What’re the calculation of bridge girder launcher?
As installing bridge girder launcher but the guide beam suspending in the air, 
main girder has a larger stress at position of rear middle support leg,
max stress 204.7Mpa < allowable stress 240Mpa, strength meets the demand.
Max downward displacement at front part 53.14cm, allowable displacement
in China specification S/100=59.64cm, stiffness meets the demand. The value
should be considered as designing front leg. Buckling ultimate load
multiplier 1.535, strengthen main girder web plate at rear middle support leg.
