how mutch shytalkz?

[noseall]

how mutch weight will timber floor joists take?

the joists are 170 x 47mm.

the clear span is 3.6m.

one end of the joists is bricked in with 100mm bearing.

the other is on galv' joist hangers (sturdy build-in type, not jiffy).

joists are spaced at 400mm centres.

 

[Shytalkz]

Point load? UDL? Long/medium/short term load?

 

[noseall]

Point load? UDL? Long/medium/short term load?

short term, spread and dead.

 

[Shytalkz]

Assuming self weight of the floor and joists at 0.5kN/m2, then long term loading to it can be 1.435kN/m2 to limit deflection to 0.003xL.

If deflection is not a criteria, can take 1.59kN/m2 at bang on maximum stress, deflection is over at 11.665mm, against allowable of 10.841mm, so it's hardly going to crack everything!

I didn't put the usual 0.9kN point load in that a joist check would also have to satisfy.

 

[Shytalkz]

Read the reply Shytalkz

For short term load, satisfying deflection gives the same load as above (obviously!); for maximum stress, load is 2.65kN/m2, deflection is 17.544mm.

 

[noseall]

the reason for the post is, i have just craned 7 tonnes of materials onto the first floor joists ready to load onto the second lift of scaffolding.

in all fairness there has only been 15mm of deflection.

there are no central bracings yet and the loads are centred near the joist bearings. we have also propped the odd acro beneath.

 

[noseall]

p.s. we planked out the entire joist layout first.

 

[Thermo]

bit late to ask after youve done it!

 

[^woody^]

Not really.

He wants to know now as otherwise, he will have to get to work an hour earlier tomorrow to start carrying the gear up the ladder from the ground floor.

 

[noseall]

i'm off to Portugal golfing in 8 hrs so i will chat when i get back.

see y'all soon.