I am looking for a model which consider crack spacing of reinforced concrete beams as one of the obtained results by that model.
Crack spacing measurement is directly not possible in FEA. Whether cracking stress value is exeeded is recorded at integration points. So the number of points where cracks are formed can be determined. From there, it is possible to have a gross idea of crack locations. but how the cracks moves along these cracked points physically may not be determined easily.
Well. considering the cracking strain or cracking stress with the corresponding limiting value you can always find out the integration points which has cracked. Then determining the absolute coordinates of these points one can find the spacing of cracks indirectly. But then think that you make finer mesh of the same beam and again determine the cracked integration points and then calculate the crack spacing as described above. You will arrive at a closer crack spacing this time. Revise the mesh further you get more closer crack spacing. Will that be helpful?
In fact all the numerically cracked points will not be real cracks that you may see in the real beam. Measuring the principal tension one can reasonably assess the direction of cracks that will develop but the exact spacing will remain inexact.
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