bridge with a hinge in the middle

[Anonymous]

hello,

I have gonna throught all the relevant topics on the hinge and unfortunately some have been mislead.  like if you want to creat a hinge in the middle of a bridge to reduce the centre bending moment, the factor you need to apply is "release" rather than "non-linear hinge". you should click release the z direction(or whatever coordinate system in your model) rotation "Rz" to apply this hinge.

[Rafacascudo]

Bar releases are always set in local coordinate system.
Normally it will be rotation Ry release you have to assign to get no vertical moments at any bar end

[Anonymous]

hi,

thanks for your notice.

it is the case in a 2 d problem with only x-y, but in a 3-d problem, it would become release Rz in vertical direction.

also, I found release in Rz only available to bars, with respect to shell/panel problem(sometime panel is more convenient to simulate the bridge deck actually), there is only Rx available in the "linear release" section which apply to panel.  this would be a problem if I want to release Rz.

[Rafacascudo]

You need to understand that ,as I said before , bar releases are defined based on the local coordinate system of the bar , which almost always is not coincident with the global coordinate system.

For bars

http://help.autodesk.com/view/RSAPRO/2017/ENU/?guid=GUID-E6C19973-6864-4E67-9659-6F43579E2DB8

For panels

http://help.autodesk.com/view/RSAPRO/2017/ENU/?guid=GUID-6086A5D7-4C1D-49A8-B9E2-9FFF1C3EFACE