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I am designing a concrete deck with landscaping on top. As the grade of the landscaping varies, my top of slab elevation needs to vary with it. I either have the option of sloping the deck or I can step the deck at the column lines. The landscape architect wants a stepped deck as it works out...

Thanks everyone for the responses. Regarding the direct analysis method, can you analyse it in RAM Elements?

I am analyzing an existing warehouse with columns that are 30' high to the roof. Problem is the columns are made up of 3 different sections. The first 10' of the columns are W8, the second 10' are HSS 8x8 and the last 10' are W8 again. What would be the un-braced length for each 10' section if...

So, what are the implications of having a higher precompression other than economic issues?

ACI 318 18.12.4 sets the lower limit of precompression force in a post tensioned slab at 125 psi, but I don't see any mention of the upper limit anywhere in the code. I read somewhere that the recommended maximum precompression force is 300 psi for slabs. Does anyone know if this is true and...