How to model Shear Hinge for RC beam and Column?

[venkateshyadav]

Hi,
Am using forceBeamColumn for defining the RC fiber section.
Does this forceBeamColumn considers both moment hinges and shear hinges?
If it is not considering shear hinge, the how to model shear hinge?
Can you explain using some example?
Thanks in advance

[selimgunay]

It does not consider shear. You need to define the shear force displacement separately and use section aggregator to combine shear and flexure

http://opensees.berkeley.edu/wiki/index ... Aggregator

[venkateshyadav]

selimgunay wrote:
> It does not consider shear. You need to define the shear force displacement
> separately and use section aggregator to combine shear and flexure
>
> http://opensees.berkeley.edu/wiki/index ... Aggregator

Hi,
How to define shear force displacement separately? Can you provide some example?
In the examples provide in the Opensees wiki, there is no problem with this hear displacement relation ans section aggregator.
So can you please explain with some example?

[venkateshyadav]

selimgunay wrote:
> It does not consider shear. You need to define the shear force displacement
> separately and use section aggregator to combine shear and flexure
>
> http://opensees.berkeley.edu/wiki/index ... Aggregator
HI selimgunay,
I am forceBEamColumn element fiber section for defining RC section.
As we know that forceBeamColumn element doesn0t consider shear capacity.
I know the yield shear strength of a column. when I run pushover analysis, one the column reaches yield shear strength it should fail even if it has flexural capacity, I mean to say I have to provide kind of brittle failure with yield shear strength.
In SAP2000 it is possible, but how to do do in Opensees. How to define that yield shear strngth using which command?
After defining I know to aggregate the section using section aggegator.
Can you please help me with this

[selimgunay]

You need to define the force displacement relation in shear. Note that you need to do this using uniaxial material command. Then you need to combine your flexural fiber section with the shear force displacement using section aggregator.

[venkateshyadav]

selimgunay wrote:
> You need to define the force displacement relation in shear. Note that you
> need to do this using uniaxial material command. Then you need to combine
> your flexural fiber section with the shear force displacement using section
> aggregator.

I had used uniaxial steel01 material to define the shear force displacement relation. The main problem is in defining the strain hardening ratio. An when I used this material, my pushover curve is getting as a straight line where there is drop in the base shear value.
Can you help me in this issue?

[selimgunay]

Yoiu can use some other material (for example Hysteretic) to define the shear force-displacement with a negative slope after the yield.

[venkateshyadav]

selimgunay wrote:
> Yoiu can use some other material (for example Hysteretic) to define the
> shear force-displacement with a negative slope after the yield.

Hi,
I have the yield shear displacement values as ; shear=84KN and corresponding displacement as 0.5mm.
After reaching the yield shear value, the model should go into the shear failure zone even if it has the flexural capacity. am performing the pushover analysis. When I defined the same using hysteric material, my code is not running properly and the opensees.exe is closing by itslef.
How to model this and by using which material?
Can you please help me with this?