model a suspension bridge in RM Bridge V8

Question

Hi everybody. 
 I am trying a suspension bridge in RM Bridge V8 and I model main cable by cable element, but when I calculator seflweight of suspension bridge then it error Node support in node of main cable and I modeling node support have value 1e+10 in CMX, CMY, CMZ, and deflection is very large, So, I hope everybody help me can fix error and l inking cable elements into a unified whole is a soft wire structure. 
 if can, everybody can give me a file RM Bridge to refer, please. 
 I hope reply to every body about my problem. 
 Thank you so much and good luck.

changsu shim · Accepted Answer

Hello, sorry for making a question instead of an answer in your post!! I am making a suspension model in RM bridge also. I have a question on main cable modeling because the "DEMO example" on suspension bridge is locked somehow, I can't open it probably. So how to model the main cable as a "Cables" member? as each cable member need 2 "reference segment"s, start from the stiffening girder, to what member? Even I try to create the 3D points, but still don't know how to generate the cable member from those points?

MarcosBeier · Answer

Hi Dang, 
 If you're creating a full 3D model you might as well need to restrain the rotation DOF's for all cable elements at their begin and end (&phi;x = &phi;y = &phi;z = 1E10) 
 We always indicate to use the latest version of our products, in RM Bridge CONNECT Edition you can find the Suspension bridge model simple example at File\Examples\Demo Examples & FAQ\Suspension Bridge with documentation and datasets. 
 Best regards,

MarcosBeier · Answer

Hi again Dang, 
 We are also very happy to see that you could move FW with your project analysis with our guidance. 
 As in RM Bridge cables have only longitudinal stiffness they need to be constraint against rotation. Therefore, it's commonly accepted that the structural system might need all this boundary conditions. 
 Moreover, due to the highly statically indeterminate and also the nonlinearity of cable sagging it's ok to even include additional girder and main cable to be fixed horizontally. This additional constraint method allows for shape finding of the suspended cable as only very simple cases with an extremely reduced number of cables would converge without this horizontal restraints. 
 Best regards,

model a suspension bridge in RM Bridge V8

Top Replies