Combined footing quick question,
Combined footing quick question,
(OP)
Hi guys,
i was trying to design a combined footing, and i notice that the reaction that im getting due to seismic is positive in one column and negative in the other ( due to the direction of the siesmic, in reverse if the direction is changed). since they have a couple reaction due to siesmic sizing the footing is impossible i'll be getting trapezoidal in siesmic and if checked in static condition i'll be getting rectangular combined. i know that siesmic is instantaneous reaction and im thinking of using both the positive reaction from both the column irregardless of the direction. but i hope someone could in lighten me. i cant find a good sample dealing with siesmic combined footing.
thanks
i was trying to design a combined footing, and i notice that the reaction that im getting due to seismic is positive in one column and negative in the other ( due to the direction of the siesmic, in reverse if the direction is changed). since they have a couple reaction due to siesmic sizing the footing is impossible i'll be getting trapezoidal in siesmic and if checked in static condition i'll be getting rectangular combined. i know that siesmic is instantaneous reaction and im thinking of using both the positive reaction from both the column irregardless of the direction. but i hope someone could in lighten me. i cant find a good sample dealing with siesmic combined footing.
thanks





RE: Combined footing quick question,
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Combined footing quick question,
RE: Combined footing quick question,
If you post some sketches showing the load cases that you're considering and how you're proposing to handle them, I'd be happy to provide comment.
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Combined footing quick question,
RE: Combined footing quick question,
thanks alot from your inputs, i tried to design the size of the combined footing considering static case and applying the said size to dynamic causing a great amount of eccentricity causing it to failing in the allowable bearing capacity even considering 130% increase in the allowable. Non the less i think i don't have any choice but to satisfy both static and dynamic.
thanks again,