Delection limits for cantilever frame 1

[ajay__re]

Hi,

Consider the case of a cantilever frame as seen in the attached picture.

When you consider the roof beam as an individual beam with one end fixed, I consider the vertical deflection limit as span/250.

What would be the vertical deflection limit of the roof beam when the whole frame deflects under wind load? (Say European standards)

Thanks in advance

 

[Italo01]

I don't know about the european codes but the brazilian codes consider the deflection of the beam end with respect to the beam start, i.e., with respect to the beam local system.

 

[HTURKAK]

Typical vertical deflection limit for cantilever =span /180 and horizontal deflection ( sway ) of single storey columns = H/300.

I think superposition of the effects will be reasonable . For point load, tip deflection Δ = PL^3/3EI
and angular rotation at the top θ = PL^2/3EI
and the tip deflection of the cantilever beam due to rotation will be = L/200

⇒ Δ max =L/200+ L /180 say L/100