User Guide

Tutorial 3 - Loading
Version 5.0 89
These lines should now be shaded yellow. If they are magenta you selected cells
in the spreadsheet, not the button on the very left. If you have selected the rows
correctly the line delete button on the Window Toolbar should be active.
Once you have the lines selected, click the Delete Lines button on the
Window Toolbar.
The lines are deleted leaving you with 10 combinations. Next we will delete
combinations 9 through 10. You may also delete lines in a spreadsheet one at a
time.
Click on the last entry in the Description column. Hit the F4 key on your
keyboard twice to delete load combinations 10 and 9.
These load combinations are sufficient for our steel and wood members.
However, we will have to add more load combinations for the design of our
concrete members.
On right side of the Window Toolbar click the arrow on the drop down list and
select the first choice: “ACI Strength” and click the button next to the list.
Click on the last entry in the Description column. Hit the F4 key on your
keyboard twice to delete load combinations 12 and 13.
The Load Combinations spreadsheet should now look like this:
Look over your load combinations to make sure they are the same as above and
then click the Design tab to view more load combination data.
The field labeled ASIF is used to enter the allowable stress increase factor for the
design of hot rolled steel per AISC 9th Edition specifications. Since we are
using the ASCE load combinations, this increase factor (usually 1.333 for wind or
seismic loads)will not be used. An entry in this field greater than 1.0 is also used
to indicate whether the seismic provisions of the LRFD code are to be used.
CD is the load duration factor used only in timber design. This factor is
dependent on the load with the shortest duration that is present in the load
combination.
The Service checkbox indicates whether the load combination is for service level
loads. This will affect the stiffness used for concrete members during the
solution.