Expansion Joint for Crane girders

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The ideal place for the braced bay is half-way between the expansion joints in the crane runway girder, or in the middle of the building, This arrangement prevents the build up of axial compressive forces due to temperature rise, which could cause buckling of the crane runway girders. Furthermore, it forces the expansion in two directions, and thereby minimises the total movement. Only the columns below the crane runway girder are deformed. It is the magnitude of the secondary stresses associated with this deformation which limits the distance between the expansion joints. The maximum allowable distance between the expansion joints depends on the horizontal longitudinal displacement capacity of the columns bearing the crane runway girder