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RC Column verification: Design combination EC8

4 REPLIES 4
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Message 1 of 5
stroxy
563 Views, 4 Replies

RC Column verification: Design combination EC8

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?

4 REPLIES 4
Message 2 of 5
stroxy
in reply to: stroxy

Any clarifications please?

Message 3 of 5
Rafal.Gaweda
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
Message 4 of 5
stroxy
in reply to: Rafal.Gaweda

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.

Message 5 of 5
Rafal.Gaweda
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.

 

2_3.jpg



Rafal Gaweda

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