Beam End Release

 

 

Enter the end release conditions (Hinge, Sliding, Roller Joint and Partial Fixity) at both ends of beam elements, or replace or remove previously entered end release conditions.

 

 

 

From the Main Menu select Boundary > Release/Offset > Beam End Release.

 

 

Click to the right of Beam End Release: Display the Beam End Release Table

 Boundary Group Name

Select a Boundary Group in which the specified boundary condition is included. Select "Default" if Group assignment is unnecessary. Click to the right to prompt the "Define Boundary Group" dialog box to add, modify or delete Boundary Groups.

 Options

Add/Replace: Enter or replace end release conditions at both ends of selected beam elements

Delete: Delete previously entered end release conditions at both ends of selected beam elements

General Types and Partial Fixity

Enter connection and partial fixity condition for each DOF at both ends in the element's local coordinate system.

Enter Partial Fixity in terms of the stiffness ratio or the magnitude of stiffness for the relevant beam element.
0.3 for My (bending moment) of i-Node (N1 end node) in the dialog box represents 30% of My flexural stiffness is to be effective.

Type
Relative: Enter the stiffness ratio. For example, 0 and 1 represent the completely released condition and the fully fixed condition, respectively.

Value: True magnitudes of stiffness values

Fx: Release axial force in the element's local x-direction and enter Partial Fixity if necessary.

Fy: Release shear force in the element's local y-direction at the relevant end and enter Partial Fixity if necessary.

Fz: Release shear force in the element's local z-direction at the relevant end and enter Partial Fixity if necessary.

 

Mx: Release torsional moment about the element's local x-axis at the relevant end and enter Partial Fixity if necessary.

My: Release moment about the element's local y-axis at the relevant end and enter Partial Fixity if necessary.

Mz: Release moment about the element's local z-axis at the relevant end and enter Partial Fixity if necessary.

Mb: Release bi-moment about the element's local x-axis at the relevant end and enter Partial Fixity if necessary. Bi-moment method which is approximate method of torsion analysis for considering warping effect.

Note
In construction stage analysis, internally, the program always considers the partial fixities as pinned conditions.  
 

The following buttons simplify the individual data entries described above:


To release the bending stiffness about the element's local y- and z-axes at both ends


To release the bending stiffness about the element's local y- and z-axes at N1 end


To release the bending stiffness about the element's local y- and z-axes at N2 end


To restore all the end release conditions at both ends to fixed conditions
 

Revision of Civil 2014 (v2.1)

Q1. Why member force with partial fixity is different from the value of "original member force x scale force"?