Seismic analysis EC8

RE: Seismic analysis EC8

Modestas — Fri, 17 Jan 2020 10:45:24 GMT

The responses obtained from the Response Spectrum analysis are absolute unsigned quantities. If you want to see signed bending moment diagrams, you can use either Dominant or Signed option in the Response Spectrum Load Case settings. You can find some more useful information on this topic here: https://communities.bentley.com/products/ram-staad/f/ram-staad-forum/123938/signed-response-spectrum/376619#376619

M P — Fri, 17 Jan 2020 10:25:37 GMT

For response spectrum in X+ and X- direction, the Mx diagrams are the same.

Even in Y direction I have the same condition.

Modestas — Fri, 17 Jan 2020 10:05:19 GMT

Your reference load definition should look like that:

LOAD R1 LOADTYPE Mass TITLE mass

SELFWEIGHT X 1 LIST ALL

SELFWEIGHT Y 1 LIST ALL

SELFWEIGHT Z 1 LIST ALL

MEMBER LOAD

13 TO 18 UNI GY 3

13 TO 18 UNI GY 1

13 TO 18 UNI GX 3

13 TO 18 UNI GZ 3

13 TO 18 UNI GX 1

13 TO 18 UNI GZ 1

END DEFINE REFERENCE LOADS

If that still does not help, please illustrate your issue with a screenshot.

M P — Fri, 17 Jan 2020 09:59:06 GMT

In the postprocessing mode, the Mz diagrams , for the seismic combinations, are not changing.

Modestas — Fri, 17 Jan 2020 09:25:21 GMT

And the results are still not as expected? In that case please attach the model and let us know what results differ from your expectations.

M P — Fri, 17 Jan 2020 08:49:44 GMT

Yes I made the masses from the reference loads definitions.

Modestas — Fri, 17 Jan 2020 08:42:23 GMT

You should create a reference load with a Mass type selected and provide the masses in all 3 global directions.