CONJUGATE BEAM METHOD NPTEL PDF
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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Conjugate beam method – Wikipedia
The displacement of a point in the real beam is numerically equal to the moment at the corresponding point in the conjugate beam.
The slope at a point in the real beam is numerically equal to the shear at the corresponding point in the conjugate beam. This page was last edited on 25 Octoberat Here the conjugate beam has a free end, since at this end there is zero shear and zero moment.
When the real beam is fixed supported, both the slope and displacement are zero. 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.
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Below is a shear, moment, and deflection diagram. Views Read Edit View history. Retrieved from ” https: 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. When 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 and 2.
From the above comparisons, we can state two theorems related to the conjugate beam: To show this similarity, these equations are shown below. To make use of this comparison we will now consider a beam having the same ocnjugate as the real beam, but referred here as the “conjugate beam.
The basis for the method comes from the similarity of Eq. Corresponding real and conjugate supports are shown below.
From Wikipedia, the free encyclopedia. Conjugate beam is defined as comjugate 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. 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.
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.