What does it mean if a beam is said to have failed by plastic hinge mechanism, and which types or sizes of sections would be most likely to fail in this way?
In structural engineering beam theory the term, plastic hinge, is used to describe the deformation of a section of a beam where plastic bending occurs. In plastic limit analysis of structural members subjected to bending, it is assumed that an abrupt transition from elastic to ideally plastic behaviour occurs at a certain value of moment, known as plastic moment (Mp). Member behaviour between Myp and Mp is considered to be elastic. When Mp is reached, a plastic hinge is formed in the member. In contrast to a frictionless hinge permitting free rotation, it is postulated that the plastic hinge allows large rotations to occur at constant plastic moment Mp. Plastic hinges extend along short lengths of beams. Actual values of these lengths depend on cross-sections and load distributions. But detailed analyses have shown that it is sufficiently accurate to consider beams rigid-plastic, with plasticity confined to plastic hinges at points.
This Site Might Help You. RE: What is quot;plastic hinge mechanismquot;? What does it mean if a beam is said to have failed by plastic hinge mechanism, and which types or sizes of sections would be most likely to fail in this way?
