Q#$1$:

A continuous beam is connected to an extension beam by a hinge. The internal hinge in a

continuous beam is not practically used. However, in indeterminate structures, when one point

is plastic, the plastic point becomes a hinge. This is covered in the relevant lecture in this

course. The given beam is statically determinate. For calculation, use the energy method. Check

the results with what you get from the moment diagram analysis in Homework#$2.$ Assume $L=$

$3m,$ and ${}_y=250$MPa.

Determine the magnitude of plastic force $P$ that can be applied to the beam.