<
From version < 40.3 >
edited by Fredrik Lagerström
on 2020/03/27 11:13
To version < 41.1 >
edited by Fredrik Lagerström
on 2020/03/27 11:16
>
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825 825  
826 826  Figure: Settings of Alpha
827 827  )))
828 -)))
829 829  
830 -
831 -| |(((
829 +* **Effective mass**
830 +The modal effective masses can be compared to the total mass or reduced mass at //Eff. mass//:
832 832  
833 -)))
834 834  
835 -=== **Effective mass** ===
836 -
837 -The modal effective masses can be compared to the total mass or reduced mass at //Eff. mass//:
838 -
839 839  |(% style="width:128px" %)(((
840 840  [[image:1585303685867-313.png]]
841 841  )))|(% style="width:1362px" %)In //FEM-Design// “//Reduced mass//” means the difference between the total mass of the structure and the basement mass. The basement mass is the sum of all masses which lay on the foundation level (set at //Seismic load/ Others//).
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846 846  It is uninterested in the calculation point of view, that effective masses are compared to the total or the reduced mass, because these values are given in percentage and only gives information, that which mode shape is the fundamental or which shapes are dominant in a given direction.
847 847  )))
848 848  
843 +*
844 +
849 849  At //Options//, more calculation properties can be set:
850 850  
847 +*
851 851  
852 -|(((
853 -[[image:file:///C:/Users/Fredrik/AppData/Local/Temp/msohtmlclip1/01/clip_image007.png||alt="se_95_seismic%20options"]]
854 -)))
849 +
855 855  
856 -=== **Combination rule** ===
857 -
851 +**Combination rule**
858 858  The combination rule of effects in the //x'//, //y'// and maybe //z// directions can be set here. You can choose from two possibilities.
859 859  
860 -**Consider torsional effect / Consider second order effect**
861 -
854 +* **Consider torsional effect / Consider second order effect**
862 862  Additional effects can be taken into consideration during seismic calculation. See the detailed description of these effects in //Theory book//.
856 +
863 863  
864 864  |(% style="width:107px" %)[[image:warning.png]]|(% style="width:1383px" %)The calculation of both effects needs the definition of (% class="wikiinternallink" %)**storeys**(%%).
865 -
866 -**~ **
867 -
868 -1. **Seismic calculation**
869 -
859 +)))
860 +1. ​​​​​​​**Seismic calculation**
870 870  After choosing a calculation method and setting its properties, activate first //Seismic analysis// under //Analysis// and then press //OK//.
871 871  
872 872  == The Results ==
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FEM-Design Wiki