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Capacity Image AddedCapacity Design is a design process in which it is decided which objects within a structural system will be permitted to yield (ductile components) and which objects will remain elastic (brittle components).

 

Once ductile and brittle systems are decided upon, design proceeds according to the following guidelines:

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  • Brittle components are designed to achieve sufficient strength levels such that they may satisfy strength-based demand-capacity ratio.

 

It is best to implement Capacity Design because structural performance is then a deliberate intention of the designer, and not revealed in a secondary manner by computational tools. Further, because of the many sources of uncertainty inherent to structural modeling and analysis, unless ductile systems are predetermined, a computational tool may not accurately indicate which systems will achieve inelastic response. In summary, Capacity Design enables the creation of a more reliable computational model, which should lead to better structural design.

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