Design Of Castellated Gantry Girder Program Info./Limitations ( Actual program is available in Super Civil CD )
Overhead electric traveling crane is assumed.
Structural steel design is as per Indian Standard No.IS:800-1984.
The gantry compound section consists of castellated ISMB, flange plates at top and bottom of castellated ISMB, an ISMC section is placed only at top. All Webs are assumed as un-stiffened. The distance between crab and Gantry is assumed as 1.00 M.
Permissible deflection is L/750 for crane capacity less than 50 t, and L/1000 for capacity more than 50 t.
Yield stress fy = 250 Mpa. E = 200000 Mpa.
Increase In stress factor is applied to permissible stresses, hence stress ratio is always taken as less than or equal to one.
Increase in permissible stress factor (MF) = 10 %.
Vertical impact factor = 25%.
Horizontal transverse force = 10% per rail.
Horizontal longitudinal force = 5% of static wheel load.
Only following ISMB and ISMC members are used in design.
MB 200	MB 250	MB 300	MB 350	MB 400	MB 450
MB 500	MB 600
MC 125	MC 150	MC 175	MC 200	MC 250	MC 300
MC 400