Regarding the presence or absence of ductility in bending joints of steel structures

Regarding the presence or absence of ductility in bending joints of steel structures

The third part:
It should be noted that this specification (previous sections) also refers to Partially Restrained (PR) joints. These connections are considered to exhibit significant inelastic behavior. Therefore, ductility is a direct design consideration when using semi-fastened joints.
Do we expect ductility from bending joints? yes absolutely Steel is an inherently malleable material, and even the least malleable elements in the steel design (usually considered welds) have a significant level of malleability. Honestly, even after years of doing such tests (tests on flex joints), we regularly underestimate the ability of welding to redistribute loads without sudden complete loss of the weld. While there are certainly things that can be done to increase or decrease ductility, there will always be a small amount of ductility in the joints of steel structures. The figure below shows the torque-rotation response curve and the characteristics of stiffness, resistance, and ductility of jointed, clamped, and semi-clamped joints, which you can see the difference in their responses. continues
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