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## Autodesk Robot Structural Analysis

Mentor
Posts: 167
Registered: ‎12-06-2011

# RC Column verification: Design combination EC8

240 Views, 4 Replies
09-19-2012 05:22 AM

1.00SPE_NEW14 (A)( SEIS. Joint X + )

How does one interprete the term of the design combination above, used in RC Column design with seismic dispositions under EC8, particularly the (SEIS. Joint X+) portion?

Mentor
Posts: 167
Registered: ‎12-06-2011

# Re: RC Column verification: Design combination EC8

09-21-2012 09:22 AM in reply to: stroxy

Product Support
Posts: 2,734
Registered: ‎04-26-2010

# Re: RC Column verification: Design combination EC8

09-24-2012 02:42 AM in reply to: stroxy

1.00SPE_NEW14 (A)( SEIS. Joint X + )

It means:

from combination   1.00SPE_NEW14

on level  (A) - top of column

It is a set of additional forces generated by the analysis of the joint (capacity in beams connected to this node=joint required for the seismic capacity calculations of columns with respect tothe capacity of columns (currently calculated and the top if one exists) - I hope you can understand :-) SEIS. Joint

in direction  X

Capacity calculated for positive moment +

Rafal Gaweda
Product Support
Autodesk, Inc.
Mentor
Posts: 167
Registered: ‎12-06-2011

# Re: RC Column verification: Design combination EC8

Thx Rafal

Can ( SEIS. Joint X + ) be de-activated even with seismic dispositions checked? It seems to cause very high moments in the column. I know it is a requirement of some codes, but would like to be able to see what is required from purely design considerations vis-a-vis capacity design considerations.

Product Support
Posts: 2,734
Registered: ‎04-26-2010

# Re: RC Column verification: Design combination EC8

09-24-2012 04:53 AM in reply to: stroxy

The only way is to calculate the column before calculations of beams adjoining to the node above the column. There will be no results from beams so a warning will appear as on jpg below (No. 2 and 3). The rest of seismic analysis should be done.

Rafal Gaweda
Product Support
Autodesk, Inc.