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LOADS ACTING ON GANTRY GIRDER 1. Vertical loads from crane  Self-weight of crane girder  Hook load  Weight of crab (trolley) 2. Impact load from crane :  As the load is lifted using the crane hook and moved from one place to another and released at the required place, an impact is felt on the gantry girder.  Impact loads are taken as deemed in clause no. 6.3 of IS 875 (part 2) – 1987 3. Longitudinal horizontal force along the crane rail (Drag force) :  Due to starting and stopping of the crane girder moving over the crane rails since the crane girder moves longitudinally i.e. in the direction of gantry girder. This force is known as braking force or drag force  Drag force shall be considered in accordance with clause no. 6.3 of IS 875 (part 2) 1987 4. Lateral force (Surge load) across the crane rail :  They are caused due to sudden starting or stopping of the crab/trolley when moving over the crane girder.  Lateral forces are also caused when the crane is dragging weights across the floor of the shop.  Lateral force shall be considered in accordance with clause no. 6.3 of IS 875 (part 2) 1987