CSiBridge for plan curve Bridge

[dplucas]

Hi to all.

CSiBridge have the ability to change a bridge route into curve or straight automatically, just defining the radius and length of arches between two points.
I'm now working with this ability and made 2 models with a concrete box girder with a few spans, one in a curve route (slightly curve in plan) and another straight. For this two models is made the exactly same construction process (with construction scheduler), free cantilever. My objective is to take the vertical displacements for both and compare. I'm obtaining a very different displacements comparing the both models, and as I think, it is not expected so. As you can see in the Annex graphic, the straight route seems OK, with symmetrical displacements. Looking into the curve route, we can find obvious unsymmetrical displacements.

I would like to know if someone as already experienced this "problem" with CSiBridge or if I'm doing some wrong consideration.

Thanks in advance,

 

[Lomarandil]

I don't have the slightest idea about CSiBridge or what your graph is intending to show (well, vertical displacement yes, but what is your x-axis representing?)

That said, as explained in NCHRP report 725, accurately calculating deflections in curved or skewed bridges can be quite difficult and method-dependent.

 

[Shz713]

This feature is newly added to CSIBridge. What I know from Reference Manual of CSI products, when curved shell objects (assuming that's what your deck is made of) are present in bridge modeller, different force internal forces and stresses transitions are experienced. You'd better double check with connectivity of curved area, look for any meshing transitions, or any sort of constraint/restraint.