Strip foundation for very high containment barriers

[mamebraso]

In analysing strip foundation for high containment barriers. I visualise it as; when i place a long log on the floor it is easier to move it by pushing at one than to push it in the middle. So in my design i model the strip foundation as a line beam attached to the soil springs every metre (EC Hambly) in a sofwtare. I then make sure i produce a size so as to create a support reaction not greater than the frictional resistance of the foundation size. I then design for bending due to the moments i obtain. My confusion is another engineer says you could produce a smaller size foundation and prevent the slip by increasing the steel. To me if the log is still made stiffer it will move when pushed at one end. If it was deflection i will agree 100% but this is sliding. Since i am a structural engineer i am counting on the experience of soil engineers. Help out

 

[mamebraso]

Following to question. i will like to be a bit specific since i require the advice from you. will a 1.7m deep and 1.2 metre wide foundation of length 28metre (strip foundation) be able to withstand sliding when it is impacted with a force of 528.006kn shear force and a moment of 1246.3knm (have added the moment due to the shearforce). coefficent of friction is 0.404. When this impact is applied at the end of the strip not the middle and please will steel help. i am a bit skeptical on that

 

[fndn]

I ran a spreadsheet analysis on your numbers, and assuming phi of soils 1s 31 or higher, and applied vertical loadings are 150 kn/m or less, I obtained eccentricity outside the middle third. ( e = 0.297 m ) So width of 1.8 m will be your minimum to satisfy eccentricity. You may consider adding 1.25% reinforcemnet.