Expert/source verification requiredEdition-dependent or normative details must be confirmed against the adopted standard and National Annex before project use.
Hierarchy of resistanceDuctile and brittle modesPlastic hingesProtected elementsOverstrength
Learning objectives
In this lesson
- Choose the mechanism before isolated member sizing.
- Protect brittle modes from credible ductile resistance.
Engineering explanation
Capacity design identifies regions allowed to yield and derives actions for brittle or non-dissipative components from the credible resistance of those regions. Actual resistance can exceed nominal demand because of material, section and system effects. The aim is a stable, inspectable mechanism. Capacity-protected elements therefore follow applicable capacity-design action rules rather than reduced elastic-analysis action alone. Analysis, reinforcement design, detailing and execution quality are inseparable.
Key takeaways
What to carry forward
- Choose the mechanism before isolated member sizing.
- Protect brittle modes from credible ductile resistance.
- Analysis and detailing are inseparable.