choosing the correct structural system for 15m span slab

[Hilal12]

Hello,

I am working on the structure of a large 3 story building that contains 15.5mx8m (columns to columns) slabs, the slab is supposed to be 25cm thick with no drops which till now I have not found any possible system or solution to make it feasible and propose for design (I am a newly graduated civil engineer).
through research and preliminary study I saw that what can be done:

- Making the 8m edges as main steel section beams (slimflor) with 40-45cm hollow core precast slabs connecting inside the beams and spanning the 15m. would result in total thickness of 50 to 60cm > 25cm.

- Using post tension that would results in 30~35cm thickness.

I have not studied either systems before, is what I am saying reasonable? is there any structural system for reaching the 25cm thickness goal?

also I am new to these forums so sorry if this was not the right place to post this question, thank you.

 

[Lomarandil]

L/d of 60? Yeah, that's not happening for standard reinforcing**. Certainly not for deflection.

** I'm no expert on posttensioned slabs, so it's possible you could make something work with the right loading conditions and camber, maybe. But still seems far-fetched to me.

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just call me Lo.

 

[MIStructE_IRE]

PT Generally works out around L/d = 40ish. 250mm over 15m is not going to happen with any material unless you’re building on the moon..