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I have defined springs on the upper flange of my crane runway beam laterally. Now, the allowable deformity is calculated on the distance of the springs, how can I change it?


For crane runway girders that are supported laterally by a semi-rigid spring (Schlingerverband), we set Method 3 under Details under "Permitted Deformations". With this, the length for the determination of the allowable deformation is related to the inflection points of the deformed member axis.
If you want to relate the allowable deformation to the length between start and end support, you have to calculate it manually.


Allowable horizontal deformation Ringer's Association Lateral support Spring on top chord

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