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PROGRESSIVE COLLAPSE

 
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lemya musthafa
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Joined: 21 Feb 2019
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PostPosted: Thu Feb 21, 2019 5:33 am    Post subject: PROGRESSIVE COLLAPSE Reply with quote

HI

CAN ANYONE EXPLAIN ME THE COMPLETE PROCEDURE OF DOING NONLINEAR DYNAMIC ANALYSIS FOR PROGRESSIVE COLLAPSE IN ETABS17, IF I TAKE A 8 STOREY BUILDING, AFTER REMOVING THE COLUMNS (OF GROUND, 4 TH OR ROOF) WHERE WILL BE THE MAXIMUM DISPLACEMENT OBTAINED, GROUND, 4 TH OR ROOF. WHY?

LEMYA MUSTHAFA
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abhio
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Joined: 08 Mar 2010
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PostPosted: Thu Feb 21, 2019 11:10 am    Post subject: Reply with quote

Dear Er Lemya,

If you remove all the columns at a floor, then the portions above and below will become separate pieces. In particular, the upper part will not have any supports at all, and cannot be solved by standard displacement based stiffness method (the diagonal terms of the stiffness matrix become zero).

There are some types of software which can simulate impact between different objects, such as those used for simulating crash tests of vehicles.
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lemya musthafa
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PostPosted: Fri Feb 22, 2019 7:27 am    Post subject: Reply with quote

SIR

I AM NOT REMOVING ALL THE COLUMNS. I WILL ONLY REMOVE ONE COLUMN AT A TIME, AT DIFFERENT LOCATIONS SUCH AS CORNER, EDGE, MIDDLE. OF DIFFERENT FLOORS. I JUST WANT TO KNOW LOSS OF WHICH COLUMN GIVE MAXIMUM DISPLACEMENT.

LEMYA
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rahul.leslie
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Joined: 01 Apr 2008
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PostPosted: Sat Feb 23, 2019 10:12 am    Post subject: Reply with quote

Max. displ is expected to be at the point where the column support is removed, i suppose. But i wonder why you want to remove columns of 4th and roof.

Anyway, you need to insert non-linear hinges in the members... and also include geometric non-linearity as well, in the analysis, to get the 'tie-action'.

Also, if i remember correctly (of what i read quite long time back), the loads in the contributory area of the column to be removed is to be doubled: refer to the code for exact details.
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VPandya
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PostPosted: Sat Feb 23, 2019 5:12 pm    Post subject: In USA you have to meet Code IBC 2015 , ASCE 7-16 requiremenmts . Reply with quote

Dear Sefi Engineers ,
I suggest you use attached document on Progressive Collapse Design . Reason is ,  in USA you have to meet Code IBC 2015 ,  ASCE 7-16 requirements . This is a very complete document on  PROGRESSIVE COLLAPSE  DESIGN ,  WITH  DESIGN EXAMPLES  OF BOTH  STEEL  AND  CONCRETE  BUILDINGS .  

UFC 4-023-03 DESIGN OF BUILDINGS TO RESIST PROGRESSIVE COLLAPSE, WITH CHANGE-- 3  
Date:
07-14-2009
Change / Revision Date 11/1/2016


Copy  of  UFC 4-023-03  attached :

Regards .

Vasudeo  Pandya  P.E.
Structural  Engineer
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