Browse Forums Renovation + Home Improvement 1 Oct 03, 2020 10:19 pm Hi All, I’m a landscaper and currently renovating my own house in Brisbane. This is the first time on the site so looking forward to receiving feedback and ideas, thanks in advance.. My question relates to a suspended slab at the rear of my property and the length the channel beams around the edge of the slab can span between posts. The house was Originally a single story weatherboard dwelling before being raised in 1993 and clad with double cavity brick. A large suspended slab deck was also added (see pics). In the pics you can see a Besser block pillar in between 2 of the gal steel posts. The block pillar used to act as a chimney for a bbq which was located at its base. That said it is very solid and appears to have been there when the slab was poured (not put in after). I have the original plan (see pic) and the chimney/concrete pillar isnt included in the footings for the suspended slab. That said I’m a little reluctant to remove it given the weight of the structure (I plan to open the area up so the block pillar has to go - or at least be replaced with a steel post). The channel beam between the 2 gal posts in the picture is 400mm deep(inc slab) by 350mm wide. The slab depth is 100mm. The span between the steel posts is 4.5m. Not sure if it matters but the height of the posts is 2.2m. I’m wondering (if like timber) there is a span table available for concrete channel beams such as these? The structure appears well built, no cracking at all, Concrete is healthy and tied into the house (not freestanding). I’m keen to jackhammer the besser post out ASAP and get on with the reno. Any advice or ideas on spam tables or who to contact would be greatly appreciated! Thanks Nick Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Outside looking inLike ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Underside of channel beam350mm wide x 400mm deepLike ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Under looking outWidth between steel posts is 4.5mLike ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ 1994 reno/building planArea of interest circled in blue on left sideLike ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Re: Concrete channel beam span - suspended slab 2Oct 03, 2020 10:49 pm Noticed the resolution in some of the pics wasn’t great so added a few more below... Nickson76 Hi All, I’m a landscaper and currently renovating my own house in Brisbane. This is the first time on the site so looking forward to receiving feedback and ideas, thanks in advance.. My question relates to a suspended slab at the rear of my property and the length the channel beams around the edge of the slab can span between posts. The house was Originally a single story weatherboard dwelling before being raised in 1993 and clad with double cavity brick. A large suspended slab deck was also added (see pics). In the pics you can see a Besser block pillar in between 2 of the gal steel posts. The block pillar used to act as a chimney for a bbq which was located at its base. That said it is very solid and appears to have been there when the slab was poured (not put in after). I have the original plan (see pic) and the chimney/concrete pillar isnt included in the footings for the suspended slab. That said I’m a little reluctant to remove it given the weight of the structure (I plan to open the area up so the block pillar has to go - or at least be replaced with a steel post). The channel beam between the 2 gal posts in the picture is 400mm deep(inc slab) by 350mm wide. The slab depth is 100mm. The span between the steel posts is 4.5m. Not sure if it matters but the height of the posts is 2.2m. I’m wondering (if like timber) there is a span table available for concrete channel beams such as these? The structure appears well built, no cracking at all, Concrete is healthy and tied into the house (not freestanding). I’m keen to jackhammer the besser post out ASAP and get on with the reno. Any advice or ideas on spam tables or who to contact would be greatly appreciated! Thanks Nick Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Outside looking inLike ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Underside of channel beam350mm wide x 400mm deepLike ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Under looking outWidth between steel posts is 4.5mLike ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ 1994 reno/building planArea of interest circled in blue on left sideLike ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Re: Concrete channel beam span - suspended slab 3Oct 04, 2020 9:57 am Nickson76 I’m wondering (if like timber) there is a span table available for concrete channel beams such as these? The structure appears well built, no cracking at all, Concrete is healthy and tied into the house (not freestanding). I’m keen to jackhammer the besser post out ASAP and get on with the reno. Any advice or ideas on spam tables or who to contact would be greatly appreciated! Thanks Nick Hey Nickson76 Welcome to the forum No There are no span tables for Concrete beams, concrete structures are required to be designed and certified by a structural engineer to AS3600. From the information you have attached it appears the BBQ stack doesn't form part of the structure, If you have any doubts contact a local engineer to do a quick site inspection. Often the built structure Doesn't match the certified engineering Drawings. OT the days of spans table acceptance for CDC for Timber and Steel Structures are also limited, Tougher regulations now require proper engineering certification... Basically people are just accepting fake engineering tables off the internet and the way to put a stop to it is to toughen regulations Cheers Chris Designer,Engineer (Civil,Const & Envir),Builder,Concrete & Masonry Contract.Struct Repairs Yeah mine about 9 metres long and 8 wide with slope of 25% at one point but the end point of the outlet is past the side of garage and if he concretes allowing for… 4 4537 Need to remove glass panel out of concrete without wrecking the glass to get the spa room in, any recommendations on how to do that. Thank you 0 39046 Hi, Really struggling to find some consistency amongst Span Tables, can anyone help… 0 2666 |