Hi!
In STAAD Pro v8i, how are you going to model a runway footing on top of suspended slab(roof slab) and analyze & design the runway footing considering the strength of existing suspended slab?
Thank you!
Answer Verified By: Master Mac
Hi Sye,
Thank you for that very informative explanation/advice and also for spending time reading and answering my question. Appreciated much.
Initially what i did is as per below:
1) I modeled the suspended slab as mesh of plates supported by FIXED SUPPORTS at the perimeter only and defined the thickness which is 3.0M THK concrete (Compressive Strength = 30Mpa).
2) I then modeled the runway slab foundation as a BEAM at the middle of the mesh of plates (suspended slab) and make used of OFFSET to put it on top of the sus. slab. My runway slab now was a beam with defined properties of 1000m W x 400m THK sitting on middle top of the suspended slab.
3) Finally, i applied my computed loads (Vertical, Longitudinal & Transverse Wheel Load) and PERFORM ANALYSIS. I take the MAX Values of Mz. My, Mx and Vy and execute manual calculation for the beam rebars assuming simply supported.
Now, here is my follow up questions:
1) Is my appproach correct or can be considered?
2) I will also do what you advised to me as above but how can i define the spring value of the suspended slab with Compression Strength of 30Mpa and Thickness of 3.0M? How to design footing of mesh plate model in STAAD?
3) I want to use STAAD to design my beam and obtain the required steel area on top and bottom as well as the shear & torsion requirements. Is that ok?
4) Since i will be putting my runway foundation on top of suspended slab, shear connectors between these two structure is required, How can i determine the required steel to resist shear force between runway foundation and suspended slab?
5) Lastly, how am i going to check the deflection for both runway foundation and the existing suspended slab?
Thank you in advance attached image below is my initial model as explain above.
Regards,
Master mac