Braced Frame foundation
Braced Frame foundation
(OP)
I want to design the spread footing for steel diagonal braced frame. I just read this one thread on eng-tips about footing design.
http://www .eng-tips. com/viewth read.cfm?q id=228071& amp;page=5
thread486-228071: Braced Frame Footing Design - Lateral Seismic Load??
I have braced frame footing with lateral load of 67 kip. I am tying both footings together. so there will be axial load in beam. As i have grade beam running between the footing so that there will be uplift on one footing and downward load on other footing. TO check against overturning, i will make sure my footing weight is good enough for uplift. To check against sliding i will use passive pressure and sliding coefficient times vertical downward load on the opposite footing.
Now do i have to check that as isolated footing and consider moment at base of the footing M = Horizontal load*depth of footing. To check footing soil pressure do i have to consider this moment from horizontal lateral load.
q = P/A +- M/S.
or just q = P/A.
Thank you
http://www
thread486-228071: Braced Frame Footing Design - Lateral Seismic Load??
I have braced frame footing with lateral load of 67 kip. I am tying both footings together. so there will be axial load in beam. As i have grade beam running between the footing so that there will be uplift on one footing and downward load on other footing. TO check against overturning, i will make sure my footing weight is good enough for uplift. To check against sliding i will use passive pressure and sliding coefficient times vertical downward load on the opposite footing.
Now do i have to check that as isolated footing and consider moment at base of the footing M = Horizontal load*depth of footing. To check footing soil pressure do i have to consider this moment from horizontal lateral load.
q = P/A +- M/S.
or just q = P/A.
Thank you






RE: Braced Frame foundation
I think many wouldn't count both friction and passive push to equilibrate the horizontal loads, but it may be warranted since friction will mobilize passive push from deeper layers than just the front of the lead footing.
RE: Braced Frame foundation
RE: Braced Frame foundation
RE: Braced Frame foundation
All the process to be done with the factors mandated by the codes that distinguish their favourable or unfavourable behaviour.