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Post Tension - Column Stiffness

 
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er.vikramjain
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Joined: 07 Nov 2009
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PostPosted: Mon Jun 27, 2022 2:12 am    Post subject: Post Tension - Column Stiffness Reply with quote

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
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Joined: 26 Jan 2003
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PostPosted: Mon Jun 27, 2022 3:26 am    Post subject: Reply with quote

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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