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[Civil] What do the components of Beam stress mean?

Question

What do the components of Beam stress mean?

 

Answer

When checking the results of the Beam element, the components of Beam Stress, Sax, Ssy, Ssz, Sby, and Sbz have the following meanings:

 

Sax

Axial stress in the element's local x-axis direction
Ssy Shear stress in the element's local y-axis direction
Ssz Shear stress in the element's local z-axis direction
Sby Bending stress due to the beam moment (Mz) in the element's local z-axis direction
Sbz Bending stress due to the beam moment (My) in the element's local y-axis direction

 

The values ​​of the above components that are displayed when you select Values ​​in Type of Display or check the results in the Table are the maximum absolute value within the defined stress range as shown in the figure below.

 

 The stress range mentioned above can be checked in Section Property.

 For example, Czp and Czm in the section property, as shown in the figure below, are the stress ranges of Sbz (y value of bending stress in the figure above). Cyp and Cym are the stress ranges of Sby. Additionally, Qyb and Qzb are the values of Q/b on the y and z axes respectively, in the figure above.

Sections defined in DB/User cannot be changed because the values ​​of data related to stress output described above are fixed according to section information.

However, for the section defined by Value Type, the stress output data can be changed to the desired value by the user in Section Properties.

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