deflection induced moments in struts bs5950

huangyhg

deflection induced moments in struts bs5950
does anyone know of any guidance given in bs5950 (or anywhere else) about the level of deflection in struts (say horizontal roof bracing) before i have to add extra moment due to compression in the member acting a distance from the original centreline of the member.
not a direct answer, but the attached shows the reduction of compression capacity with increasing length, for a selection of shs struts.
it shows that deflection due to self weight is significant for effective lengths between 2 to 4 m, for the shs sizes shown.
capacity design was done to as4100.
if my memory serves me correctly, the old version of bs5950 did have a clause which gave guidance on this. compression   
you should always check this until you have enough experience to know otherwise. it is always amazing how much a little bit of self weight reduces the axial capacity.
thanks all