Modelling MomentRotation for a member
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Modelling MomentRotation for a member
Dear all,
If I want to model collapse of a building by using momentrotation relationship for each member, do I must set the hinge length equal to zero? or any other requirement for this type of member's modelling? I am a bit confuse since the manual explained that the ductility of member that considered in member input data is based on momentcurvature relationship.
I thank you in advance.
Best regards,
adekajeng
If I want to model collapse of a building by using momentrotation relationship for each member, do I must set the hinge length equal to zero? or any other requirement for this type of member's modelling? I am a bit confuse since the manual explained that the ductility of member that considered in member input data is based on momentcurvature relationship.
I thank you in advance.
Best regards,
adekajeng
AdekAjeng Posts : 39
Join date : 20100224
Re: Modelling MomentRotation for a member
I've forgot to mention that I am using one component Giberson and concrete beamcolumn members.
AdekAjeng Posts : 39
Join date : 20100224
momentrotation
If the hinge length is 0.0, the program takes it as 1.o then the plastic rotation is identical to the plastic curvature. However, the elastic curvature is not equal to the elastic rotation so ductility will be difficult to comprehend. The plastic hinge length is usually taken as of the order of half the beam depth up to the beam depth. I suggest talking to someone who designs RC beams or who understands the behaviour of RC beams taken beyond the elastic limit.
Athol Carr Posts : 115
Join date : 20091209
Location : Christchurch, New Zealand
momentrotation using SPRING element
I am really grateful and appreciated. Thank you Prof. Carr.
It is meant that if i want to address the momentrotation in hinge, I must use the zerolength element (SPRING). Am I correct?
if yes, do you have any example of the use of SPRING element for a member with momentrotation definition in its hinge properties?
SPRING element is able to model strength and stiffness degradation as Giberson's member right?
FYI, we deal with generic (theoretical) models that reflecting RC structure strictly based on its momentrotation hysteresis parameters. the hinge refer to momentrotation relationship only (excluding the momentaxial interaction). We already defined the hysteresis parameters based on the recent RC evaluation method (we called it as BerkeleyStanford method). Unfortunately, we are not sure how to model it with RUAUMOKO. I wish you could help us.
Thank you in advance.
It is meant that if i want to address the momentrotation in hinge, I must use the zerolength element (SPRING). Am I correct?
if yes, do you have any example of the use of SPRING element for a member with momentrotation definition in its hinge properties?
SPRING element is able to model strength and stiffness degradation as Giberson's member right?
FYI, we deal with generic (theoretical) models that reflecting RC structure strictly based on its momentrotation hysteresis parameters. the hinge refer to momentrotation relationship only (excluding the momentaxial interaction). We already defined the hysteresis parameters based on the recent RC evaluation method (we called it as BerkeleyStanford method). Unfortunately, we are not sure how to model it with RUAUMOKO. I wish you could help us.
Thank you in advance.
AdekAjeng Posts : 39
Join date : 20100224
Momentrotation
The Spring member is one way of achieving what you want as it uses momentrotation as the governing behaviour. The SPRING members model things in a way similar to the Giberson member except that it does not have a hinge length to convert rotation into curvature. The hysteresis rules and strength degradation work in the same way as for the Giberson beam. I have examples somewhere but will take time to find them and I am going away for 3 weeks. Make the hinge member a short length as then it can define the orientation of the member though this is not such a problem in 2D in 3D the program choice of axes in 3D for zerolength members has caughtout a few users.
Athol Carr Posts : 115
Join date : 20091209
Location : Christchurch, New Zealand
Re: Modelling MomentRotation for a member
Thank you very much Prof. Carr. Just want to make sure: you meant use short length for hinge member instead of zerolength to avoid any error, right ? my model is 3D.
If you dont mind, I would like to request the following case examples after you back:
 spring element for hinge member governing by momentrotation
 spring elements as a model of beamcolumn joint. This one will be very useful for modelling an experimental testing of beamcolumn subassemblage.
Again, thanks a lot for your answers. it is really..really..helpful.
If you dont mind, I would like to request the following case examples after you back:
 spring element for hinge member governing by momentrotation
 spring elements as a model of beamcolumn joint. This one will be very useful for modelling an experimental testing of beamcolumn subassemblage.
Again, thanks a lot for your answers. it is really..really..helpful.
AdekAjeng Posts : 39
Join date : 20100224
momentrotation
The program uses momentcurvature as then ductility is easy to compute, the elastic yiled curvature is the yield moment divided by EI, the maximum curvature found during the analysis gives the ductility. If the plastic hinge length is 1.0 (also obtained by specifying 0.0) then the curvature in the hinge is the same as the pl;astic rotation in the hinge. The ductility is now a bit more difficult as the rotation at a member end is also a function of the moment at the other end of the member as well. It depends on what you are trying to model but the behaviour of the hinge at an end of the member is a function of the moment at that end of the member. The program (pre 1980) worked with momentrotation but with the difficulties of understanding ductility and momentcurvature we switched to using momentcurvature as that is what the crosssection understands.
Athol Carr Posts : 115
Join date : 20091209
Location : Christchurch, New Zealand
Re: Modelling MomentRotation for a member
Hi Adek,
because the conversation moved away from momentrotation modeling, but it changed into some fortran output error, I split this topic and moved the part about the output error in the "output error" section.. This should help other people to find the correct reference on the same problem in the future.
All your latest posts on this can be found here: ruaumoko. forumattivo. com/outputerrorsf9/visualfortranerrorspringelementt7715.htm, from which you can continue your discussion.
because the conversation moved away from momentrotation modeling, but it changed into some fortran output error, I split this topic and moved the part about the output error in the "output error" section.. This should help other people to find the correct reference on the same problem in the future.
All your latest posts on this can be found here: ruaumoko. forumattivo. com/outputerrorsf9/visualfortranerrorspringelementt7715.htm, from which you can continue your discussion.
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