Combined Footing Design
Combined Footing Design
(OP)
I designed combined footing with the used of Staad Foundation V8i ver 5.3. The size of the footing is 9.7 by 0.9 meter, depth is 0.45meter, I have to limit the width and the depth, because the footings were exposed. Having a larger width, the wheel of the SPMT will clash on the footing. The result Staad Foundations give the size of the footing, the size and spacing of Rebars. But when I checked for the calculation, there is a computation which confused me, on one way shear, the Vu is greater than phiVc but the staad said that result is OK. Thus Staad Reinforced this one way shear with Rebars??
Also I just wanna asked if i can used the formula for Vc=2*sqtrf'c*bw*d for checking for one way shear, if I designed the combined footing with the columns not on the center of the width, I will adjust the 0.9 meter to 1.2 meter, 0.3meter will be added on one side of the footing only.
Also I just wanna asked if i can used the formula for Vc=2*sqtrf'c*bw*d for checking for one way shear, if I designed the combined footing with the columns not on the center of the width, I will adjust the 0.9 meter to 1.2 meter, 0.3meter will be added on one side of the footing only.






RE: Combined Footing Design
Offsetting the footing will increase the soil pressure on one edge. It will also result in greater one way shear stress near the same edge.
You don't provide enough information to permit anyone to answer your question. Maybe a sketch would help.
BA
RE: Combined Footing Design
column would not be on center of 1200mm wide.
SPMT Self Propelled Modular Transporter.
Can one way shear be reinforced?
RE: Combined Footing Design
RE: Combined Footing Design
One way shear can be reinforced. In a 450mm deep member, it would be usual to reinforce with stirrups. With eccentricity of loading, the shear stress will be varying linearly across the footing.
BA
RE: Combined Footing Design
on the other hand, if i will adjust the width to 1200 for example, the center of the column will remain 450 from one edge and 750 from the other edge.
RE: Combined Footing Design
RE: Combined Footing Design
RE: Combined Footing Design
we dont have a mentor yet, and this is the first time we encounter this problem, so I decided to ask a help on this forum.
your comments were very much appreciated.
RE: Combined Footing Design