon steel tubes used for machinery, automobiles, bicycles, furniture, apparatus, and other machine parts
- Carbon steel tubes for general structural purposes (STK) JIS G 3444
Carbon steel pipes used for civil engineering, construction, pylons, scaffolding, support pillars, landslide girders, and other structures
- Square steel pipe for general structural purposes (STKR) JIS G 3466
Square steel pipes for civil engineering, construction and other structures
What we usually refer to as "square pipe" will be "STKR".
The main content of this article is its STKR
- Sizes and standard lengths of square pipe available for purchase
- Tensile strength, yield point or proof stress
- cross-sectional area
- cross-sectional secondary moment
- section coefficient
- Cross-sectional quadratic radius
The following is a memo summarizing information from JIS G 3466 and other steel manufacturers on the following topics
Square Pipe (STKR) Specifications (Size, Constant Length, Strength, Characteristics)
Sizes available for square pipe (STKR)
Now, let us summarize the sizes of square pipe (STKR) available for purchase.
The length depends on the availability of the steel shop, so it is difficult to make a general statement, but as a reference, here are some examples
- 6m, 8m, 9m, 10m, 12m
I think there is a high probability that the above constant scale dimensions will be available.
Square Pipe (STKR) Characteristics
Next, the characteristics to note here are as followsThese characteristics of square pipes are used in the design process.
- Tensile strength, yield point or proof stress
- cross-sectional area
- cross-sectional secondary moment
- section coefficient
- Cross-sectional quadratic radius
The image is an image: too small to see, please download the excel sheet at the end of the article and check it there.
Supplement: What is the cross-sectional secondary moment (I)?
The sectional secondary moment is, Cross-sectional properties that describe the resistance of a member to deformation in response to bending forces. and is an index value for design strength, etc.These values in the above table are transcribed from the JIS G 3466 table.
Supplement: What is section coefficient (Z)?
The cross-section coefficient is,The cross-sectional secondary moment of that section divided by the distance from the figure center axis to the top and bottom edgesIt is. The section coefficient is a property of the cross section and is used to determine stress levels.This value is also transcribed from the JIS G 3466 table.
Supplement: What is the cross-sectional quadratic radius (i)?
The sectional secondary radius is also called the sectional radius of gyration,A coefficient necessary for calculating the strength of a member when it is subjected to axial compressive forces (mainly buckling calculations).It is.In this table above, the formula [i=√(I/A)] is used.
Finally.
Here you can download an Excel sheet on square pipe sizes and properties. The information is organized in a batch, so you can use it wherever you need it. (For information not listed here, please refer to JIS G 3446.)
That's it.