moving load command by staadpro

huangyhg

moving load command by staadpro
is any body can help me with staadpro command.
i have sent this problem to staadpro but no answer as usual.
my problem starts with a simple beam with 2 simple supports and i have a
span of 20 ft long ,load is 5 kips acts vertically. what i want is to
calculate my max. bending moment and the location using moving load
command.
the answer will be 5/2x20/2 = 25 kip-ft acts in the mid span.
if you are going to help me please do not apply self weight in the
calculation
i have received this answer from staad-pro supports.
it works but when i play around changing numbers for xinc from 1 to 0.2 i get different answer which i do not understand , i am waiting for their answer.the command was
define moving load
type 1 load 5 0.0001
dist 0.001
load 1 moving load
load generation 20
type 1 0 0 0 xinc 1
staad expects minimum two wheels for defining a moving load.in addition to the 5 kip load please specify another fictitious load of a very small amount, like 0.001 kip placed at a small ditance like 0.1 feet.
then apply the moving load in a way so that in course of movement it comes at the midspan of the beam.this will create the desired moment at the mid-span.

i think 0.2 is not working because load generation 20 should be 100 instead.
i tried it and it works.