I came across these issues while trying to export models from OBM to LBC and LBS.
1- When I send a skewed prestressed concrete bridge with the back of abutment as reference line to LBC, the transferred model will end up having flared beams and wrong beam lengths. Is there a reason for that?
2- If I have a multi-unit bridge made of steel I-girder, it seems that I can only send one unit at a time to LBS. Is there a way to send all the units at the same time? What would be the workflow to design piers that are connecting those units?
Would sending the model to RM Bridge would solve these issues?
As far as #2, if you have a bridge that is all steel just create it as a single "OBM" unit. I put that in quotes because the real world bridge term "Unit" and the OBM term "unit" can mean different things. Until we have the ability to model deck joints, i typically put an entire bridge type in a single "OBM" unit, and define the different girder units with different framing plans. This allows you to transfer your entire bridge with all of its units to a single analytical file. I basically look at the OBM term unit as "bridge type". Hope this helps.
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Thank you for your explanation. In my model, a unit is a group of continuous spans so that the bridge would have multiple units. If I follow your suggestion, will LBS be able to analyze and design simple and continuous spans in the same model?
The only ones i've ever done in OBM/LBS are real world single units (1-3 span units). I haven't had a bridge yet with multiple read world units that i tried to export from OBM to LBS as a single OBM unit. You'll have to test it out and try. I believe it will though.
Thank you