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modal mass participation result
2

modal mass participation result

modal mass participation result

(OP)
In the results table below, I find that for the first mode the value in Ux direction and Ry are very important nomaly only one value should be expressive.is this good result.



Mode    Period    UX    UY    UZ    SumUX    SumUY    SumUZ    RX    RY    RZ    SumRX    SumRY    SumRZ
1    0,910045    75,2861    0,0007    0,0000    75,2861    0,0007    0,0000    0,0011    99,4974    0,0053    0,0011    99,4974    0,0053
2    0,430470    0,0016    72,1128    0,0000    75,2877    72,1135    0,0000    98,7345    0,0011    0,0815    98,7356    99,4985    0,0868
3    0,375553    0,0096    0,0385    0,0000    75,2972    72,1519    0,0000    0,0469    0,0081    70,9066    98,7825    99,5067    70,9934
4    0,197741    10,2317    0,0011    0,0000    85,5289    72,1530    0,0000    0,0016    0,1217    0,0081    98,7841    99,6284    71,0015
5    0,104799    0,0003    10,7728    0,0000    85,5292    82,9258    0,0000    0,7230    0,0000    2,8893    99,5071    99,6284    73,8908
6    0,088809    6,1742    0,0010    0,0000    91,7033    82,9268    0,0000    0,0001    0,2856    0,0017    99,5072    99,9140    73,8925
7    0,079276    0,0003    3,0483    0,0000    91,7037    85,9751    0,0000    0,2256    0,0001    11,7153    99,7327    99,9141    85,6078
8    0,059936    0,0001    0,1440    0,0000    91,7037    86,1191    0,0000    0,0062    0,0000    0,0271    99,7390    99,9141    85,6349
9    0,052271    3,3125    0,0002    0,0000    95,0162    86,1193    0,0000    0,0000    0,0421    0,0004    99,7390    99,9562    85,6353
10    0,048579    0,0004    4,7498    0,0000    95,0166    90,8691    0,0000    0,1507    0,0000    1,3878    99,8897    99,9562    87,0231
11    0,038883    4,8055    0,0002    0,0000    99,8220    90,8693    0,0000    0,0000    0,0434    0,0009    99,8897    99,9997    87,0241
12    0,036300    0,0003    2,2210    0,0000    99,8224    93,0904    0,0000    0,0687    0,0000    4,5193    99,9584    99,9997    91,5434

RE: modal mass participation result

Absolutely good result, With the inclusion of 12 modes, modal mass participation achieved more than 90% in two translation & rotation degrees of freedom.

-Murali

RE: modal mass participation result

(OP)
Thanks

RE: modal mass participation result

(OP)
My question is "is it normal to find in the same mode two values with high ratio, in my case for the first mode i have
   - Ux 75,2861  
   - Ry 99,4974 ."

                    thanks.

RE: modal mass participation result

That just means the first fundamental period of the building is a combined translational/torsional mode.  It is not necessarily normal or not normal - it just depends on the layout of the lateral system in the building versus the mass distribution.  You will want to make sure to design for any torsional irregularities per code.  

RE: modal mass participation result

(OP)
Thanks Willis

RE: modal mass participation result

Hi DENSAL55

As per your results, the modes are really uncoupled. i.e the first mode Ux = 75% & Ry (Over turning moment about y-y axis = 99.4%), Second mode Uy = 72.11% & Rx(Over turning moment about x-x axis = 98.75%) & Third mode Rz = 71% (Torsion mode)

Hope you understand.

RE: modal mass participation result

(OP)
Thanks Murali27

RE: modal mass participation result

Murali27, what uncoupled modes mean?

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