member bilinear factors
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member bilinear factors
Hello
I'm Francesco.
I'm using Ruaumoko for Puschover analysis.
I want to ask you some questions:
1) What does RA Bilinear factor (or RambergOsgood r) (Axial) and RB Bilinear factor (or RambergOsgood r) (Flexure) mean when i write in (insert in ruaumoko) the member bilinear factors and hinge properties?
2)Does the user have to insert "curvature ultimate" and "moment ultimate" or the program calculate then automaticaly after writing the parameters at the point 1) and yield interaction surface
i'm sorry for my not good english
thanks a lot
Francesco
I'm Francesco.
I'm using Ruaumoko for Puschover analysis.
I want to ask you some questions:
1) What does RA Bilinear factor (or RambergOsgood r) (Axial) and RB Bilinear factor (or RambergOsgood r) (Flexure) mean when i write in (insert in ruaumoko) the member bilinear factors and hinge properties?
2)Does the user have to insert "curvature ultimate" and "moment ultimate" or the program calculate then automaticaly after writing the parameters at the point 1) and yield interaction surface
i'm sorry for my not good english
thanks a lot
Francesco
frapicci Posts : 4
Join date : 20101011
Re: member bilinear factors
Ciao Francesco,
1) the r factor is the ratio between the postyield and the preyield stiffness. For example 0.05 means that after yielding the stiffness of the member is only 5% of the initial stiffness.
2) I am not sure what you are asking but you will have to calculate your ultimate curvature with a sectional analysis program, and then check manually at which step ruaumoko reaches it. I do not think there is a way in Ruaumoko to make it stop when a certain curvature value is reached.
Don't worry about the English, as long as people can understand you you are fine!
Repeat you introduction in the welcome section, where everybody can read it!
Ciao.
P.S. I will soon move this post in the member modeling section where it should belong.
1) the r factor is the ratio between the postyield and the preyield stiffness. For example 0.05 means that after yielding the stiffness of the member is only 5% of the initial stiffness.
2) I am not sure what you are asking but you will have to calculate your ultimate curvature with a sectional analysis program, and then check manually at which step ruaumoko reaches it. I do not think there is a way in Ruaumoko to make it stop when a certain curvature value is reached.
Don't worry about the English, as long as people can understand you you are fine!
Repeat you introduction in the welcome section, where everybody can read it!
Ciao.
P.S. I will soon move this post in the member modeling section where it should belong.
Bilinear factors
These factors represent the postyield stiffness of the members, see the "r" in the figures in the Appendix B of the manuals. In the very first version of the programs the only data required were the yield actions and the bilinear factors as the only hysteresis models were bilinear (elastoplastic is a subset) and RambergOsgood so these data items are separate from the rest of the hysteresis data. I have a policy of full backwards compatibility with the data so 20 year old data sets should still run with no changes and give the same answers (assuming no corrections affect the results) as were obtained 20 or 30 years ago. This means that possible tidying of the data is not so easy. New features have to work but all the old ones have to work as well. RA and RF (frame members) or RF and RT (spring members) are to allow different bilinear factors for the axial actions and flexural actions or between the spring translation terms and the spring rotation (theta) actions.
Athol Carr Posts : 115
Join date : 20091209
Location : Christchurch, New Zealand
Re: member bilinear factors
Dear professor,
thank you for your kind answer.
I have to model simple cantilever subjected to axial and horizontal loads. I want to introduce a bilinear sectional model (momentcurvature law).
In the following i wrote the two lines of the program for the hysteric model:
0 0.000835 0.246 0.246 ! Member Bilinear factors and Member hinge
5202 2160 313 290 235 145 831 0 ! Yield surface
My doubt is if I have to introduce "r" factor in the first position (RA axial) or in the second position (RF flexural). I remind you that my case study is a cantilever subjected to axial and horizontal loads. I'm looking forward to your answer.
Thank you
Best regards
Francesco
thank you for your kind answer.
I have to model simple cantilever subjected to axial and horizontal loads. I want to introduce a bilinear sectional model (momentcurvature law).
In the following i wrote the two lines of the program for the hysteric model:
0 0.000835 0.246 0.246 ! Member Bilinear factors and Member hinge
5202 2160 313 290 235 145 831 0 ! Yield surface
My doubt is if I have to introduce "r" factor in the first position (RA axial) or in the second position (RF flexural). I remind you that my case study is a cantilever subjected to axial and horizontal loads. I'm looking forward to your answer.
Thank you
Best regards
Francesco
frapicci Posts : 4
Join date : 20101011
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