MOMENT IN ETABS M11, M22, M1-1, M2-2
M11 moments refer to bending along the local 1-axis (also known as the major axis) of the shell element. This axis is usually parallel to the longest side of the element and is the axis along which the shell element experiences the most bending.
M22 moments refer to bending along the local 2-axis (also known as the minor axis) of the shell element. This axis is usually parallel to the shortest side of the element and is the axis along which the shell element experiences the least bending.
The M11 and M22 moments are used to model the in-plane bending behavior of the shell element. It's important to note that, in ETABS, shell elements can only bend in one plane, so the M11 and M22 moments are used to model the in-plane behavior of the shell element.
M 1-1 Moment is can be found in frame forces. M 1-1 is a moment about the Direction- 1.
M 2-2 Moment is can be found in frame forces. M 2-2 is a moment about the Direction- 2.
When analyzing a structure, the software will calculate the internal forces, deformations, and stress of the shell elements, and check if the structure behaves as expected. If the structure does not meet the design requirement, the model should be modified accordingly.
It's important to consult with a qualified engineer and check the building codes and standards of your region before making any calculations.
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