reduced result in panel

[saclovitzky]

Hello,

I've just modelled a simple wall and I notice in "reduced results for panels", there's a discrepancy of result in the resulting Axial loads reactions(NRx).

Pls. find attached screenshot and file. Is my observation correct?

Regards,

[Artur.Kosakowski]

What you are checking is the accuracy of the function that describes shear in surface elements for point loads. The value should be 0 (for case 4) for all horizontal cuts and you will be close to this value when you apply horizontal load (case 4) as a linear load along the left edge instead. 

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[saclovitzky]

Hello Artur,

Can you further explained Artur, I still dont get it

Regards,

[Artur.Kosakowski]

The difference in values is based on the fact that the reduced results are calculated as the integration of forces obtained along a cut made just above the edge of the panel. The precision of this value is the function of the mathematical formula that describes these elements and the number of elements along the edge you generate whereas for values of the reactions you will get the exact ones. 

What I wanted to focus your attention to was that for top and middle cuts the values obtained for loads with point horizontal forces are less accurate than for other types of loads. 

[saclovitzky]

Hello Artur,

thanks for your reply.

Regarding the MRz(kNm) result, 3-4/ 2(C) = -3551.32, is this value correspond the "overturning moment" = 3(409.64) +6(409.85) = -3668.02kNm(quite close to the manual calculation, while, 3-1-4-8/ 2(C) = -1158.77, is this the value for the "Net Moments = Moverturning - Mresisting; Mresisting =

83.51(6.38)(6.38/2) + 6.38(6)(0.20)(25)(6.38/2) = 2311.61, therefore, Net Moments = 3688.02 - 2311.61 = 1376.41(quite close to -1158.77).

Am I correct on this?

Regards,

[saclovitzky]

Also,In reference to my previous response.

 when I change the values for all horizontal forces to “1 kN”, MRz result, 3-4/ 2(C) = -8.67(still close to manual calc(3x1 + 6X1 = 9 kNm), while 3-1-4-8/ 2(C) = -2.83, I do not know now what this values mean,it no longer the net moment that I assumed with the previous result. Any ideas will be greatly appreciated.

[Artur.Kosakowski]

See the attached picture.

If you find your post answered press the Accept as Solution button please. This will help other users to find solutions much faster. Thank you.

[saclovitzky]

Thanks Artur,

Approximately, where can I find the net moment results,ie, Mnet = Mot - Mr, is this in "4-8/ 2(C) = 2210.46 ?

Mot = 3688 kN.m

Mr   = ((83.51x6.38x6.38/2) + (6x6.38x.20x25x6.38/2))2/3 = 1536 kN.m

therefore, 3688-1536 = 2152 kNm(quite close)

Is this correct?

Regards,