Fully fixed 3D frame + Time history load (El Centro) =0.006m Absolute displacement at ground joint??

[Mohrtec]

I am not getting 0 as my absolute displacement for joint 1 in my simple 1-storey 3D frame structure when I apply an earthquake load, rather I am getting 60mm in the U1 direction (the rest are 0).
The frame is fully restrained.

I am new to SAP2000, can somebody please explain what I am doing wrong? Is it wrong?

 

[Mohrtec]

^^ I should say, the problem of not getting 0 applies to all 4 of the base joints and not just joint 1.

 

[johnbridge231]

Did you apply horizontal restraints (TX,TY) to all base joints?

Analysis and Design of arbitrary cross sections
Reinforcement design to all major codes
Moment Curvature analysis

http://www.engissol.com/cross-section-analysis-design.html

 

[Mohrtec]

Johnbridge231, thanks for the response. Yes the structure is fully restrained, although I'll mention the way it was restrained (via Define->Joint restraints) in case there is some other way I don't know about (I'm still quite new to the programme).

Thanks

 

[johnbridge231]

THis sounds weird. Can you upload a link to your model?

Analysis and Design of arbitrary cross sections
Reinforcement design to all major codes
Moment Curvature analysis

http://www.engissol.com/cross-section-analysis-design.html

 

[Mohrtec]

Thanks for your reply. I have uploaded the file to 2shared:

http://www.2shared.com/file/oWdQpSAd/1_STORY_FIXED__PRE_PLAY_.html

The relative displacements, deemed just "Displacements" in the table look fine, its just the absolute displacements which is a cause for concern.

thanks again

 

[stressed]

The 2shared site requires additional software to download. Why not upload using eng-tips tools?