Function
- Effective weights of a story and an adjacent story are calculated, and the regularity of weight distribution is checked and tabulated in a spread sheet format.
- When "Story Shear Force Ratio>Consider Story Module" is checked in the "Model/Building/Control Data", accurate shear forces can be obtained for the story having the overlapping Module.
- When Modules are defined in Structure > Building > Story > Define Module button, the Module data is displayed in the first column of the table.
- When the ratios exceed the allowable limit, they appear in red and 'Irregular' is printed in the Remark.
- Table Tool in Gen NX offers a variety of powerful built-in functions. Refer to Usage of Table Tool for detail directions.
Call
From the Main Menu select [Results] tab > [Type : Analysis Result] > [Table] group > [Story Tables] > [Weight Irregularity Check Table]
From the Main Menu select [Results] tab > [Type : Analysis Result] > [Table] group > [Story Tables] > [Mass Irregularity Check Table]
Input
From Record Activation Dialog, select the load cases/combinations for which Weight Irregularity will be checked. Story Weight is the same irrespective of a loading condition. The reason for entering load cases here is to check if the lateral drifts of two consecutive stories differ by more than 130%. If it is less than 130%, Weight Irregularity need not be considered.
Refer to Usage of Table Tool and check the following data:
When Modules are not defined
Load Case : Load case/Combination
Story : Story ID
Level : Story Elevation
Height : Story Height
1. Story Weight
Story Weight is calculated from Story Mass (Additional Mass included) from Query multiplied by the acceleration of gravity.
Note 1
Additional mass for the 1st floor is not reflected in the weight irregularity check.
2. Adjacent Story Weight
1.5 M(Upper): Story Weight of the story immediately above the current story is multiplied by 1.5
1.5 M(Lower): Story Weight of the story immediately below the current story is multiplied by 1.5
3. Story Weight Ratio
Story Weight Ratio: "Story Weight" / ("Adjacent Story Weight " smaller of two values)
4. Story Drift Angle Ratio
Story Drift Angle Ratio: "Story Drift Angle at a current story" / " Story Drift Angle at the story above the current story"
5. Remark
If Story Weight Ratio exceeds 1.0 and Story Drift Angle Ratio exceeds 1.3, "Irregular" is printed, otherwise, "Regular" is printed.
(If "Story Drift Angle Ratio" does not exceed 1.3, "Regular" is printed irrespective of the "Story Weight Ratio".)
When Modules are defined
The Module column is generated only when the Modules are defined. Weight irregularity check results are generated as per the following Note.
Module : Module name is defined in Structure > Building > Story > Define Module button
Load Case : Load case/Combination
Story : Story ID
Level : Story Elevation
Height : Story Height
1. Story Weight
Story Weight is calculated from Story Mass (Additional Mass included) from Query multiplied by the acceleration of gravity.
Note 1
Additional mass for the 1st floor is not reflected in the weight irregularity check.
2. Adjacent Story Weight
1.5 M(Upper): Story Weight of the story immediately above the current story is multiplied by 1.5
1.5 M(Lower): Story Weight of the story immediately below the current story is multiplied by 1.5
3. Story Weight Ratio
Story Weight Ratio: "Story Weight" / ("Adjacent Story Weight " smaller of two values)
4. Story Drift Angle Ratio
Story Drift Angle Ratio: "Story Drift Angle at a current story" / " Story Drift Angle at the story above the current story"
5. Remark
If Story Weight Ratio exceeds 1.0 and Story Drift Angle Ratio exceeds 1.3, "Irregular" is printed, otherwise, "Regular" is printed.
(If "Story Drift Angle Ratio" does not exceed 1.3, "Regular" is printed irrespective of the "Story Weight Ratio".)
When Modules are not defined
Load Case : Load case/Combination
Story : Story ID
Level : Story Elevation
Height : Story Height
1. Story Weight
Story Weight is calculated from Story Mass (Additional Mass included) from Query multiplied by the acceleration of gravity.
Note
Additional mass for the 1st floor is not reflected in the weight irregularity check.
2. Adjacent Story Weight
1.25M(Lower): Story Weight of the story immediately below the current story is multiplied by 1.25
0.75M(Lower): Story Weight of the story immediately below the current story is multiplied by 0.75
3. Story Weight Ratio
Story Weight Ratio for nth story= (Mn-Mn-1)/Mn-1 , where Mn is the story weight of the nth story
4. Remark
If -0.25<Story Weight Ratio<0.25 , "Regular" is printed, otherwise, "Irregular" is printed.
Note
When the story weight of a particular story is bigger than 1.25 times or lower than 0.75 times the weight of the story below, then the story will be defined as irregular.
When Modules are defined
The Module column is generated only when the Modules are defined. Weight irregularity check results are generated as per the following Note.
Module : Module name is defined in Structure > Building > Story > Define Module button
Load Case : Load case/Combination
Story : Story ID
Level : Story Elevation
Height : Story Height
1. Story Weight
Story Weight is calculated from Story Mass (Additional Mass included) from Query multiplied by the acceleration of gravity.
Note 1
Additional mass for the 1st floor is not reflected in the weight irregularity check.
2. Adjacent Story Weight
1.25 M(Lower): Story Weight of the story immediately below the current story is multiplied by 1.25
0.75 M(Lower): Story Weight of the story immediately below the current story is multiplied by 0.75
3. Story Weight Ratio
Story Weight Ratio for nth story= (Mn-Mn-1)/Mn-1 , where Mn is the story weight of the nth story
4. Remark
If -0.25<Story Weight Ratio<0.25 , "Regular" is printed, otherwise, "Irregular" is printed.
Note
When the story weight of a particular story is bigger than 1.25 times or lower than 0.75 times the weight of the story below, then the story will be defined as irregular.
When Modules are not defined
Load Case : Load case/Combination
Story : Story ID
Level : Story Elevation
Height : Story Height
1. Story Mass
Story Mass (Additional Mass included) is obtained from Query > Story Mass table.
Note
Additional mass for the 1st floor is not reflected in the weight irregularity check.
2. Adjacent Story Mass
1.5M(Upper): Story Mass of the story immediately above the current story is multiplied by 1.5.
1.5M(Lower): Story Mass of the story immediately below the current story is multiplied by 1.5.
3. Story Mass Ratio
Story Mass Ratio for nth story = Mn / min(1.5Mn-1 , 1.5Mn+1 ), where Mn is the story weight of the nth story
4. Remark
If Story Mass Ratio < 1.0, "Regular" is printed, otherwise, "Irregular" is printed.
Note
Mass Irregularity Check table is provided to check if the effective mass of any story is more than 150% of the effective mass of an adjacent story.
When Modules are defined
The Module column is generated only when the Modules are defined. Mass irregularity check results are generated as per the following Note.
Module : Module name is defined in Structure > Building > Story > Define Module button
Load Case : Load case/Combination
Story : Story ID
Level : Story Elevation
Height : Story Height
1. Story Mass
Story Mass (Additional Mass included) is obtained from Query > Story Mass table.
Note
Additional mass for the 1st floor is not reflected in the weight irregularity check.
2. Adjacent Story Mass
1.5M(Upper): Story Mass of the story immediately above the current story is multiplied by 1.5.
1.5M(Lower): Story Mass of the story immediately below the current story is multiplied by 1.5.
3. Story Mass Ratio
Story Mass Ratio for nth story = Mn / min(1.5Mn-1 , 1.5Mn+1 ), where Mn is the story weight of the nth story
4. Remark
If Story Mass Ratio < 1.0, "Regular" is printed, otherwise, "Irregular" is printed.
Note
Mass Irregularity Check table is provided to check if the effective mass of any story is more than 150% of the effective mass of an adjacent story.