User Guide

RISA-3D User’s Guide
Version 5.0
102
Batch Solution
The Batch solution solves multiple combinations, keeping the results for all of
them. The results spreadsheets may then be organized either by load combination
or by item.
Click on the Solve button again and this time choose Batch solution. Click
Solve. You will be warned that the results will be cleared. Select Ye s.
RISA-3D always clears the results when you are making changes to the model
thus avoiding the possibility that you could have results that don't match the input
data. You will be prompted to make sure you wish to clear the results before
doing so. This is because you may not want to purge results for a large model that
took some time to solve. RISA-3D does retain the decomposed stiffness matrix,
so as long as the data items you edit do not impact the stiffness matrix, subsequent
solutions will be much faster. You may override the warning in the Preferences.
With the Batch solution finished you may now choose different load
combinations when plotting results. Each view may show results from a different
combination.
Click in the lower left view to make it active and click on the Set Plot Options
button . At the bottom change the Combination to Use for Results Display
to “8: ASCE 4 (b)” and click OK.
The lower left view now shows results for load combination 8, with the wind load
in the opposite direction.
On the Results menu choose Reactions to display them once again.
For the Batch solution the spreadsheets display all of the results for each load
combination. Currently the results are grouped by combination; all of the
reactions for Load Combination 1 are listed first and then for each combination
thereafter. The combination number is listed in the first column. You can also
group the results so that all the reactions for joint N1 are together, then N2, and so
on…
On the Results menu choose Results Presentation
Batch Results Listed By
Item to display them joint by joint. The first column shows the load combination.
Now let’s take a closer look at our concrete results.
On the Results menu choose Members
Design Results. Then select the
Concrete Beams tab.
Take a minute to browse these beam results. This spreadsheet presents a
maximum code check for the top reinforcing (negative bending), the bottom
reinforcing (positive bending) and for beam shear. In addition, the factored beam
capacities are given for each critical location.
Notice how no governing load combination is listed for the concrete code check.
This is because the rebar layout for a concrete beam is always based on an
envelope of the design forces.