Minimum shear reinforcements in footings
Minimum shear reinforcements in footings
(OP)
Hi all,
For the design of pad footings or rafts I use the equivalent beam approach for bending and shear design (and I check punching shear separately).
Using the beam approach i follow chapter 8 from AS3600.
Clause 8.2.5 (a) which require minimum shear reinforcement for sections deeper or equal to 750mm. I've never seen shear reinforcement on a pad footings even when deeper than 750mm. Is this because normally the shear at D from the face of the support (V*) is always less than phi*Vuc as per (ii)?
Perhaps this is an easy question but I just like to make sure that my understanding is correct.
Thanks
For the design of pad footings or rafts I use the equivalent beam approach for bending and shear design (and I check punching shear separately).
Using the beam approach i follow chapter 8 from AS3600.
Clause 8.2.5 (a) which require minimum shear reinforcement for sections deeper or equal to 750mm. I've never seen shear reinforcement on a pad footings even when deeper than 750mm. Is this because normally the shear at D from the face of the support (V*) is always less than phi*Vuc as per (ii)?
Perhaps this is an easy question but I just like to make sure that my understanding is correct.
Thanks





RE: Minimum shear reinforcements in footings
Trenno also posted something similar not too long back that would be worth a glance thru:
thread507-375602: Punching Shear / Pad Footings / Shear Rails
RE: Minimum shear reinforcements in footings
I'm not sure if this can be completely waived.
RE: Minimum shear reinforcements in footings
I would be using 8.2.5.ii. Minimum shear reinforcement requirements may be waived for slabs if V*<phi*Vuc
RE: Minimum shear reinforcements in footings
However there is always shear ligs in crane base even if the principle is the same.
Can't really explain why
RE: Minimum shear reinforcements in footings
RE: Minimum shear reinforcements in footings
In my experiences with crane base design the shear force is often less than phiVuc, as such no shear reinforcement is required but still specified.
I think that crane engineers are used to specify ligs on the crane base but in a lot of cases there is no real need for it.