Load on construction rule before it breaks?

[MH1001]

By the way, what is an Ok deflection? We're talking about a temporary support so all I'm asking is for it to hold..

I read somewhere deflection=L/300 => 10000/300=3.3mm In my case. A 1-ton point load should be perfectly fine

I don't dare to comment on what is suitable sizing.

 

[Arne999]

Okay, but then I am probably on track at least when it comes to the calculation. It's probably just as you say that the beam is considered fixed ... I do have different solids for each part but I'm not really sure how the program interprets the contact... I have defined the boundary condition that the supports stand on a "fixed support"

 

[peternicklas]

My strong recommendation is NOT to use FEM unless you know it 100%. There's so much that can go wrong. Take out paper and pen and use that instead. In this case, the orientation of the material must be done so that the fibers in the wood are aligned correctly. Wood is a type of composite and specific elements are required in the FE program to be able to calculate it correctly.

 

[MH1001]

I probably agree with the above speaker. I never use FEM myself to derive a value for, for example, deformation or stress. However, I often use it to see which part(s) of a component are most stressed and to test optimizations of geometries.

 

[peternicklas]

I use it daily, but it requires a lot of knowledge in many different areas to understand the results. It is a very good tool if you can manage and understand it.

 

[Arne999]

Work with simulation of five daily, but not in durability so100 I'm not really.....

 

[ljungpiparen]

By the way, what is an acceptable deflection? We are talking about a temporary support so all I'm asking is that it holds...

I read somewhere deflection=L/300 => 10000/300=3.3mm in my case. A 1-ton point load should therefore be completely fine

A deflection greater than L/300 is experienced as uncomfortable.

 

[olahall]

I'm joining this discussion as I have a similar question.

I want to lay a beam diagonally across a wooden deck, about 6-7 meters long.
I want to use this as the highest point for a small plastic roof for rain protection (about 3 x 4 meters) over a sofa.

I would prefer to avoid a glulam beam... and a post in the middle of the deck.

Could one come up with a custom solution???

Have you received any good answers??