How to account for cable snap (cable loss) in a cable stayed bridge analysis using midas civil?

The question from the client is

 “Dear support, For cable stay bridges, please add the ability to check cable loss/replacement for multiple cable loss scenarios in one model.”











The client requestioned as:

 “Dear support,

We do not use time history method as we believe this is too complicated and error-prone for this analysis. We use the static analysis method specified in PTI DC45.I where you run the model without the lost/replaced cable to quantify the effects on the rest of the structure. See the PTI extract adjacent to this cell. We have tried to do it using construction staging; a cable can be deactivated to run the analysis, but then you cannot simply reactivate that element, because the locked in forces in the structure will change. So subsequent cables cannot be checked in the same model.”





The here is “Boundary Change Assignment” option in midas civil.




Creating a strong and a weak link between cable and deck




Now, using “Change general link” option in midas civil which change the link property to weak link from strong link.


Then we define the “Boundary Change Assignment” under “Analysis” tab and will assign the “Change general link” property to the Nodal-load load case (CLDF).


Now we can observe in the second picture the additional cable forces due to cable snap.


Thank You!


Creation date: 2/20/2019 1:43 PM      Updated: 4/21/2023 11:41 AM
Files   
Cable loss-quasi static.mcb
215 KB
DataImage1.png
206 KB
DataImage10.png
211 KB
DataImage11.png
346 KB
DataImage12.png
258 KB
DataImage13.png
403 KB
DataImage15.png
251 KB
DataImage2.png
380 KB
DataImage22.png
222 KB
DataImage22.png
249 KB
DataImage43.png
1 MB
DataImage43[1].png
228 KB
DataImage46.png
411 KB
DataImage50.png
446 KB
DataImage51.png
220 KB
DataImage54.png
271 KB
DataImage57.png
195 KB
DataImage61.png
415 KB
DataImage62.png
232 KB
DataImage65.png
217 KB
DataImage67.png
238 KB
DataImage7.png
169 KB
DataImage72.png
176 KB
DataImage73.png
281 KB
DataImage80.png
279 KB
DataImage81.png
350 KB
DataImage82.png
356 KB
DataImage85.png
236 KB
DataImage87.png
326 KB
DataImage88.png
246 KB
DataImage91.png
215 KB
DataImage91[1].png
192 KB
DataImage92.png
413 KB
DataImage98.png
221 KB
DataImage99.png
1 MB
TH.avi
14 MB