formwork design

[jayni26]

does anyone have concrete formwork design calculation examples in metric? better if you could help me with a spreadsheet. thank you!

 

[Qshake]

There are many references for you to look up, and if you intend to spend much time with formwork design, to purchase as well.

Temporary Structures in Construction by Robert Ratay.
Construction Planning, Equipment, and Methods by Peurifoy

Formwork for Concrete Structures is also available by Oberlender and Peurifoy (2010).

You can create your own spreadsheets based on these texts and will be much more informed.

Good luck.

Regards,
Qshake

Eng-Tips Forums:Real Solutions for Real Problems Really Quick.

 

[CANPRO]

I also find "Formwork for Concrete" by M.K. Hurd useful as well.

In addition to the reference texts, you will need the appropriate code as well which will give you the required factors of safety and allowable deflections for the different elements in your formwork/shoring.

Spreadsheets can be a very useful tool, but I don't think they're going to help you much with formwork design. Formwork design tends to be a lot of quick and dirty calculations. Typically, once I have the allowable loads for your various components (i.e. plywood, strings, beams, frames, posts, etc...)I sit down with a sharp pencil, blank paper and a calculator. A spreadsheet may be useful in calculating allowable loads for the various elements, but once they're done just tape them to your wall. Formwork is all about keeping it simple and repetitive. An efficient layout for formwork and shoring should not require an extensive analysis.

It is not practical to design formwork down to the last fiber of wood, because what you design is going to be different than what gets built. There will always be situations on site that you cannot account for on paper, and they're always going to mix and match the material they have on site to get the job done. Your design needs to work in the simplest of terms. If a stringer is shown 2-span on paper, make sure it works single span. On the flipside of that, expect that some beams might become 2-span, in which case you have increased the load on the middle support. If you're worried about a particular beam/frame becoming overloaded, add an additional shoring post. Mistakes in concrete are expensive, shoring posts are cheap.