Hysteretic Material

[sedatacem]

Dear All,

For my post tension beam column connection I use Hysteretic uniaxial material.

$damage1 damage due to ductility: D1(mu-1) so D1 = mu -1 ? .

I have the value for mu to power of -beta, but the command asks for beta only. therefore i need to find mu ...

Thanks,

Sedat Acemoglu

[mhscott]

mu is the ductility, strain / yield_strain, calculated in the material, so not an input

[sedatacem]

the problem is my post tension connection return path goes thru 0,0. My aim is to make mu-beta *Ko such that return path goes thru 0,0. To do this, I equate mu-beta*Ko= s3p/e3p, to make return path go back to 0,0, I need to input damage1 and beta as input...However, I dont know how to calculate damage1 and beta to make sure that return path goes thru 0,0.

I hope i could make it clear.

[sedatacem]

I sent an email showing a picture that may help to understand the problem.

[mhscott]

Hmm, I don't think you can make the return path go through 0,0 with HystereticMaterial. There are two materials called OriginCentered and SelfCenteringMaterial that might do what you want, but I have never tried them.

[sedatacem]

Thanks Professor, I will check them.

[sedatacem]

Well, I checked them both, however, they do not allow to specify negative values. Only positive K and it uses in negative zone as well..Hysteretic allows to input different positive and negative values...

[selimgunay]

You can try combining the self-centering and Hysteretic (or any other) using a Parallel material to get different values in positive and negative directions.

https://opensees.berkeley.edu/wiki/inde ... l_Material

[hesamgholamigmail]

Salutes all minds
I want to know that how do model [gap] in Hysteretic material for fixed bearing and expansion bearing elements in the bridge (Neilson 2005).
Can I model a gap in hysteretic material or should use other ways?
*I have being trying that by combininga HystereticMaterial with an EPPGapMaterial in a SeriesMaterial*
Thanks a lot.

[selimgunay]

Yes that should theoretically work, you need to check the resulting force displacement though

[hesamgholamigmail]

Yes that should theoretically work, you need to check the resulting force displacement though

Hello to you
Unfortunately, I can not catch a good response because there are two gaps (negative and positive) in combination.
Actually, how I model this material , besides I have to that combine two EPPGapMaterials with HystereticMaterial in SeriesMaterial !!!!
HELP ME

[hesamgholamigmail]

Salutes to you
How do I use the best possible mode from hysteretic material during performing time history analysis in the bridge model (i.e stability test described in workshop's ‪Frank McKenna)?
Crated instability (dt=0.005, dt= 0.00001) in owing to it.

[hesamgholamigmail]

Yes that should theoretically work, you need to check the resulting force displacement though

Hello, when I used this way for considering fixed and expansion bearing, many of hysteretic materials about 196 utilized on case of bridge in which created instability of structure. what do I do? do instability produce by using exceesive of HysterticMaterial?