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deflection limits for crane runway girders

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43  Crane Runway Girders -- Limit States Design 8. Def lection Limi ts Limits are imposed in AS 1418.18 on vertical and lateral deflections of the runway s for the purpose of obtaining sati sf ac tory service performance of the crane. The following deflection limits for runways and monorails under serviceability loads, using dynamic factors of 1.0: Vertical deflection due to the maximum wheel loads and level supports: ∆ z = L∕5 00 but not mo re than 60 mm (L /300 fo r cantile ve rs ) V ertical settlement plus axial shortening of a support column: ∆ z = L∕1000 but not more than 10 mm Lateral deflection of the top flange of a top running crane, measured from the chord: ∆ ty = L∕6 00 but not more than 20 mm Lateral deflection of the bottom flange of a monorail beam (author’s additional recommendation): ∆ by = L∕500 but  ≤ 20 mm Dif fere ntial lat eral defl ect ion between two neig hbouring frames (aut hors recommendation) *: ∆ fy = L∕600  * this is necessary to prevent damage to crane from raking. (a) V erti cal def lection li mits (c) Horiz ont al def lection on crane runway L/1000 but 10 mm <  Axial shorte ning Settlement L/500 but < 20 mm (b) Column top displac ement limit (d) Hori zontal deflection of a monor ail beam L ∕500  L c ∕300∕60 max L ∕600 L c ∕300 Plan View L c

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Deflection limits for crane runway girders

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  • 43 Crane Runway Girders -- Limit States Design

    8. Deflection Limits

    Limits are imposed in AS 1418.18 on vertical and lateral deflections ofthe runways for the purpose of obtaining satisfactory serviceperformance of the crane. The following deflection limits for runwaysand monorails under serviceability loads, using dynamic factors of 1.0:

    Vertical deflection due to the maximum wheel loads and level supports:

    z = L500 but not more than 60 mm (L/300 for cantilevers)Vertical settlement plus axial shortening of a support column:

    z = L1000 but not more than 10 mmLateral deflection of the top flange of a top running crane, measuredfrom the chord:

    ty = L600 but not more than 20 mmLateral deflection of the bottom flange of a monorail beam (authorsadditional recommendation):

    by = L500 but 20 mmDifferential lateral deflection between two neighbouring frames (authorsrecommendation) *:

    fy = L600* this is necessary to prevent damage to crane from raking.

    (a) Vertical deflection limits (c) Horizontal deflection on crane runway

    L/1000but 10 mm


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