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I am designing a transfer beam 10m long with a permissible deflection of 5mm at 1/3 locations. the reason for such an onerous design requirement is to suit precast cladding that will be sitting on the beam.
the beam is underneath an RC flat slab which picks up these load bearing precast panels.
my question is what load combination can I use to check for deflection.
If I were to design this as an RC element i could use the combination of 100% permanent and 30% variable for deflection as per Technical Report 58 from the concrete centre. seeing as the steel beam is picking up an RC flat slab which supports the precast elements I could see an argument for it!
the eurocode isn't very clear on what combinations to use for steel for steel deflection check.
BS EN 1991-1-1:2002, equation 6.2, page 23 allows a reduction factor for variable load depending on the number of stories supported. in our case it would 70%-80%
Looking forward to your assistance
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