Hi,
According to EN 1998-1:2004 4.3.3.1 (11), the seismic excitation must be applied to all relevant directions.
For some structures there might be more than 2 relevant directions, and these directions may deviate from the directions of the global X- and Y-direction in the Robot model.
In my understanding of Robot, this should be possible when using the button "direction definition" in the "EN 1998 Parameters" dialog box.
I have tried this to a simple model, but it does not seem to work properly.
Have anyone tried something similar, with good results?
Hi,
you must use Quadratic or Newmark combinations:
Also, you can read p.15.8 from Mr. Wilson book
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Roman Zhelezniak
Robot Evangelist & Passionate Civil Structural Engineer
Keep in mind that unlike Newmark combination rule, SRSS rule is not direction dependant.
Rotating the building + newmark rule i guess will do the job.
Hi,....
....just to clarify,.... According to EC8 all the structure's members should "resist" 100% of the prescribed seismic forces in one direction plus 30% of the prescribed forces in the perpendicular direction!
i.e.:
1Edx"+"0,3Edy
0,3Edx"+1Edy
when Z direction is disregarded.
So, what I need to check in the "Direction definition" is......
Am I wrong?
Regards