Beams with axial loads

 

Consider the case where a beam has both an axial load and a bending moment. If the axial load passes through the neutral axis for pure bending, the axial load will not contribute to additional bending and one can consider the loading as a linear superposition of pure bending and uniform extension.

 

 

Eccentric axial load:

 

If the axial load is applied such that its line of action is not on the neutral surface for pure bending, then this axial load results in bending. Such an eccentric load can be replaced by an equivalent that is on the neutral surface and bending moment as shown in the figure.

 

Once the equivalent system is constructed, then one can use the above method of superposition to calculate the stress.

 

 


Mehrdad Negahban and the University of Nebraska, 1996-2000.

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Department of Engineering Mechanics, University of Nebraska, Lincoln, NE 68588-0526

Last modified at: 9:04 AM, Monday, March 06, 2000