haunched beams, and framed bents may be computed by a procedure. I. LETAL. *See H. M. Westergaard, “Deflection of Beams by the Conjugate Beam Method.

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The conjugate-beam method was developed by H. Note that, as a rule, neglecting axial forces, statically determinate real beams have statically determinate conjugate beams; and statically indeterminate real beams have unstable conjugate beams.

From Wikipedia, the free encyclopedia. Below is a shear, moment, and deflection diagram.

Conjugate beam method – Wikipedia

The displacement mtehod a point in the real beam is numerically equal to the moment at the corresponding point in the conjugate beam. Essentially, it requires the same amount of computation as the moment-area theorems to determine a beam’s slope or deflection; however, this method relies only on the principles of statics, so its application will be more familiar.

Corresponding real and conjugate supports are shown below.


The following procedure provides a method that may be used to determine the displacement and deflection at a point on the elastic curve of a beam using the conjugatr method. Here the conjugate beam has a free end, since at this end there is zero shear and zero moment.


To make use of this comparison we will now consider a beam having the same length as the real beam, but referred here as the “conjugate beam. Views Read Edit View history.

Retrieved 20 November For example, as shown below, a pin or roller support at the end of the real beam provides zero displacement, but a non zero slope. The basis for the method comes from the similarity of Eq.

Conjugate beam method

From the above comparisons, we can state two theorems related to the conjugate beam: Upper Saddle River, NJ: To show this similarity, these equations are shown below.

Conjugate beam is defined as the imaginary beam with the same dimensions length as that of the original beam but load at any point on the conjugate beam is equal to the bending moment at that point divided by EI.


This page was last edited on 25 Octoberat Retrieved from ” https: Jptel drawing the conjugate beam it is important that the shear and moment developed at the supports of the conjugate beam account for the corresponding slope and displacement of the real beam at its supports, a consequence of Theorems 1 methid 2.

By using this site, you agree to the Terms of Use and Privacy Policy. Consequently, from Theorems 1 and 2, the conjugate beam must be supported by a pin or a roller, since this support has zero moment but has a shear or end reaction.

The slope at a point in the real beam is numerically equal to the shear at the corresponding point in the conjugate beam.

When the real beam is fixed supported, both the slope and conjugae are zero.