Function
- Enter the Moment Magnification Factors required for calculating the bending strength considering the moment magnification effect in steel members, slender RC columns and shear walls in which compressive axial forces and bending moments occur simultaneously.
- For a frame braced against sidesway, if the Moment Magnifier is not entered, the program automatically calculates the Moment Magnifier. The Moment Magnifier is reflected in the design member forces in slender columns only. For a sway frame, the program will use the default value of 1.0.
- If the Moment Magnifier is entered manually, the Moment Magnifier will be applied to design member forces in both slender and non-slender columns.
Call
From the Main Menu select [Design] tab > [Type : Steel Design] > [Table] group > [Parameter Tables] > [Moment Magnifier (B1|Delta_b,B2|Delta_s) Table]
From the Main Menu select [Design] tab > [Type : RC Design] > [Table] group > [Parameter Tables] > [Moment Magnifier (B1|Delta_b,B2|Delta_s) Table]
From the Main Menu select [Design] tab > [Type : SRC Design] > [Table] group > [Parameter Tables] > [Moment Magnifier (B1|Delta_b,B2|Delta_s) Table]
From the Main Menu select [Design] tab > [Type : Cold Formed Steel Design] > [Table] group > [Parameter Tables] > [Moment Magnifier (B1|Delta_b,B2|Delta_s) Table]
Input
First, select the members in the model and enter the following:
Option
Select Add/Replace or Delete.
Add/Replace : Add the newly entered values or update the previously entered values.
Delete : Delete the entered values. Data entry is not required when deleting.
Elem : Element number
B1y|Delta_by : Moment magnification factors for members subjected to vertical loads in a frame braced against sidesway for strong axis bending.
If the value is not entered, the program will automatically calculate the Moment Magnifier as per the code. Moment Magnifier will be used only when Braced │Non-sway is selected in Definition of Frame.
B1z|Delta_bz : Moment magnification factors for members subjected to vertical loads in a frame braced against sidesway for weak axis bending.
If the value is not entered, the program will automatically calculate the Moment Magnifier as per the code. Moment Magnifier will be used only when Braced │Non-sway is selected in Definition of Frame.
B2y|Delta_sy : Moment magnification factors for members subjected to horizontal loads in a frame unbraced against sidesway for strong axis bending.
If the value is not entered, Moment Magnifier will be 1.0. Moment Magnifier will be used only when Unbraced │Sway is selected in Definition of Frame.
B2z|Delta_sz : Moment magnification factors for members subjected to horizontal loads in a frame unbraced against sidesway for weak axis bending.
If the value is not entered, Moment Magnifier will be 1.0. Moment Magnifier will be used only when Unbraced │Sway is selected in Definition of Frame