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Design for Vertical Earthquake Effects as per IS 1893 Part1: 2016

 
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aditya
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Joined: 05 Apr 2008
Posts: 144

PostPosted: Mon May 21, 2018 4:33 pm    Post subject: Design for Vertical Earthquake Effects as per IS 1893 Part1: 2016 Reply with quote

Dear Sefians,
I need to carrry out seismic analysis and design of a multi-storeyed building in Zone V. As per clause 6.3.3.1 of IS 1893: Part 1-2016, we need to consider vertical earthquake effects. I need clarifications on the following points regarding the application of clause:
1.  Design vertical seismic coefficient=(2/3)x design horizontal seismic coefficient. Now shall we calculate base shear=design vertical seismic coefficient x seismic weight?
2. base shear calculated in point 1 above shall be applied in +/- vertical direction (i.e. down and up?)?
3. How shall we carry out storey-wise distribution of this "vertical?"base shear?
4. What will be the point of application of storey-wise vertical seismic forces? Centre of mass of each storey?
5. Shall we consider separate load cases EQz+ and EQz-?
6. Load combinations shall be as per clause 6.3.4.1?
Can somebody help in this regard with example?
with best regards,
Aditya
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u.mukesh
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Joined: 26 Jan 2003
Posts: 97
Location: Delhi

PostPosted: Thu May 24, 2018 7:30 am    Post subject: Design for Vertical Earthquake Effects as per IS 1893 Part1: 2016 Reply with quote

Hello dear

Vertical earthquake will increase (when downward) the moments in beams;
and all these reactions from beams (at diff floors) will increase the axial force in columns.


You should make proper combinations and you will get the forces.
There is no logic of vertical base shear..........


as vertical loads will create additional axial forces in columns and foundations.


Regards


Mukesh Upadhyay


On Mon, May 21, 2018 at 10:03 PM, aditya <forum@sefindia.org (forum@sefindia.org)> wrote:
Quote:
           Dear Sefians,
I need to carrry out seismic analysis and design of a multi-storeyed building in Zone V. As per clause 6.3.3.1 of IS 1893: Part 1-2016, we need to consider vertical earthquake effects. I need clarifications on the following points regarding the application of clause:
1. Design vertical seismic coefficient=(2/3)x design horizontal seismic coefficient. Now shall we calculate base shear=design vertical seismic coefficient x seismic weight?
2. base shear calculated in point 1 above shall be applied in +/- vertical direction (i.e. down and up?)?
3. How shall we carry out storey-wise distribution of this "vertical?"base shear?
4. What will be the point of application of storey-wise vertical seismic forces? Centre of mass of each storey?
5. Shall we consider separate load cases EQz+ and EQz-?
6. Load combinations shall be as per clause 6.3.4.1?
Can somebody help in this regard with example?
with best regards,
Aditya
     



     


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aditya
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Joined: 05 Apr 2008
Posts: 144

PostPosted: Fri May 25, 2018 2:10 am    Post subject: Reply with quote

Dear Er. Mukesh Upadhyay Sir,
Thanks a lot for your suggestions. I am looking after how to calculate the earthquake forces to simulate the effect of vertical seismic forces in a building and how to apply it as per codal provisions. It would be great if somebody would suggest on how to model it in seismic coefficient method through Staad.pro/SAP2000/ETABS software or even through manual calculation.
with best regards and thanks,
Aditya
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