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I wanted to know the difference between S13 and S23 and how to identify which i should use to output result of shear to model punching

Converting normal weight concrete to lightweight concrete, the reduction factor for reducing the normal weight concrete to lightweight concrete is that multiplying which numbers by 0.75

the reduction factor stated in ACI is 0.75 fc'^0.5 it is not clear for me if I want to change the compressive strength of normal weight concrete to light weight concrete shall i multiply it by 0.75

i am modeling a lightweight concrete flat slab but the mixture of concrete contains fibers in it how can i model it in Abaqus

How to change the units for the graphs in Abaqus

I am modeling a lightweight flat slab to check punching. But the after analysis the results seems not reasonable. I attached the file since i can not find the errorhttps://files.engineering.com/getfile.aspx?folder=84f59090-844b-4319-9377-cb1709c4fe29&file=Light3_fforoo2del13.cae

I am modelin a flat slab model is it okay for that or there might be an error

RUN time in Abaqus less than 1minutes it that ok or there might be a mistake

I tried several times but it is not working, I did not recognize the error yet

A boundary condition has been specified on node set assembly_set-4 but this node set is not active in the model