RAM Structural System Help

Redundancy Factors

The Redundancy values can be displayed by invoking the Process – Results – Redundancy Factors command. A value is calculated for each member for each analyzed seismic load case, based on the lateral shear taken by that member, even if that particular member did not produce the controlling rmaxi used in Equation 16-32 (IBC2000). The calculated value for each column, brace and wall above the Ground Level is shown. The members are color-coded as well to graphically indicate the magnitude of the Redundancy coefficient. By displaying the values for each member individually, it makes it easier to identify which areas of the structure need to be modified by adding additional frames or where frames can be eliminated. The text for the redundancy factors can be turned off by un-checking the "show values" button.

Note that the actual Redundancy Coefficient associated with a given seismic load case is the largest value from any of the members, limited to a minimum of 1.0 and a maximum of 1.5.

For IBC 2006/ASCE 7-05, the program does not do any determination of the Redundancy factors. It is input as part of the Load Combination generators. Hence there is no option in this command to show the IBC 2006 redundancy factors.

Close terminates the command. When the command is terminated, the currently displayed values and color coding remain on the screen. They can be cleared by selecting the Reset Model button.