inverted L-Beam effective width
inverted L-Beam effective width
(OP)
Hey Guys,
might be a stupid question, but are the formulas for calculating the effective flange width of an inverted L beam the same as for a standard L beam? All the examples I have seen are when the flange is in compression. Basically I have an upturn at a slab edge and want to know how much slab steel can be used for Ieff and for ultimate calcs.
Cheers
might be a stupid question, but are the formulas for calculating the effective flange width of an inverted L beam the same as for a standard L beam? All the examples I have seen are when the flange is in compression. Basically I have an upturn at a slab edge and want to know how much slab steel can be used for Ieff and for ultimate calcs.
Cheers






RE: inverted L-Beam effective width
Not sure I understand your question.
RE: inverted L-Beam effective width
RE: inverted L-Beam effective width
RE: inverted L-Beam effective width
RE: inverted L-Beam effective width
RE: inverted L-Beam effective width
RE: inverted L-Beam effective width
I use 4 times the slab thickness but your code will give an empirical equation for what width can be used.
And L-beam, be it upstand or downturned will need to be designed for positive and negative moment in general concrete design.
RE: inverted L-Beam effective width
As I think you are in Australia, there is a provision in AS3600, Paragraph 8.1.10.2, which requires that "tensile reinforcement shall be well distributed...". What "well distributed" means is the question. It is advantageous for crack control and for placement of the concrete to place some of the bars outside the web. Have a read of what Warner et al say about it. My 1998 edition has a relevant section "Cross-sectional details" on pages 809 and 810.
SEIT is correct about the ACI provisions. Section 10.6 requires part of the tensile reinforcement to be distributed outside the web, within 1/10 of the span for T-beams. I suppose for an L-beam, that would mean 1/20 of the span.
The width of flange used for compression and the distribution of tensile reinforcement into the slab are really separate issues.