Concrete Half Joint

[asixth]

Hi guys

Has anyone got any typical details for a concrete slab half joint. I know how to design corbels and nibs by strut-tie and detailing bearings but I just wanted to know if there is anything special that I need to look out for.

The slab is rather large between permanent movement joints (>50m ; >160') so I am expected large shrinkage movements and seismic displacements will also be a factor.

Any tips will be appreciated.

Thanks

 

[rowingengineer]

generally the bearing strip has a maximum amount of rotation as well as movement it can handle.

depending on he thickness I like to detail u bars for the thinner corbels, using a N10 bar with a 4d pin. normally the bearing pad is place 25-50mm behind the star of the bend of the hook bar.

http://www.nceng.com.au/

"A safe structure will be the one whose weakest link is never overloaded by the greatest force to which the structure is subjected” Petroski 1992

 

[hokie66]

For some reason, I can't open the file or access engineering.com. Will try again later. I try to avoid these at all cost, as there is a record of lots of failures and maintenance issues. But yes, you use strut-tie and the bearing design is critical. Supervision during the construction is probably the most important thing...the best detail can easily be defeated by sloppy workmanship.

 

[hokie66]

Got the file open now. What your picture shows is not a halving joint...a halving joint is when the slab or beam is just split in half, and that is the type joint I was referring to.

Your corbel joint allows for access to the bearing from below, so much better than the halving type.

Don't forget the hanging bars in the supporting side.

 

[asixth]

Cheers guys

I opened a bearing catalogue and it was referring to it as a half joint so that is were I picked up the terminology. Not to mind. Corbel it is.