Column kern
Column kern
(OP)
How do I calculate the kern radius for a reinforced L-shaped concrete column?
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RE: Column kern
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RE: Column kern
Mike McCann
McCann Engineering
RE: Column kern
RE: Column kern
This is a common point to get when constructing an interaction diagram for a column.
RE: Column kern
The diamond will be centred on the centroid of the section.
RE: Column kern
For example, if you consider an L bent about its x-axis, there will be a different eccentricity that causes 0 strain in the top fiber than the eccentricity that causes 0 strain in the bottom fiber.
RE: Column kern
I think you are talking about lines, and I am taking about areas. The kern is the area inside these boundary lines.
RE: Column kern
RE: Column kern
RE: Column kern
RE: Column kern
RE: Column kern
RE: Column kern
Therefore, you need to define this boundary in your section, i.e. ultimate compressive strain at one end and 0 strain at the other - this is right on the cusp of allowing tension in the section, but there isn't any yet.
Once you define this in your section, just use the strains to determine the net axial force and net moment.
This will give you the combination of axial load and moment that will define the edge of your kern. Now that you have an axial load, P, and a moment, M, you can determine the eccentricity of the axial load without the moment (M=Pe, or e=M/P). This eccentricity is the maximum eccentricity that can be applied to your section without causing tension in the section. That is the definition of the kern.
RE: Column kern
RE: Column kern
RE: Column kern