Design Of Angle 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 two angles each at top & bottom, flange plates at top and bottom of angles, an ISMC section is placed only at top. All Webs are assumed as unstiffened. The distance between crab and Gantry is assumed as 1.00 M. Gap between web plate and top flange angles is assumed as 10 mm.
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 ANGLE and ISMC members are used in design.
40 x 40 x 6	45 x 45 x 6	50 x 50 x 6	65 x 65 x 6	65 x 65 x 8	65x 65 x 10
75 x 75 x 6	75 x 75 x 8	75 x 75 x 10	80 x 80 x 6	80 x 80 x 8	90 x 90 x 6
90 x 90 x 8	90 x 90 x 10	90 x 90 x 12	100 x 100 x 6	100 x 100 x 8	100 x 100 x 10
100 x 100 x 12	130 x 130 x 10	130 x 130 x 12	150 x 150 x 12	200 x 200 x 16	200 x 200 x 20
MC75	MC100	MC125	MC150	MC175	MC200
MC250	MC300	MC400