huangyhg

pt unbonded tendon placing and layout in 2 way slabs-long
i am interested in everyone's opinion on tendon placing options within the banded-distributed layout. most literature supports a standard scheme of placing distributed tendons+top rebar within the effective width first, followed by all banded tendons+top rebar, finished up with all remaining distributed tendons. would it not be easier to just place all banded tendons+top bars and then all distributed tendons+top bars? i realize this would result in less drape for the banded tendons. i have found that most designs require top bars to extend more than ln/6-so doesn't this reduce drape in the uniform tendons in the standard scheme or do the uniform tendons placed after the banded tendons push the top bars in the banded direction down in a concave shape to maintain a larger drape since they are placed after the banded tendons+top bars?
my second question is in regards to bottom bars. i have seen recommendations for placing them uniform in the unifom tendon direction and banded in the banded tendon direction but that would leave large areas of slab without reinforcement in two directions which could be problematic for temp reinf. in the banded tendon direction, non-rectangular slabs, point loads, and other misc detailing problems. do people use uniform layouts of bottom bars in each direction (albeit at a large spacing relative to a conventional slab)? and if so, do you reduce the drape accordingly since you can't get tendons through the bottom mat since it would be placed before any tendons?
basically, how varied can your layout be relative to the standard information printed in pt design literature while still mainting the basic prinicples of banded-distributed to reduce tendon weaving to a minimum. thanks in advance.
greg

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