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kirtesh604 at yahoo.com Guest
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Posted: Tue Jun 08, 2004 5:55 pm Post subject: Modelling of slabs and infill panels in Multi-storied |
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Dear Mr. Desai,
As Dr. Jain has discussed brick infills get separated out due to tension. But they can be modelled as diagonal bracings in such a way that bracings act as compression member only by providing equivalent properties of infills.
In my view master – slave command gives only diaphragm action within the specified plane of action but it doesn’t incorporate effect of plate rigidity due to slab stiffness. It is better to have diagonal bracings in horizontal plane with equivalent properties of slab which may be effective in both tension and compression.
Please Try it and discuss your results.
Regards
Kirtesh Gandhi
--- rsmengr@eth.net wrote:
Quote: | Dear Anand:
In master slave option slabs are flexible out of their plane but rigid in their own plane, If you have large cutouts then situation is more complicated. You have to examine it carefully. Best option is to use shell elements with plate and membrane stiffness both and see the magnitude of shears developing at critical slab sections.
Master node location can be any point at the floor level. This point was discussed earlier too in the e-conference.
If you are a SAP2000 or ETABS user send me an e-mail (at my personal ID) and I will send you a few input files to make this issue clear.
Hope this helps.
Regards
Rajiv ----- Original Message ----- Message From <snehal.bhatt@mottmac-india.com> To: <rsmengr@eth.net> Sent: Tuesday, June 08, 2004 10:42 AM Subject: Modelling of slabs and infill panels in Multi-storied Buildings....
In application of " master slave command" some issue needs to review
1) whether, the slab is rigid or flexible. ( If there is any large cut out ) 2) The defination of master point. either or c.g. of the particular floor or or center of rigidity of the same floor? bcs results will be quiet different in both the cases. And at the same time, storey torsion is also coming in the analysis as per your defination of master node.
So, other option also you can try out horizontal bracings members at floor level to model slab. As Jain sir discussed in infill walls.
with Regards,
Anand Shah
With regards,
Anand
Original Message----- Message From mc.upadhyay [mailto:mc.upadhyay@jil.co.in] Sent: Mon 6/7/2004 11:03 PM To: Snehal Bhatt Cc: Subject: Modelling of slabs and infill panels in Multi-storied Buildings....
Hello Mr Desai You can use master slave command for diaphragm action without modelling the floor as elements. This will save the memory & time.
At present our codes do not allow the modelling of infill masonry walls.
There was an econference on "Modelling issues" long time back on SEFI & there was a lot of discussion on diaphragm action; you can see the website.
Regards
Mukesh Chandra Upadhyay
jydesai@desein.c om To: mc.upadhyay@jil.co.in cc: 06/07/04 12:25 Subject: Modelling of slabs and infill panels in Multi-storied Buildings.... PM Please respond to general
Sir
I seek suggestions/help in the matter of modeling floor-slabs/infill masonry walls for lateral load analysis, without over-taxing the computer memory and time.
I feel that modeling these with single large plate-elements for each panel bordered by edge-beams in case of a floor, or edge-beams and columns in case of an infill panel should provide the necessary in-plane stiffness to such panels. But I am not sure if anything further needs to be put in for these elements, to more correctly model this stiffness. Does the thickness of the large elements need to be increased to account for continuous physical contact with the edge members,( to some-how account for the lateral constraints on such elements),which is not modeled in the large element? Is there any publication on this subject, which can be easily accessed? Is there an alternate way to formulate the sectional properties of equivalent diagonal bracing members if used to model such panels in lieu of plate-elements?
I have been looking for answers both analytical and qualitative in Technical Literature/Journals, but could not find satisfactory concrete answers, which one could use in Computer Programs.
Yours sincerely
<http://www.desein.com>
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