Hi, when i try to model pt flat slab and using different concrete grade (40 for pt slab and 30 for column, wall and conventional beam) there shows an error inconsistent concrete. Is RAM concept cannot model in different concrete grade?
You can use different grades of concrete. For some design codes, some code sections are limited to a single f'c for a single cross section. Check the program manual for more specifics on this.
For example, section 61.6.6 Section 11.2 Shear Resistance of Beams (Non Prestressed) says:
"For sections with multiple values of f ’c, the minimum f ’c is used."
But section 61.6.2 Section 10.2 Factored Moment Resistance (Non prestressed) says:
"For sections with multiple values of f ’c , the f ’c of each concrete block is used appropriately"
And section 61.6.17 Section 18.8.2 Cracking Moment says:
"Modulus of rupture (fcr) is 7.5 f ′c times the lightweight concrete factor. The maximum f ’c for the cross section is used."
Seth Guthrie I have the same issue and per your response it is ok to use different grades of concrete, then would it be advisable to ignore the Error "Mesher: inconsistent concrete" ?
It's OK to use different grades of concrete in the same Concept model. There are some situations like those noted above where the program will use the weaker of the two when employed in the same cross section. Check the program manual for details on that.
I had mistakenly had a priority 2 slab at a different concrete strength that was generating the error. I currently have diff concrete strengths for my supporting elements and the error is gone.