IngeIvan
Structural
- Nov 29, 2014
- 26
Hello,
I am relatively new using RAM concept and to PT design in general and I have a basic question.
I'm designing a two-way PT flat slab that's restrained on all four sides by walls. My understanding is that per code, these slabs are to remain Uncracked and all service stresses shall be kept below 6sqrt(f'c). We go through the whole gravity design under this assumption. Then when we get to Load History Analysis to calculate deflections we start talking about shrinkage restraint % and how this affects the effective moment of inertia, where up to a 30% shrinkage restraint would cause all your elements on the floor to crack and significantly increase your deflections. My question is, if this were to happen, wouldn't that invalidate the service design that we did in the first step?
Thanks.
I am relatively new using RAM concept and to PT design in general and I have a basic question.
I'm designing a two-way PT flat slab that's restrained on all four sides by walls. My understanding is that per code, these slabs are to remain Uncracked and all service stresses shall be kept below 6sqrt(f'c). We go through the whole gravity design under this assumption. Then when we get to Load History Analysis to calculate deflections we start talking about shrinkage restraint % and how this affects the effective moment of inertia, where up to a 30% shrinkage restraint would cause all your elements on the floor to crack and significantly increase your deflections. My question is, if this were to happen, wouldn't that invalidate the service design that we did in the first step?
Thanks.
