00:00Now the next thing we do for model management is groupings.
00:03This part of model management actually consumes more time than the analysis itself.
00:08It's one of the most crucial parts because it ensures that we can get accurate results from STAAD.
00:13Now press Ctrl-G on your keyboard. A dialog box will appear. Under Select Type, choose Beam.
00:20These groupings will be really helpful later, especially when we get to the loading stage,
00:24because groups can be easily assigned using the command file.
00:28Later on, I'll show you the best way and technique to assign loads using these groups.
00:32Take note, STAAD doesn't allow spaces in group names.
00:36If you want to indicate space, use an underscore.
00:40That's how STAAD recognize a group name.
00:42Now, after we select Beam, we will name each group.
00:46It's important to name each group based on the part of the truss it represents.
00:50This way, you can easily identify which beams are included.
00:53Let's create the following groups.
00:56Underscore purlins.
01:03Underscore trusses.
01:10Underscore BC, or the bottom chord.
01:19Underscore WMV, or the web member vertical.
01:22Underscore WMD, or the web member diagonal.
01:29Underscore TC, or the top chord.
01:38Underscore KP, or the king post.
01:41Now, let's assign these groups one by one by selecting the corresponding beams.
01:49In the Create Group dialog box, select underscore purlins,
01:53then manually select all the purlins in the model.
01:56And here we go.
02:26We still have some tiny members of purlins, and they're still part of the purlin group, so include them.
02:42After selecting all the purlins, make sure the Assign method in the dialog box is set to Associated to Selected
02:49Geometry, then click Associate.
02:52Stodd will confirm that the beam is assigned.
03:01Now in the menu bar, go to the Select menu, then under Beam Category, choose Inverse.
03:11This will select all the remaining truss members.
03:19Click Group underscore Trusses, then click Associate.
03:29Next, we assign the bottom chord.
03:31Highlight the entire truss, then go to New View.
03:34This helps isolate the bottom chord for easier selection.
03:39Switch to an Elevation view.
03:41Any side view that clearly shows the bottom members.
03:49Now select the bottom chord beams, then click Associate to Group underscore BC.
04:04In isolating and assigning other members, here's a good technique.
04:08To make sure we assign each group correctly, we'll use Inverse Selection to isolate ungrouped members.
04:14Then use New View to show only those remaining members.
04:26Go to the Select menu, then under Beam Category, choose Parallel to Y, since vertical members are along the Y
04:33axis.
04:33This will select all vertical web members, but it may include king posts, which we don't want here.
04:38Hold Control and manually unselect each king post.
04:45Now assign the group underscore WMV.
04:59Now we Inverse it again.
05:09And then New View.
05:10And then isolate any side view.
05:13Then select all diagonal members except the king post.
05:24Repeat this from the other side view to select the other diagonal web members.
05:29Once they're all selected, assign the group underscore WMD.
05:42Now use Inverse, then create a new view.
05:51So, the next one is top chord.
05:53Go to Select menu, then Parallel to Y to capture the king post.
05:59Then we Inverse it again to select the top chord.
06:03Now assign it to underscore TC.
06:11Now for king post.
06:12Inverse select again and then assign it to underscore KP.
06:16That's it for the first part of our groupings.
06:19There are more groups we need to assign later, but for now, make sure to save your file before proceeding
06:25to the second part of the groupings for this trust system.
06:28So, let's see.
06:30Let's see.
06:32Let's see.
06:41Let's see.
06:43Let's see.
06:44Let's see.
06:44Let's see.
06:44You
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