Parabolas, Rectangles, Triangles & Snakes (Part 5)

Part 5 – Centroids, More Integrals…. In the last post we went through a process to find a general force integral which involved knowing the width and height of the stress block in terms of how far from the neutral axis depth you are. Then by using numerical integration methods we would be able to calculate the concrete force by evaluating this integral. Note that except for certain cases like a constant stress or constant width I don’t think you…

Parabolas, Rectangles, Triangles & Snakes (Part 3)

Part 3 – Class Hell Week At some point I came to the realisation that I’m going to need classes in my code, I didn’t know what they were exactly, but I needed them! Everyone else used them, so I must have them and they seemed the solution to a number of limitations I was coming up against or problems that needed solving according to good old google. So I split up my code and copied it to the four…

Parabolas, Rectangles, Triangles & Snakes (Part 2)

Part 2 – Bits & Pieces of Geometry A large part of the previous issues I was having with implementing a tool like this in Excel is the fact you have to generate your own routines (or find suitable ones by others) for all the geometrical calculations required to assess a given section at any given angle of loading or neutral axis angle. Simple shapes is probably ok, but it get exponentially harder as things get more complex in terms…

Parabolas, Rectangles, Triangles & Snakes (Part 1)

Part 1 – Prelude So for a while I have been playing around with the idea of creating some kind of tool for the analysis, design and detailing of reinforced concrete sections. In the past I have used SPColumn at a previous employer (that could afford it) for the analysis of concrete members, and some other basic free tools at those employers that could not. I’d also started (and stopped) a few times working in Excel to develop my own…