Large angle fixed to wall
Large angle fixed to wall
(OP)
Hi everyone,
I'm a sign maker and have a sign to fix but I'm not sure if I'm going a bit too far. I'm hoping to fix a 4mm piece of folded steel 340mm x 340mm , 2 metres in length to brickwork with 5 sleeve anchor bolts, which are 80 mm down from top, spaced equally. Is it asking too much? Any input would be appreciated.
Robert.
I'm a sign maker and have a sign to fix but I'm not sure if I'm going a bit too far. I'm hoping to fix a 4mm piece of folded steel 340mm x 340mm , 2 metres in length to brickwork with 5 sleeve anchor bolts, which are 80 mm down from top, spaced equally. Is it asking too much? Any input would be appreciated.
Robert.





RE: Large angle fixed to wall
From your post I take it that the 2m length is sitting horizontal. Secondly what sort of weight is this angle taking apart from its own and how far out from the wall does
this weight act? Finally what size bolts are you using?
If the 2m is horizontal and all bolts are 80mm down from the top of one face of the angle then all the bolts will share the load equally.
If the 2m is vertical then all the bolts will experience different loads.
Please clarify your situation.
regards
desertfox
RE: Large angle fixed to wall
The angle is horizontal and will support an aluminium 'tray' sign (like a box lid) which is 2350mm x 575mm, 3mm thick with 145mm returns and will slide on to the end of the angle. The bolts I have are 10mm x 85mm and I've been told they will 'hold a house up' but I'm looking for other opinions. I'll be drilling into brick, not masonary.
Many Thanks,
Robert6172
RE: Large angle fixed to wall
I have calculated the loads on the bolts assuming that they are 10mm diameter.The weight of steel angle is about 42.5kg and that of the aluminium tray 17.69kg.
Assuming that the aluminium tray exerts its weight at a distance of 314.5mm from the wall and that of the steel at 86.49mm from the wall I calculate a tensile load of 70N in each bolt and a shear load of 118N on each bolt.
These loads are quite small for say an M10 bolt and produce
very low stresses so if the bolts themselves shouldn't fail, however I do not know how good an adhesion the bolts have in brick nor do I know the bolt material you are using and finally will the aluminium lid be subject to any other loads ie:- wind load which might increase the bolt forces.
regards
desertfox
RE: Large angle fixed to wall
There won't be much wind hitting the box and apparently these bolts have good adhesion into brick. I'm thinking about a bolt all the way through to the other side with a large washer. This is a lot more work but would hopefully do the trick, but if the first method will suffice then would like to stick to that. The bolts appear to be a pale straw colour - maybe galvanised and were purchased from Turner Fixings in Sale, Manchester.
Thanks again,
Robert6172.
RE: Large angle fixed to wall
Thanks good luck with your project.
desertfox
RE: Large angle fixed to wall
ZCP
www.phoenix-engineer.com
RE: Large angle fixed to wall
If the brick are hollow, you may have a hard time getting the sleeve anchor to grab, and may damage the brick if the bolts are overtightened. You might consider a small epoxy anchor, such as the Hilti HIT HY 20. I only mention Hilti because I am used to their product. There are many out there from other manufacturers that are quite acceptable.
Absolutely look in to the minimum required edge distances and spacings of the bolts to help prevent damage to the brick and possible premature failure of the bolts. You're loads are very small it seems, but I would stick to the manufacturer's recommendations anyway if it were me.
RE: Large angle fixed to wall
These applied loads are minuscule. So the vast majority of shear pull-out stress (on the brick material) will be due to your bolt installation preload. What bolt installation torque do you plan to apply when you install your bolts? Just ensure it doesn't exceed the maximum recommended installation torque for your particular anchor in brick (nor half the tensile ultimate strength for your bolt material). Perhaps check hilti.com technical library if you have a login account, to see if they state a maximum allowable installation torque for your anchor in hollow brick. What is the property class of your M10 bolt (stamped on the bolt head)?