Gravity Support of PT Concrete Slab @ Shaft
Gravity Support of PT Concrete Slab @ Shaft
(OP)
I'm working on a post tensioned concrete building with concrete shaft shear walls. The column spacing is pretty regular throughout.
At two locations, however, there are concrete stair/elevator shafts that essentially take the place of columns (i.e. there is a shaft wall where a column would have landed in the absence of the shaft).
Based on my judgment and the advice of my peers, I intend to treat the shaft wall as gravity support for the adjascent slab. Essentially it will be a big, funny shaped column for gravity purposes.
I have the following questions regarding this arrangement:
1) Does it seem reasonable to use the shaft walls in this way?
2) For modelling purposes, should I assume that the column is located at the centroid of the shaft wall section? This is complicated somewhat by the fact that my shear walls are C & L shaped sections.
3) Are there any special detailing concerns that I should be aware of?
Thanks,
Adam
At two locations, however, there are concrete stair/elevator shafts that essentially take the place of columns (i.e. there is a shaft wall where a column would have landed in the absence of the shaft).
Based on my judgment and the advice of my peers, I intend to treat the shaft wall as gravity support for the adjascent slab. Essentially it will be a big, funny shaped column for gravity purposes.
I have the following questions regarding this arrangement:
1) Does it seem reasonable to use the shaft walls in this way?
2) For modelling purposes, should I assume that the column is located at the centroid of the shaft wall section? This is complicated somewhat by the fact that my shear walls are C & L shaped sections.
3) Are there any special detailing concerns that I should be aware of?
Thanks,
Adam






RE: Gravity Support of PT Concrete Slab @ Shaft
RE: Gravity Support of PT Concrete Slab @ Shaft
What kind of software are you using to calculate your post-tensioned members?
Only beams and columns are posttensioned, correct?
Do you have a good reference for the design of post-tensioned buildings?
And, finally, do you think construction cost is much cheaper than regular reinforced concrete or even steel?