If a material is stressed beyond its elastic limit, the conditions of elasticity theory are no longer
met and nonlinear material behavior must be taken into account for further load increase.
A method that can be used to describe the system behavior in a simplified way, taking into
account this plastic material behavior up to the maximum ultimate load, is the so-called plastic
hinge method.
In common literature, it is usually assumed that bending moments are the decisive component
for reaching the yield strength fy, resulting in pure moment plastic hinges. Interaction with
other internal forces is either completely neglected or taken into account by reducing the
plastic limit moment using appropriate interaction relations.
In this thesis, the general plastic hinge method with moment joints will be derived first. Subsequently,
based on this, it will be developed how normal force and shear force joints can also
be considered within this theory. Finally, an interaction relationship of the internal forces will
be derived, which is associated with the formation of full plastic hinges.
The derived results are additionally implemented and validated with the help of a static calculation
tool in Python.
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If a material is stressed beyond its elastic limit, the conditions of elasticity theory are no longer
met and nonlinear material behavior must be taken into account for further load increase.
A method that can be used to describe the system behavior in a simplified way, taking into
account this plastic material behavior up to the maximum ultimate load, is the so-called plastic
hinge method.
In common literature, it is usually assumed that bending moments are the decisive component
for reac...
»