Bonded Post Tensioning / Parking Garage
Bonded Post Tensioning / Parking Garage
(OP)
I have a parking garage with 60' x 20' bays. The owner would like to design for blast loading. Unbonded PT is no good for blast and mild steel is questionable for the 60' span.
I believe bonded post tensionsing is the answer however I can't find any design information. PTI does not publish a method for design. I've never done this type of design before so I am looking for a step by step method to design beams and slabs with bonded post tensioning. Can someone point me in the right direction?
My beam depth is limited to 40", my slab will be 6". Does anyone have an opinion about using a conventional reinforced concrete beam for a 60' span?
Thank you
BVBUF





RE: Bonded Post Tensioning / Parking Garage
In practice, the maximum live loading will be less than 15 psf. If the heaviest vans/trucks are used to determine the loading, this will bump up to 20 to 25 psf. I've used this to 'help determine' the degree of fixity considered between the beams and columns.
RE: Bonded Post Tensioning / Parking Garage
Also a significant savings in rebar by using the actual bar cut-off locations for both top and bottom bars. Top bars get staggered over the support and bottom bars are approximately 1.6 times the span and half the required area. They are continuous through the support with the adjacent span making up for the other half of the area required.
RE: Bonded Post Tensioning / Parking Garage
VSL have a very good 2 strand system for slabs
RE: Bonded Post Tensioning / Parking Garage
Thanks dik for the ideas using conventional steel. Looks like that is the way I'll go.
RE: Bonded Post Tensioning / Parking Garage