Concrete tie beam
Concrete tie beam
(OP)
A steel braced frame columns are supported on Spread Footing with tie beam between the columns. I have vertical and horizontal reaction from Frame. So designing tie beam i have to consider that has regular concrete beam with axial load (Horizontal reaction from column) ?






RE: Concrete tie beam
BA
RE: Concrete tie beam
RE: Concrete tie beam
BA
RE: Concrete tie beam
RE: Concrete tie beam
RE: Concrete tie beam
RE: Concrete tie beam
If you are carrying 100 kips with 8-#6 bars, your steel area is 3.52 in^2 and the stress is 28,300 psi. The total strain is E*L/28,300 where L is the length of the tie.
BA
RE: Concrete tie beam
RE: Concrete tie beam
RE: Concrete tie beam
BA
RE: Concrete tie beam
RE: Concrete tie beam
RE: Concrete tie beam
Well, how about it?
Is the tie beam a tension member, a compression member or both? Perhaps you should post a sketch of your structure so that we can get a better understanding of the problem.
BA
RE: Concrete tie beam
RE: Concrete tie beam
BA
RE: Concrete tie beam
RE: Concrete tie beam
RE: Concrete tie beam
RE: Concrete tie beam
RE: Concrete tie beam
hello12345hello
Normally if columns of the steel structure are braced i dont think you really need a Tie beam.Tie beam could be a compressive or tensile member it really depends.
if I were you and I would design a steel structure say 1 floor building and I wouldnt bother to provide tie beam however if my structure is multi story building i would provide Tie beam.
7thsky
RE: Concrete tie beam
Outside of a code requirement for the beam/strut, I would only provide the beam/strut if required to resist sliding.
RE: Concrete tie beam
RE: Concrete tie beam
RE: Concrete tie beam
RE: Concrete tie beam
BA
RE: Concrete tie beam
1. The tie beam will limit lateral movement in the footings due to any seismic activity or subgrade movement.
2. If the beam is extended to other adjacent footings, it can become a grade beam where it can pick up additional dead load if needed, to resist overturning from the braced frame.
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: Concrete tie beam
if i will consider combine effects of both footings and Min. Load combination, say i have uplift on one footing and downward load on the other footing so Addtional load on other footing will help me to provide sliding resistance. (Sliding coefficient * Vertical Reaction). + (Passive Pressure reaction Times two from both footing). Correct?
RE: Concrete tie beam
BA
RE: Concrete tie beam
The Canadian code CAN/CSA A23.3 requires mechanical or welded splices for tension tie members, and does not allow lap splices. The definition in the appendix leaves some leeway for interpretation, but I think this is pretty clearly something that would fall under that clause. I wouldn't be surprised if there's a similar clause in the ACI code, given that they generally have the same history.
RE: Concrete tie beam
RE: Concrete tie beam