# A crane runway has small cantilevered girders at the start and end, so that the wheels go as far as to the column. In these areas, the deformations show invalid values. What should I do?

According to the current recommendations, the deformation analysis for a cantilevered crane runway girder is performed using the formulas:

$\mathrm{δz}\;\leq\;(2\;\cdot\;l_{\mathrm{cantilever}})\;/\;\mathrm{allow}.\;\mathrm{deformation}$

$\mathrm{δz}\;\leq\;\mathrm{allow}.\;\max.\;\mathrm{deformation}$

In this case, the program cannot distinguish whether the design for the analyzed crane runway girders is irrelevant or not. This decision must be made by an engineer.

Usually, a simple note in the structural analysis is sufficient for an examiner. Alternatively, you can consider whether such a girder is even relevant for the design of the entire crane runway girder and, if necessary, neglect it when entering the geometry.