Built-up welded cross-sections

Built-up members are used when a single member would not be sufficient or when the slenderness ratio is too high and resulting in excessive vibrations or when a built-up member would reduce the complexity of the connection.

The procedure for insertion of a built-up cross-section into a project is identical with the procedure for any other cross-section type; the user just have to specify the type in the type-selection dialogue, then choose the appropriate shape and size, and oversee or change the required parameters.

As for any other cross-section type, the sectional characteristics such as sectional area, moment of inertia, position of centroid, etc. are calculated automatically by the program. The user may input or modify other cross-section parameters such as material, name, etc.

In addition to the basic sectional characteristics, the program also calculates, designs and displays data such as:

• shape of a wall stiffener,

• diagram of warping lines,

• diagram of shear stress distribution over the cross-section for a unit force acting in Y-direction,

• diagram of shear stress distribution over the cross-section for a unit force acting in Z-direction,

• centre lines of the cross-section.

Note: Some of the above mentioned data depend on the shape of the particular cross-section. Therefore, some of the values may not be available for some of the cross-section shapes.

Sample cross-sections