Horizontal thrust in rigid frames
Horizontal thrust in rigid frames
(OP)
We need thrust rods in a pre-eng rigid frame building ...span 60 ft unfactored thrust 40 kips.
Should I use Dywidag corrision protected or plain Dywidag concrete encased or Ordinary Grade 400 reinforcing bars (concrete encased)? Coated rebar is probably available but pricey. Hair pins are not the greatest idea in grade supported slab over plastic clay. Any thoughts welcome.
Should I use Dywidag corrision protected or plain Dywidag concrete encased or Ordinary Grade 400 reinforcing bars (concrete encased)? Coated rebar is probably available but pricey. Hair pins are not the greatest idea in grade supported slab over plastic clay. Any thoughts welcome.






RE: Horizontal thrust in rigid frames
RE: Horizontal thrust in rigid frames
RE: Horizontal thrust in rigid frames
Mike McCann
MMC Engineering
RE: Horizontal thrust in rigid frames
Agree that hairpins are not a good solution, but realize that they are a quick and dirty answer in PEMB. I don't like to depend on the slab for resistance to column thrust, because you don't want the slab to crack, and the slab may be interfered with at some stage.
Like Ron, I like post-tensioned slab on ground construction, but only if the tendons are bonded. Unbonded tendons give poor crack control, as the slab can slide relative to the tendons. But again, I don't want the slab to be restrained by the columns. A PT slab needs to be able to shorten due to shrinkage and applied PT.
The best, but perhaps most expensive approach is to design the footings to take the thrust. A two pile/pier arrangent usually works.
RE: Horizontal thrust in rigid frames
RE: Horizontal thrust in rigid frames