RAM Foundation: Uplift of Complete Footing

RE: RAM Foundation: Uplift of Complete Footing

Abdisa Musa — Tue, 27 Jul 2021 05:53:03 GMT

Follow-up question. If I uncheck include self-weight in checking soil stress, does the program still consider the self-weight for the uplift check?

I want to exclude self-weight in the bearing check and include the self-weight in the uplift check. Is this possible? thanks.

RE: RAM Foundation: Uplift of Complete Footing

Abdisa Musa — Thu, 08 Jul 2021 17:20:43 GMT

Thank you Seth.

RE: RAM Foundation: Uplift of Complete Footing

Seth Guthrie — Thu, 08 Jul 2021 17:04:46 GMT

Check this: https://communities.bentley.com/other/old_site_member_blogs/bentley_employees/b/josh_taylors_blog/posts/spread-footing-overturning-and-uplift-checks-in-ram-foundation

The user can specify an uplift safety factor, but for spread footing overturning we are using 1.0. We can't evaluate something with a FS < 1.

RE: RAM Foundation: Uplift of Complete Footing

Abdisa Musa — Thu, 08 Jul 2021 15:09:45 GMT

Hi Karl,

I am researching overturning FS in RAM Foundation in this forum. Does the design error "Excessive Moment in Minor or Major Direction" result with a factor of safety FS less than 1 or 1.5? I see you noted 1.5 above.

In addition, I have the following questions.

1. Is that 1.0 the default FS against overturning RAM Foundation?

2. is there a way to allow FS against overturning less than 1.0 in RAM Foundation?

Thanks,

RE: RAM Foundation: Uplift of Complete Footing

Karl G — Fri, 02 Apr 2021 21:11:38 GMT

The "Uplift on Complete Footing" error is associated with a concrete load combination and is produced because the option marked in the image below is checked.

Even if that option is unchecked, Service Load Combination #320 would have an Overturning SF of 1.3 in the minor direction and would produce a "Excessive Moment in Positive Minor Direction" error since it is less than 1.5.

RE: RAM Foundation: Uplift of Complete Footing

Alex Bragg — Fri, 02 Apr 2021 19:26:15 GMT

The issue was still present after removing all other service load combinations. I have uploaded the file to the Secure File Upload, it is named CCC - Little Rock

RE: RAM Foundation: Uplift of Complete Footing

Karl G — Fri, 02 Apr 2021 18:25:12 GMT

The error message may be associated with a load combination other than #320, which is governing the uplift and overturning checks. To test, uncheck all service load combinations besides #320 and see if the report outputs the same error.

If questions remain, please share your model using our Secure File Upload and post the file name here after it is uploaded.