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Why are the effective length factors which are reported for
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the Indian design code
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so high?
AAnswer: In ETABS 9.6 and later versions ETABS computes effective length factors are computed based on Wood’s Charts as required by according to Wood's Charts, which is consistent with IS:456 requirements. So the A column effective length computed by ETABS is same as required by IS:456. The effective length of a column depends on how much rotational stiffness is available at column ends. If the effective length is coming too high please check factor is dependent upon the rotational stiffness available at member ends. If an effective length is higher than expected, the flexural stiffness of beams connected to it. In most cases program will be able to compute effective length factors correctly even for those columns which are of double height or receive numerous beams in the story height. If you come across a case when effective length factor doesn’t appear correct then you can use Design overwrites to assign it manuallyinterconnecting beams should be checked. Design-overwrite options are available for manual assignment of values, though computation is typically successful regardless of model complexity, as with double-height columns or conditions with numerous interconnecting beams.