The mesh still has some (7) bad elements in sence of nonpositiv jacobian (for me). But it may run in ccx anyway. Mesh has 245870 tets and 87 MB ... 1) Maybe we should try square x-section rather than round. The shape doesn't matter too much. It's just a way to introduce an internal load. 2) We coul...

BTW: this stuff of this topic is awesome ! We need to get this into FreeCAD result object ! I think it is of practical value and a great learning experience for me on how to write Python and integrate it with FreeCAD using the FC API. I am now trying to clean importToolsFem.py up and write a Macro ...

Did you combine beam and bars into BooleanFragments object with type turned to CompSolid?

Thanks Thomas. I will give it a try. Did you try to mesh this model?

@Harry: About prestressing. When you use straight prestressed rebars, you get a negative constant moment in the beam. You can compensate the max M (from selfweight/loading) in the middle of the beam, but at the end of the beams you have unnecessary negative moments. The rebars for prestressing shou...

Here is a testcase you can run. 8-m 2-field beam, loading self-weight and constant 20 kN/m. The static calculation was done with my commercial software. 2_field_beam_static_calculation.pdf 2_Field_Beam.FCStd testcase.JPG Thanks Thomas, that's an interesting one to test. Let me see what my FC routin...

Load Case 4 - Self weight + Pre-tension + Live load In a final step the effect of applying live load is considered. The maximum deflection under this load is 7.7mm, which should be compared to the 10.6mm without pre-tension. The stress in the cable increase further to 388MPa.. The required reinforc...

Load Case 3 - Self weight + Pre-tension In this and the next case the effect of pre-tensioning of the beam will be analysed - in particular the impact on the reinforcement ratios and shear/crushing failure of the beam. In this Load Case 3 the situation before applying live load will be considered. ...

Load Case 2 - Self weight + Live load (no pre-tension) This second case represents a simply reinforced beam without pre-tension. The maximum deflection of the beam for this case is 10.6mm and the induced stress in the passive cables is 162 MPa … they act as reinforcement bars. The required reinforc...

I spent some time exploring the application of the Reinforcement Ratio and Mohr Coulomb routines for concrete design. For this I analysed the beam of previous posts, with and without pre-tension. The dimensions and properties of the beam are as follows: Beam Dimensions : 4.0x0.3x0.1m Elastic paramet...