SAP 2000_Link with different stiffness for tension and compression 1

[josie007]

Hello everyone,

I am trying to model a link in SAP 2000 (nonlinear analysis), but I need the links to have different stiffness values in compression and tension.
Is this possible in SAP2000? I would appreciate your help very much.

Regards
Josie

 

[PicoStruc]

You might use a gap and a hook with their respective stifness.

 

[josie007]

Thank you very much for reply. I will give it a try.

 

[stressed]

PicoStruc's approach is valid, but it gives you two separate output link items to review. An easier modeling approach would be to Define a multi-linear plastic link that has different Force-Deformation curve values in each direction

 

[johnbridge231]

I agree with PicoStruc, that is the most convenient way to do this.

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

 

[stressed]

Use the multi-linear plastic link.

 

[johnbridge231]

josie007, as you can see there are many alternatives, but the easier is to use gap/hook elements. However, you can use multi-linear plastic link (this is generally not recommended but may be useful to you).

Regards.

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

 

[stressed]

johnbridge, please enlighten us as to the technical justification as to why the multi-linear plastic link is "not recommended", when gap and hook modeling approaches forces the user to define TWO links instead of one and sort through two links in the output instead of one? Whereas multilinear plastic link is just one link (easier) to deal with.

 

[johnbridge231]

josie007, use gap and hook elements as PicoStruc also suggest.

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

 

[PicoStruc]

Both method works without problem,

The hook/gap method work with basic/plus license while, the non-linear link require Advance license ($$$).