The wheel load transferred from trolley to gantry girder is given by(a) W1 = [Wt(Lc+L1)]/(2Lc)(b) W1 = [Wt(Lc-L1)](2Lc)(c) W1 = [Wt(Lc-L1)]/(2Lc)(d) W1 = [Wt(Lc+L1)]/( Lc)The question was posed to me in an internship interview.I need to ask this question from Gantry Girders & Design of Industrial Buildings in section Gantry Girders, Design of Plate Girders & Industrial Buildings of Design of Steel Structures

The wheel load transferred from trolley to gantry girder is given by(a

1.	The wheel load transferred from trolley to gantry girder is given by(a) W1 = [Wt(Lc+L1)]/(2Lc)(b) W1 = [Wt(Lc-L1)](2Lc)(c) W1 = [Wt(Lc-L1)]/(2Lc)(d) W1 = [Wt(Lc+L1)]/( Lc)The question was posed to me in an internship interview.I need to ask this question from Gantry Girders & Design of Industrial Buildings in section Gantry Girders, Design of Plate Girders & Industrial Buildings of Design of Steel Structures
Answer» Right answer is (c) W1 = [Wt(Lc-L1)]/(2Lc) The explanation is: Since trolley moves on the crane girder along the span of truss, its weight is transferred to the crane WHEELS as the AXLE load and finally to gantry girder. The wheel load transferred from trolley to gantry girder is given by W1 = [Wt(Lc-L1)]/(2Lc), where W1 is load of each wheel on gantry girder, Wt is weight of trolley or crab CAR, Lc is DISTANCE between gantry giders, L1 is distance between centre of GRAVITY of trolley and gantry.

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