April 9, 2013


Internal Force Summation Tool Basics


The Internal Force Summation Tool has the ability to "cut through" all elements in the model and produce a summation of forces that corresponds with a given load combination. For this example, we will use the following model and review the summation of forces in the vertical members (columns and walls) that support the 1st floor.

IFST 3 D 1

First, select an elevation view (YZ) and select the members that support the first floor by highlighting them.

IFST 3 D 2

Next, use the Lock Unselected Parts of the Model button to hide the unselected elements.

IFST 3 D 3

With the appropriate elements selected, solve either a single combination or a batch solution.

IFST 3 D 4

Next, select the Internal Force Summation Tool from the toolbar on the left side of the 3D window.

IFST 3 D 5

The first two clicks designate the "cutting plane" for the force summation.

IFST 3 D 6 IFST 3 D 7

Next, drag the cutting plane up and down to find your cutting plane’s elevation and click on the desired elevation to set the final location for the "cutting plane".

IFST 3 D 8

After making the 3rd click, the Internal Force Summation results dialog will appear. The axes shown in the dialog correspond to the direction in which the cutting plan was selected with the "1" direction running along the line from Point 1 to Point 2.

IFST 3 D 9

Tags: RISA-3D Results

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