Slab edge supporting steel balcony
Slab edge supporting steel balcony
(OP)
Can anyone tell me how to design and connect steel balcony to the edge of the slab?
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Slab edge supporting steel balcony
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RE: Slab edge supporting steel balcony
Th fix it to the slab it wil usually be bolted either to the top surface of the balcony slab at the front edge, or onto the front downstand face of the concrete slab.
The anchors wil usually be mechanical wedge anchors or resin anchors, both of which are drilled and fixed into the concrete. The design of the fixings are usually given as standard design examples in the product literature of the bolt manufacturer. These manuals are often given out free or are on the web. the companies which you should probably visit first are: Hilti, Spit, Rawlplug, Parabolt, Fischer.
Regards
Andy Machon
RE: Slab edge supporting steel balcony
Just another way to get the job done.
RE: Slab edge supporting steel balcony
RE: Slab edge supporting steel balcony
RE: Slab edge supporting steel balcony
Now the issue is one of designing and anchoring the handrail. First the handrail has to withstand a lateral concentrated load by most codes. Further, both a lateral distributed load and vertical distributed load must be accommodated by most codes. Don't forget to check the wind load...it can be significant, particularly at upper elevations and near coastal applications. Don't forget the little things like picket spacing...must typically comply with a life safety codes as well as building codes.
Next consider the materials for the handrail. If aluminum, be careful of dissimilar metal contact, contact between the aluminum and the concrete, and "electrical" continuity between the rail, the fasteners, and the reinforcement in the concrete. If steel, less problem, but still a consideration.
Then comes the anchoring....wedge?, epoxy?, embedment?
All will work, just different considerations for each. Near the edge, wedge anchors have lower capacity than epoxy anchors because of compensation for "blow-out" at edge. For rail post embedment, be sure not to trap water or even condensation in the post or on the surface surrounding the post. This will lead to corrosion and premature failure. Horror stories abound, including death!
RE: Slab edge supporting steel balcony
RE: Slab edge supporting steel balcony
RE: Slab edge supporting steel balcony
RE: Slab edge supporting steel balcony
RE: Slab edge supporting steel balcony
I assume that you have checked the existing concrete slab for the new balcony load.
My preference for fixing in such cases is to extend the new steel beams as far under the existing balcony as possible so as to maximise the favourable lever-arm. Also, at the slab edge fix into the vertical slab face rather than underneath so that the bolts are working in shear rather than pure tension.
I also assume that this work will be checked by an experienced structural engineer.
RE: Slab edge supporting steel balcony
Anchor the member (e.g., a channel) to receive the framing to the slab edge with undercut anchors or epoxy anchors. Follow the embedment, edge distance, shear strength, pull-out strength, spacing, etc. requirements for the anchor you choose.
The projected edge of the balcony is supported by tension rods tied back to the floor above (connected to the channel of the floor above, which is tied to the slab). This way, no momemt connection is needed at the slab edge to support the balcony steel, and the connections are simpler.
When detailing, pay attention to the effect of water and freeze/thaw over the long term. You do not want water to damage the slab edge or the anchors and compromise the strength of your connections.