The algorithm used by the program to solve the stresses is non-linear, since it must cover the cases where there is cracking or non-linear stress-strain diagrams (parabolic sections):
The resolution method used by the program consists of iterating the deformation planes until it obtains one that balances the external forces (N,M).
The rough process would be as follows:
1- I test a plane of deformation.
2- I enter the stress-strain diagram of the material and get the stresses in each fiber.
3- I integrate the stress blocks and obtain the resultant stresses (N,M).
4- I compare the resultant stresses with the applied stresses until the difference is practically zero.
If in the analysis parameters for SLS a right-angled parabola diagram like the following is considered:
In this diagram, according to EC2, the calculation of stresses is independent of the modulus of elasticity, so the same results are obtained, since the plane of deformation that balances the external forces would be the same in this case:
On the other hand, if we select another diagram of material behavior, where the modulus of elasticity is used to calculate the stresses, we will see that the results will be different:
E=18 kN/mm2
E=35 kN/mm2
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