Hi Peter We don't have a tutorial, per say, but I can tell you what I did: I positioned some nodes to form the cross section of the girder, spaced to match the final element size. I then used the Sculpt > Extrude command on the nodes to create the 2D shell elements along the girder length. I also created a number of 2D properties to give the plate thicknesses and assigned them accordingly. For the stiffeners I think that I drew in a large plate and then used the Sculpt commands to split it down to match the girder elements To switch the stiffeners on and off I used an Analysis Stage that excluded the stiffener property number, before running the modal analyses on the whole model and the stage for comparison. I hope that helps Peter
Thanks Peter, I did manage to make a model and it was fairly easy, I initially wasn't sure if the modal buckling mode require some special inputs but it didn't so the beam rolled over and gave me a buckling/strength factor which was pretty cool. I was trying to work out to see if placing two beams side by side and only welding the flanges together at mid span would be enough to improve it's torsional stability significantly. So I just placed two beams side by side with a minimal gap between them and then added in a short 2D element between them at the mid span to represent a plate/weld between the two beams and it seems to have worked. Cheers, Peter
For GSA 10 you need to add a Grid Surface first (this is where you state span two-way). Then the current grid plane may can be set on the Lists toolbar for the view by first setting the Display Option to Current Grid (top right of graphic view). The current grid is then displayed in the Display List and the available grid planes are offered in the drop-down list.
21:24 In GSA 10 'Expand bridge loading' is now under “Model > Bridge Modelling > Expand Bridge Loading”
4:05 Turns on user axis (this is located in the labels tab on the top RHS in GSA 10)
11:05 Starts making dummy nodes at outer edges
5:47 Starts adding nodes.
13:24 Addes self-weight to loading
6:31 Modifies selected elements.
Do you have a tutorial for making that plate model for the steel girder at the end and running some torsional buckling analysis?
Hi Peter
We don't have a tutorial, per say, but I can tell you what I did:
I positioned some nodes to form the cross section of the girder, spaced to match the final element size.
I then used the Sculpt > Extrude command on the nodes to create the 2D shell elements along the girder length.
I also created a number of 2D properties to give the plate thicknesses and assigned them accordingly.
For the stiffeners I think that I drew in a large plate and then used the Sculpt commands to split it down to match the girder elements
To switch the stiffeners on and off I used an Analysis Stage that excluded the stiffener property number, before running the modal analyses on the whole model and the stage for comparison.
I hope that helps
Peter
Thanks Peter,
I did manage to make a model and it was fairly easy, I initially wasn't sure if the modal buckling mode require some special inputs but it didn't so the beam rolled over and gave me a buckling/strength factor which was pretty cool. I was trying to work out to see if placing two beams side by side and only welding the flanges together at mid span would be enough to improve it's torsional stability significantly. So I just placed two beams side by side with a minimal gap between them and then added in a short 2D element between them at the mid span to represent a plate/weld between the two beams and it seems to have worked.
Cheers,
Peter
32:25 Starts Option A - Full Optimisation for EC1/UK/HK/US/AUS Highway Loading
14:14 Runs a static analysis
5:25 Defines current grid
For GSA 10 you need to add a Grid Surface first (this is where you state span two-way). Then the current grid plane may can be set on the Lists toolbar for the view by first setting the Display Option to Current Grid (top right of graphic view). The current grid is then displayed in the Display List and the available grid planes are offered in the drop-down list.
3:15 Defines axis.
26:16 Starts influence points.
12:42 Sets support conditions
how can i model a composite bridge (concrete deck on two steel girders)?
Hi! If you send our customer support team an email explaining what you're hoping to model, they will gladly assist; oasys@arup.com
9:22 Defines Section Properties (T-Beam & Slab)
4:16 Starts defining the grid plane.
27:09 Node effects.
16:32 Combinations and Enveloping
6:49 Defines alignment.
6:23 Joins the 4 nodes together with a line.
19:02 Starts bridge load optimization tutorial.
15:23 Moves onto loading
18:46 Loading - 3 Types
35:54 Envelopes
2:24 Starts Tutorial
24: 00 Starts Method B Lane by lane optimisation for other loads.
24:00
Very useful stuff
18:36 3 Methods.