Precomposite Dead Load deflection limits
Precomposite Dead Load deflection limits
(OP)
There are no hard and fast rules for the deflection of a composite steel beam under the weight of wet concrete (talking about unshored construction). Just wondering what engineers have come across and apply in their designs.
Do you limit the deflection at all, even if the beam is to be cambered? In other words, if you camber the beam for 80% of the dead load, do any problems develop if all of that camber (say 1-1/2" to 2" plus of deflection) all comes out when the wet concrete is placed. (We can tell the contractor to pour the slab to a set thickness, so having either ponding or a thin slab wouldn't be an issue for my question).
Thanks,
Do you limit the deflection at all, even if the beam is to be cambered? In other words, if you camber the beam for 80% of the dead load, do any problems develop if all of that camber (say 1-1/2" to 2" plus of deflection) all comes out when the wet concrete is placed. (We can tell the contractor to pour the slab to a set thickness, so having either ponding or a thin slab wouldn't be an issue for my question).
Thanks,






RE: Precomposite Dead Load deflection limits
Another issue is that you may want to provide short slotted holes in deep beams to accomodate the rotation that occurs as the camber comes out under load.
RE: Precomposite Dead Load deflection limits
RE: Precomposite Dead Load deflection limits
RE: Precomposite Dead Load deflection limits
Regards,
Lutfi
www.cdeco.com
RE: Precomposite Dead Load deflection limits
If propped, it may be easier to prop the beams also to eliminate deflection of the beams during your pour.
Just a thought.
VB