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| Applies To | ||

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| Product(s): | STAAD Advanced Concrete Design | |

| Version(s): | All | |

| Environment: | N/A | |

| Area: | Concrete Design | |

| Subarea: | Column & Shear Wall | |

| Original Author: | Shreyanka Bhattacharjee Bentley Technical Support Group | |

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**Does RCDC calculate the Effective length factor automatically or it is user defined? Is it same for all columns in model or different?**

RCDC identifies the sway or Non-sway frames factor as per storey stiffness and storey index. It calculates relative stiffness of the beams and columns as per column orientation. It calculates the effective length factors as per available charts for Sway and Non-sway. Effective length factor would be different for all columns as per calculations. Option of overriding effective factor is available to user. User also can apply single factor to all columns on one click. For more information refer Topic “Effective Length Factor” for column from help Content.