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Equivalent floor load calculation
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ronnie_singh
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PostPosted: Wed Dec 11, 2019 3:08 pm    Post subject: Equivalent floor load calculation Reply with quote

why the result of equivalent floor load (from triangular and trapezoidal load) on beam from slab formula is different from manual calculation or staad floor load. PFA an excel file to verify the possible mistake if any
P.S Plz share your views or comment after or before downloading the file



yield line theory.JPG
 Description:
formula for triangular and trapezoidal load on beam from slab
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yield line theory.JPG



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LOAD CALCULATION.xlsx
 Description:
Equivalent floor load calculation

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 Filename:  LOAD CALCULATION.xlsx
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Last edited by ronnie_singh on Fri Dec 13, 2019 3:06 pm; edited 1 time in total
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syed_A
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PostPosted: Thu Dec 12, 2019 5:18 am    Post subject: Reply with quote

Dear ronnie singh
In cell E14 and E15 you are using standard formula based on yield line to distribute triangular and trapezoidal load on beam, where as in cell S17 and S18 you simply calculating area of triangle and trapezium dividing by its base to get the load on the beam which i think wont match. Hope i understand correctly your doubt


regards
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RJSugantha
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PostPosted: Thu Dec 12, 2019 6:30 am    Post subject: Equivalent floor load calculation Reply with quote

the triangular and trapezoidal load should not be directly divided by the length of the beam.It has to be converted into equivalent udl load. Equivalent udl is obtained  by equating the max moment due to the triangular/trapezoidal load with max moment due to the equivalent udl.

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tosifsayyed
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PostPosted: Thu Dec 12, 2019 9:02 am    Post subject: Reply with quote

Can you share the staad file?
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ronnie_singh
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PostPosted: Thu Dec 12, 2019 9:58 am    Post subject: Reply with quote

syed_A wrote:
Dear ronnie singh
In cell E14 and E15 you are using standard formula based on yield line to distribute triangular and trapezoidal load on beam, where as in cell S17 and S18 you simply calculating area of triangle and trapezium dividing by its base to get the load on the beam which i think wont match. Hope i understand correctly your doubt


regards

dear sefian, yes i have used yield line theory formula in cell E14 and E15. again i have used the area to calculate total load on respective beam i.e in cell Q17 and Q18, dividing with the base to get the respective load in udl in cell S17 and S18 from my understanding. How to convert/calculate the load intensity calculated by Staad into udl as per yield line theory or vice versa.
are the cells E14 and E15 value are equivalent udl?. If so then why the result is not same as calculated by Staad when cell E8 value is applied as floor load
In all there approach:-
1. using cell E14 and E15 value in Staad as udl
2. using cell E8 value in floor load
3. using cell E14 and E15 value in Staad as triangular(uvl) and trapezoidal(uvl+udl) the results are incomprehensible.
PFA of Staad files in zip. N.B Files are of Staad connect edition Version 21



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Stadd file.zip
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N.B Files are of Staad connect edition Version 21

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 Filename:  Stadd file.zip
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tosifsayyed
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PostPosted: Fri Dec 13, 2019 9:05 am    Post subject: Reply with quote

In Staad, when you use floor load, load on beam is calculated as Wlx/3 for both triangular and trapezoidal area and for one way load it is Wlx/2.
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ronnie_singh
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PostPosted: Fri Dec 13, 2019 10:04 am    Post subject: how Reply with quote

tosifsayyed wrote:
In Staad, when you use floor load, load on beam is calculated as Wlx/3 for both triangular and trapezoidal area and for one way load it is Wlx/2.



How? can u show me. i have enclosed the excel and staad file but results are not same. i have input the vaule of Wlx/3 but not same as yield line formula.
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tosifsayyed
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PostPosted: Fri Dec 13, 2019 11:10 am    Post subject: Reply with quote

Sorry, that's my mistake, staad is taking WLx/2 for both one way and two way slab (triangular and trapezoidal). But it should be taken as WLx/3 for triangular and trapezoidal part of two way slab and WLx/2 for one way slab, if you want to apply it on each and every individual beam.

This is what the discussion I had with one of my senior.
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ronnie_singh
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PostPosted: Fri Dec 13, 2019 3:13 pm    Post subject: Reply with quote

tosifsayyed wrote:
Sorry, that's my mistake, staad is taking WLx/2 for both one way and two way slab (triangular and trapezoidal). But it should be taken as WLx/3 for triangular and trapezoidal part of two way slab and WLx/2 for one way slab, if you want to apply it on each and every individual beam.

This is what the discussion I had with one of my senior.


So what is your senior's views on it. See formula is correct, staad is also correct, both can be derived but can't be converged. Will be glad if anyone can explain
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ronnie_singh
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PostPosted: Fri May 01, 2020 2:14 pm    Post subject: Re: Equivalent floor load calculation Reply with quote

RJSugantha wrote:
the triangular and trapezoidal load should not be directly divided by the length of the beam.It has to be converted into equivalent udl load. Equivalent udl is obtained  by equating the max moment due to the triangular/trapezoidal load with max moment due to the equivalent udl.

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Dear Sefian, it seems like i have missed your comment but finally i have noticed. Will you please elaborate with the same example i have enclosed in excel format. i will try from my end but will be more clear if you show me.

Thanks & Regards
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