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er.vikramjain
SEFI Regulars
Joined: 07 Nov 2009
Posts: 34
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 Posted: Mon Jun 27, 2022 2:12 am Post subject: Post Tension - Column Stiffness |
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Dear All,
Is there any clause/notes of Post Tension saying need to assign column stiffness to 100% for outer most column and 50% for internal column?? |
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vikram.jeet
General Sponsor
Joined: 26 Jan 2003
Posts: 3470
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| Posted: Mon Jun 27, 2022 3:26 am Post subject: |
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This viewpoint is in no way answer to querry but some reference.
In manual design era , Portal Method was used to distribute horizontal forces (EQ/wind) , and in this method stiffness of outer column is taken as 50% of its actual stiffness and for inner column it is taken 100% of its stiffness . Horizontal forces were distributed accordingly.
Idea was that inner column is more stiff as it is having monolithic beams on either side in direction of EQ , whereas outer column is having beam only on one side.
cognizance of above fact can be taken or not is designer's judgement. |
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