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reaction on columns of space truss

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   when design of a space truss for conveyor belt in
an industry according to ASD. actually this is near
seashore area. wind load is the governing factor here.
space truss is 20 meter span(it is 20 meter truss
divided into 7 panels)and supported on four columns
placed at four corners. height of columns is 10meters
above the ground level. when wind load of 30kn is
applied laterally at each node point and analysis is
done through STAAD pro 2001 package. 

 an lateral force of 250kn is coming on top of each
column. this lateral load is very high and design of
columns section is also very high and costly.

please suggest the design and analysis 

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